Closing The Virtual IO Management Gap


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Teneja Group report highlighting the need for performance management solutions that guarantee service assurance and delivery in the data center. This report illustrates that while virtualization has brought many benefits and changed the nature of how we host applications; it has also brought to light "a critical gap for IO and storage." The report stresses the need for increased visibility into the physical infrastructure and how Virtual Instruments can assure the success of virtualizing mission critical applications.

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Closing The Virtual IO Management Gap

  1. 1.   TECHNOLOGY  BRIEF   CLOSING  THE  VIRTUAL  IO  MANAGEMENT  GAP   Assuring  Service  Throughout  the  Data  Center  with                                                     Infrastructure  Performance  Management   AUGUST  2012   There  is  a  significant  and  potentially  costly  management  gap  in  virtualized  server   environments   that   rely   solely   on   hypervisor-­‐centric   solutions.   As   organizations   virtualize  more  of  their  mission-­‐critical  applications,  they  are  discovering  that  the   virtual   versions   of   these   apps   continue   to   depend   on   the   rock-­‐solid   storage   availability   and   top-­‐notch   IO   performance   they   had   when   physically   hosted.   Assuring   great   service   to   virtualized   clients   still   requires   deep   performance  management   capabilities   along   the   whole   IO   infrastructure   path   down   to   and   including   shared  storage  resources.  Cohesive   hypervisor   management   solutions   like   VMware’s   vCenter   Operations   Management   Suite  provide   a   significant   advantage   to   virtual   administration   by   centralizing   and   simplifying   many  traditionally  disparate  management  tasks.  However,  there  is  a  significant  management  blind  spot  in  the  view  of  end-­‐to-­‐end  IO  infrastructure  when  looking  at  it  from  the  native  virtual  server  perspective.  Enterprises   relying   more   and   more   on   virtualized   IT   delivery   need   to   address   this   natural  management   gap   with   Infrastructure   Performance   Management   (IPM).   A   lack   of   robust   IPM   will  degrade  or  even  prevent  the  deployment  of  critical  applications  into  a  virtual  environment  –  at  best  losing   out   on   the   benefits   of   virtualization   and   the   opportunities   for   cloud,   at   worst   causing   severe  degradation  and  service  outages  for  all  applications  sharing  the  same  virtual  infrastructure  pools.  In   this   paper   we   review   the   virtual   performance   management   landscape   and   the   management  strengths  of  the  most  well-­‐known  hypervisor  management  solution  –  VMware’s  vCenter  Operations  Suite  -­‐  to  understand  why  both  the  market  perception  and  resulting  admin  reliance  on  it  is  so  high.  We   look   at   how   that   reliance   overlooks   a   critical   gap   for   IO   and   storage,   and   what   the   implications   of  that   blind   spot   are   for   ensuring   total   performance.   Finally,   we   examine   how   the   unique   IO-­‐centric  capabilities   of   Virtual   Instruments’   VirtualWisdom   close   that   gap   by   correlating   complete   IO   path  monitoring   with   both   physical   and   virtual   infrastructure,   and   how   by   using   VirtualWisdom   with  vCenter   Ops   one   can   achieve   a   complete   end-­‐to-­‐end   picture   that   enables   mission-­‐critical   applications  to  be  successfully  virtualized.  VIRTUALIZED  INFRASTRUCTURE  MANAGEMENT  VMware   management   at   the   enterprise   level   today   centers   around   VMware’s   own   vCenter   suite   of  solutions.   VMware   vCenter   provides   a   myriad   of   advanced   management   functionality   all   within   its  much-­‐desired  “single  pane  of  glass”  for  the  virtual  administrator.  While  vCenter  does  not  preclude  the  use   of   other   traditional   system   management   solutions,   and   in   fact   provides   API’s   to   enable   key  hypervisor   statistics   used   by   almost   every   third   party   solution   today,   the   trend   for   virtual  administrators  is  to  rely  more  and  more  on  directly  integrated  vCenter  facilities.      VMware  vCenter  is  built  into  and  integrates  intimately  with  the  vSphere  platform,  the  hypervisor  that  virtualizes  server,  network,  and  storage  resources  in  order  to  host  “virtual  machines”.  This  not  only  gives   VMware   a   huge   advantage   in   creating   virtualization   management   solutions,   but   also   enables  Copyright  The  TANEJA  Group,  Inc.  2012.  All  Rights  Reserved.   1  of  7  87  Elm  Street,  Suite  900    Hopkinton,  MA    01748    T:  508.435.2556    F:  508.435.2557      
  2. 2.   Technology  Brief  them   to   provide   significant   customer   value   for   the   virtual   admin   in   the   form   of   a   simplified,  centralized,  and  “homogenized”  management  experience.    Traditionally   a   large   enterprise   would   be   staffed   with   system   management   experts   in   many   domains.  Each  set  of  experts  could  be  found  working  in  isolated  silos  of  management  technology  with  unique  IT  processes.  In  deploying  virtualization  an  organization  is  hoping  to  deliver  better  service  at  lower  cost.  This  usually  means  that  they  hope  to  run  the  virtualized  environment  on  the  leaner  side  of  the  budget,   leveraging   optimally   minimized   infrastructure   and   staffing.   With   this   approach,   the   virtual  admin   comes   naturally   to   own   a   wider   swath   of   system   management   responsibilities,   and   the   most  effective  accomplishment  of  that  is  through  the  convergence  and  automation  of  formerly  siloed  tasks.    Virtualization  adoption  and  the  intelligent  management  of  virtualized  infrastructure  therefore  break  down  the  silo  walls  of  old  school  IT  management.  VMware  provides  IT  management  solutions  across  broad  categories  it  defines  as  Infrastructure  and  Operations  Management,  IT  Business  Management,  End  User  Computing,  and  Application  Management.  This  aggressively  wide  swath  of  IT  management  is  all  brought  within  the  reach  of  the  virtual  administrator  “generalist,”  and  naturally  these  solutions  are   focused   on   centralizing   management   and   operations   at   the   hypervisor   or   “server-­‐centric”   level.  For  example,  within  Infrastructure  and  Operations  Management  the  vCenter  Operations  suite  brings  together  the  performance,  capacity,  and  configuration  management  of  virtual  server  hosts  and  guest  machines  into  a  single  management  solution.  Virtual  Performance  Management  with  vCenter  Operations  VMware   vCenter   Operations   Management   provides   advanced   features   and   capabilities   for   virtual  infrastructure  performance,  configuration  and  capacity  management,  with  tight  integrations  available  for  supporting  activities  like  application  dependency  mapping,  configuration  change  correlation  and  cost-­‐based   optimization.   The   main   design   of   vCenter   Operations   supports   two   core   management  processes:   1. Ensuring   and   restoring   service   levels   by   monitoring,   identifying   and   remediating   performance  problems   2. Optimizing   for   efficiency   (capacity/cost)   by   planning   and   orchestrating   improvements   in   allocations  or  constraints  The   primary   source   of   data   for   vCenter   comes   from   VMware’s   hypervisor   vSphere.   This   server  virtualization   layer   produces   key   metrics   about   “actual”   guest   utilizations   and   real   server   resource  consumption.  At  the  same  time,  virtualization  by  its  very  nature  creates  abstraction  that  introduces  cross-­‐domain   management   challenges.   A   virtual   server-­‐centric   perspective   by   definition   does   not  provide   a   complete   end-­‐to-­‐end   picture   across   the   entire   IT   infrastructure   of   the   factors   that  contribute  to  an  application’s   total  availability  and  performance.  For  example,  vCenter  Ops  by  itself  can’t   see   into   or   manage   IO   down   its   complete   path   through   the   SAN   fabric   and   into   and   out   of   an  external  storage  array.  vCenter  Operations  Across  IT  Domains  When  virtual  machines  need  to  interact  with  high-­‐performance  network  and  storage  resources  that  aren’t   directly   converged   into   the   virtual   server,   inevitably   cross-­‐domain   management   becomes   a  challenge   –   especially   when   trying   to   solve   insidious   performance   degradation.   Solving   cross-­‐domain  performance   challenges   requires   monitoring   and   correlating   information   across   virtual   server  clients,  hosts  and  the  specific  external  resources  involved.  To  address  this,  vCenter  provides  two  main  approaches.    First,  vCenter  functions  as  an  expandable  platform.  There  is  an  active  ecosystem  of  third  party  system  management   solutions   that   can   plug   in.   The   vast   majority   of   vCenter   Operations   plug-­‐ins   provide  Copyright  The  TANEJA  Group,  Inc.  2012.  All  Rights  Reserved.   2  of  7  87  Elm  Street,  Suite  900    Hopkinton,  MA    01748    T:  508.435.2556    F:  508.435.2557      
  3. 3.   Technology  Brief  vendor-­‐specific   hardware   management   information   that   enables   high-­‐level   remote   operations   by   the  generalist   virtual   admin.   However,   these   operational   plug-­‐ins   are   not   usually   provided   with   deep-­‐dive  expert  capabilities  to  optimize  external  high-­‐performance  infrastructure,  nor  with  more  general  “system-­‐spanning”   capabilities   to   correlate   all   the   information   needed   to   diagnose   cross-­‐domain  issues  or  optimize  across  heterogeneous  infrastructure  pools.  For   example,   a   storage   vendor’s   array   management   plug-­‐in   for   vCenter   Ops   might   provide   health  statistics   by   array   object   and   offer   vendor-­‐specific   array   operational   management   (e.g.   volume  creation,  power-­‐on/off).  For  each  type  of  storage  there  will  be  a  different  plug-­‐in  creating  a  type  of  tool   sprawl   for   the   admin   regardless   of   the   “single   pane   of   glass”   platform.   While   the   best   of   these  tools   might   attempt   to   connect   all   the   IO   dots,   so   to   speak,   the   necessarily   incomplete   and   vendor-­‐specific   perspectives   can   actually   hide   deep   IO   path   problems   that   stem   from   both   contention  (demand-­‐side)   and   degradation   (supply-­‐side).   Worse,   the   information   from   each   plug-­‐in   is   likely  vendor-­‐specific  in  both  form  and  function,  and  uncorrelatable  with  each  other  (e.g.  how  IOP  latency  is  defined  or  measured).  Second,   VMware’s   VASA   API   is   an   attempt   to   capture   and   incorporate   arbitrary   storage   array   data  directly   by   encouraging   third   party   storage   vendors   to   publish   “up”   into   this   API.   But   the   implicit  mandate   that   other   domains   push   all   relevant   management   data   up   into   the   hypervisor,   while  certainly   aligned   with   the   ultimate   efficiency   goals   of   server   virtualization   efforts,   is   an   uphill   and  inevitably   incomplete   strategy.   And   even   if   accomplished,   the   necessary   abstraction   and   domain  simplification   at   the   hypervisor   level   may   actually   make   it   harder   to   figure   out   what   is   actually  happening  in  the  supporting  infrastructure.  THE  PERILOUS  IO  MANAGEMENT  GAP  Today   there   is   extreme   pressure   on   many   IT   shops   to   continue   virtualizing   deeper   into   their  application   portfolios   in   order   to   continue   reaping   cost   reduction,   efficiency,   and   improved   service  delivery   benefits.   However,   there   is   a   difficult   “line   in   the   sand”   to   cross   when   the   time   comes   to  virtualize   storage-­‐intensive   mission   critical   applications.   Corporate   email,   core   business   databases,  and   operational   data   analysis   (BI   and/or   new   Big   Data   based)   all   require   intensive   IO   service  regardless  of  whether  they  are  hosted  on  physical  or  virtual  servers.  IT  has  to  commit  to  managing  availability   and   performance   as   tightly   as   if   those   apps   were   still   physically   hosted   directly   on  dedicated  hardware,  including  high-­‐performance  enterprise  storage.     But   unlike   in   a   dedicated   infrastructure   where   troubleshooting   or   optimization   can   be   conducted   by   serially   analyzing   directly   connected   resources,   the   very   nature   of   virtualization   implies   that   its   supporting   infrastructure   is   shared   indirectly   and   dynamically.   This   increased   management   complexity   becomes   more   difficult   when   the   shared   infrastructure   is   not   directly   controlled   by   the   virtualization   hypervisor,  as  is  the  case  with  external   storage  array  networks  (as  opposed  to   CPU  and  memory  resources).  From  the   server   perspective,   IO   is   abstractly     handed  off  to  external  “storage”  at  the   network   adapter   (e.g.   a   hardware   bus   Figure  1.  IO  Path  Visibility  from  the  Hypervisor  Perspective   adapter   or   HBA).   Because   of   that    Copyright  The  TANEJA  Group,  Inc.  2012.  All  Rights  Reserved.   3  of  7  87  Elm  Street,  Suite  900    Hopkinton,  MA    01748    T:  508.435.2556    F:  508.435.2557      
  4. 4.   Technology  Brief  storage   service   abstraction   layer,   the   native   server   viewpoint   is   effectively   storage   blind   and   can’t  provide   insight   into   problems   with   IO   path   contention,   fabric   and   array   misconfiguration,   or  networking  and  physical  cabling  issues.  Managing  virtual  infrastructure   performance  becomes  even  more  challenging  when  storage  is  shared  outside   of   a   single   virtualization   “domain”   –   perhaps   with   other   virtualization   clusters   or   physical  servers   that   can   contend   for   bandwidth   and   IOPS.   Organizations   tend   to   make   optimal   use   of  expensive  SAN  investments  by  leveraging  them  widely,  introducing  contending  IO  traffic  outside  the  purview  of  hypervisor-­‐centric  management.  Today,  high-­‐performance  IO  in  organizations  that  have  (or  had!)  IT  storage  specialists  is  commonly  delivered  through  Fibre  Channel  attached  storage  arrays.  For  mission-­‐critical  applications,  the  lack  of  vm-­‐to-­‐array  IO  awareness  and  visibility  in  virtual  infrastructures  running  over  Fibre  Channel  can  be  risky,   especially   if   the   virtual   admin   has   taken   on   responsibility   for   both   servers   and   storage.   With  only   hypervisor-­‐centric   views,   admins   can’t   spot   or   diagnose   IO   problems   until   after   it   is   too   late   –  when  service  levels  have  already  degraded  and  impacted  business  performance.  Bridging  the  IO  Management  Gap  Whoever  is  responsible  for  storage  needs  the  proper  tools  and  information  to  optimize  capacity  and  performance,   implement   data   protection,   and   leverage   other   advanced   storage   capabilities.   In  particular,  storage-­‐related  IPM  tasks  including  the  following  need  to  be  supported:  • Manage  storage  tiering  to  balance  capacity  usage  with  performance  (e.g.  optimize  investment)  • Analyze  and  optimize  performance  under  changes  (e.g.  assure  service  levels)  • Validate  and  tune  data  protection  and  DR  capabilities  like  remote  replication  • Set  and  tune  storage  network  parameters  (e.g.  HBA  queue  depths)  • Alert  and  remediate  faults,  misconfigurations,  and  contention/degradation    While   IO   path   blindness   in   virtual   server   environments   makes   it   difficult   if   not   impossible   to   conduct  satisfactory   storage   performance   management,   as   discussed   earlier   there   are   efforts   to   fill   in   some   of  the  storage  picture  at  the  hypervisor  level  (e.g.  like  VMware’s  VASA).  This  high  level  information  may  help   sort   out   the   finger   pointing   where   performance   issues   are   occurring,   but   if   the   issues   are   in  storage,  it  is  unlikely  to  help  solve  them.  As  virtual  environments  grow  and  the  number  of  vm’s  sharing  a  storage  resource  climbs,  aggregate  storage   metrics   at   the   hypervisor   become   increasingly   less   useful.   Aggregate   IO   statistics   across   a  growing  cluster  of  vm’s  looks  increasingly  random,  obliterating  attempts  to  simply  identify  much  less  de-­‐conflict  or  optimize  storage  to  align  with  actual  vm  IO  patterns.  At  the  same  time,  isolating  IO  path  issues  becomes  harder  as  there  are  fewer  obvious  high-­‐level  clues  as  to  which  vm  is  really  doing  what  in  the  storage  infrastructure.  Effective   storage   performance   management   in   virtualized   server   environments   requires   highly  granular  IO  data,  drillable  down  to  tracking  each  IO  operation  across  the  SAN.  The  most  timely  and  ultimately  successful  troubleshooting  relies  on  directly  analyzing  actual  IO  “conversations”  between  a  particular   vm   and   the   storage   array.   And   optimization   tasks   can   require   capturing   and   analyzing   a  significant   amount   of   historical   conversation   data.   This   kind   of   IO   detail   and   history   is   simply   not  available  in  native  hypervisor  management  solutions.    To   really   understand   what   the   default   hypervisor   management   is   missing   in   the   storage   IPM   gap,  we’ll   look   next   at   one   of   the   most   unique   IO-­‐centric   management   solutions   for   virtualization   and  examine  what  it  does  differently.  Copyright  The  TANEJA  Group,  Inc.  2012.  All  Rights  Reserved.   4  of  7  87  Elm  Street,  Suite  900    Hopkinton,  MA    01748    T:  508.435.2556    F:  508.435.2557      
  5. 5.   Technology  Brief  INSIDER  INTELLIGENCE  WITH  VIRTUALWISDOM  Virtual  Instruments  produces  a  unique,  complete  IO  path  performance  management  solution  for  high-­‐performance   Fibre   Channel   storage.   The   VirtualWisdom   platform   covers   the   whole   IO   path   by  collecting  data  from  SAN  switches  and  vSphere  API’s  and  then  combining  it  with  detailed  low-­‐level  IO  transaction   data   captured   with   its   physical   SAN   performance   probe.   By   correlating   every   SCSI   IO  transaction   with   virtual   hypervisor   stats,   VirtualWisdom   produces   “insider”   infrastructure  intelligence  that  enables  effective  storage  IPM.  VirtualWisdom  captures  all  SCSI  SAN  traffic  by  leveraging  the  Virtual  Instruments  optical  TAP  patch  panel,   which   passively   produces   a   copy   of   all   Fibre   Channel   frame   headers.   This   complete   capture  enables   detailed   real-­‐time   monitoring   and   full   forensic   analysis   without   relying   on   averages,  sampling,   approximate   models,   or   “imputed”   views.   By   capturing   traffic   at   the   frame   level,   all  transmission   errors   and   any   performance   degradation   can   be   found   in   real-­‐time   –   and   directly  identified   to   specific   server-­‐to-­‐volume   IO   conversations.   Many   performance   management   solutions  work   with   averages   over   polling   intervals   (e.g.   vCenter   Ops),   but   the   benefits   of   performance  management   improve   drastically   when   outliers   can   be   identified   for   remediation   and   specific   IO  conversations  isolated  for  analysis.  VirtualWisdom’s   complete,   continuous   real-­‐time   monitoring   of   storage   is   independent   of   vendor  hardware,   software,   or   API   versions.   Because   it’s   passively   collected   from   an   optical   tap,   it’s   non-­‐disruptive   to   the   IO   itself   and   can’t  impact   or   degrade   performance   (un-­‐ Application   versus   Infrastructure   Performance  like   agent-­‐based   performance   man-­‐ Management  in  a  Virtualized  Environment  agement  solutions).       Infrastructure   Performance   Management   (IPM)   assures  In   addition   to   the   expected   volume   service   across   all   the   physical   resource   pools   and   the  throughput   and   bandwidth   virtualization   management   that   dynamically   shares   them  measures,   VirtualWisdom   supports   out   to   client   users   and   applications.   Application  expert   performance   analysis   by   Performance   Management   (APM)   focuses   on   how   well  producing   the   most   relevant   applications  are  architected,  coded,  deployed  and  delivered.  performance   metric   –   response   Note   how   the   server   virtualization   layer   nicely   separates  time,   which   is   a   measure   of   latency   client  applications  from   the  infrastructure.  Accordingly,  it’s  (both   time   to   first   data   and   total   natural  for  the  virtual  admin  to  become  responsible  for  IPM  IOP).   Performance   “proxies”   like   -­‐   managing   the   performance   of   all   the   infrastructure   that  capacity,   utilization,   throughput,   or   sums   up   to   the   service   delivered   to   virtual   infrastructure  bandwidth   metrics   such   as   IOPS   and   clients.  MB/s   do   not   directly   measure   IO  latency   and   are   difficult   to   use   in  identifying   performance   problems  or   optimizing   parameters   (although  many   purported   performance  management  solutions  rely  on  them  as   such).   VirtualWisdom   enables  focusing   on   actual   performance  problems   and   optimizing   explicit   IO  performance   by   leveraging   its  response   time   metric   for   the   storage  infrastructure   (referred   to   as  infrastructure  response  time).    Overall,   these   capabilities   provide  the  virtual  admin  with  the  most  im-­‐ Figure  2.  Performance  Management  In  a  Virtualized  Environment  portant   infrastructure   performance  Copyright  The  TANEJA  Group,  Inc.  2012.  All  Rights  Reserved.   5  of  7  87  Elm  Street,  Suite  900    Hopkinton,  MA    01748    T:  508.435.2556    F:  508.435.2557      
  6. 6.   Technology  Brief  insight  –  correlating  what  is  happening  in  storage  with  what’s  going  on  in  the  virtual  server.  The  vir-­‐tual  admin  no  longer  has  an  IO  path  blind  spot  as  storage  performance  is  directly  correlated  end-­‐to-­‐end   from   vm   to   LUN.   Storage   IPM   is   fully   supported   with   accurate   and   relevant   performance   metrics,    enabling  fast  root  cause  analysis  for  any  errors  or  degradation  in  the  IO  path  downstream  from  any  vm.    Complete  Virtualization  Performance  Management  To   avoid   the   perilous   IO   management   gap,   effective   infrastructure   performance   management  requires   full   cross-­‐domain   coverage   over   both   servers   and   storage.   An   ideal   solution   for   virtual  admins   looking   to   deploy   IO-­‐sensitive   mission-­‐critical   applications   would   be   to   combine   vCenter   Ops  with  VirtualWisdom.  VirtualWisdom  can  augment  the  server-­‐centric  view  and  day-­‐to-­‐day  operations  of   vCenter   with   complete   IO   path   visibility   to   enable   the   full   spectrum   of   management   required   to  deliver  consistent,  world-­‐class  performance.    In   addition   to   the   more   tactical   IPM   activities   previously   discussed,   a   combined   solution   supports  driving   valuable   system   level   optimizations.   Performance   assuring   architectural   evolution   and  purchasing   trade-­‐off   decisions   can   be   intelligently   planned   while   vm   densities   and   resource  utilizations  can  be  driven  higher.  Optimal  storage  tiering  decisions  can  be  made  at  the  vm,  server,  and  storage   levels   to   balance   growing   storage   demands   with   performance   requirements.   And   insidious  performance   contention   resulting   from   the   enterprise   sharing   of   resources   across   physical   and  virtual  machines  can  be  identified  or  avoided  altogether.  With  the  right  performance  management  solution  in  place  that  supports  both  virtualized  server  and  SAN,  organizations  can  safely  virtualize  their   mission-­‐critical   applications   and  increase   their   effective  overall   infrastructure   utilization.   Virtual   Instruments   VirtualWisdom   in   conjunction   with   VMware  vCenter   presents   a   solution   that   spans   servers   and   Fibre   Channel   attached   storage,   providing   an  unrivaled   level   of   robust   and   detailed   analysis   of   the   complete   infrastructure,   helping   the   virtual  admin  guarantee  superior  service  levels.  TANEJA  GROUP  OPINION  Expert   performance   management   is   key   to   successfully   hosting   mission-­‐critical   applications   in   any  environment,   but   the   challenges   multiply   under   virtualization.   Virtualization   provides   beneficial  logical   separation   between   layers   of   infrastructure,   but   those   same   abstractions   make   it   difficult   to  manage   system   performance.   While   application   performance   solutions   need   only   examine   the  delivered   experience   from   the   user   or   app   perspective,   effective   infrastructure   performance  management  solutions  must  span  multiple  layers  of  virtualization  to  map  performance  dependencies.  In   order   to   guarantee   performance   and   availability   service   levels   to   clients,   the   virtual   admin   must  obtain  visibility  down  the  IO  paths  as  used  by  each  virtual  machine.  Having   to   implement   infrastructure   performance   management   should   not   be   seen   as   a   burden.  High-­‐performance  storage  resources  are  relatively  expensive  investments,  especially  at  scale.  Performance  management   can   provide   a   large   ROI   derived   not   just   from   avoiding   downtime   or   assuring   service  levels,  but  from  cost-­‐saving  resource  optimization  activities.  Best  practice  performance  management  has  proven  to  significantly  lower  the  TCO  of  deployed  storage  by  driving  out  misuse,  misalignment,  and   misconfiguration.   These   expected   TCO   savings   should   make   it   easy   to   cost-­‐justify   putting   all   top-­‐tier  storage  behind  VirtualWisdom  TAPS  from  day  1.    Regardless   of   expected   ROI,   smart   CIO’s   should   take   a   proactive   approach   rather   than   waiting   for  motivation   from   a   service-­‐killing   performance   issue   or   outage.   Many   enterprises   are   now   building  private   cloud   tiers   of   service   for   mission-­‐critical   apps   that   come   with   strict   availability   and  performance   SLAs.   These   tiers   are   deliberately   architected   for   performance   management   with  thoroughly  instrumented  infrastructure  designed  to  guarantee  world-­‐class  service.  Copyright  The  TANEJA  Group,  Inc.  2012.  All  Rights  Reserved.   6  of  7  87  Elm  Street,  Suite  900    Hopkinton,  MA    01748    T:  508.435.2556    F:  508.435.2557      
  7. 7.   Technology  Brief  Bottom-­‐line,   virtual   admins   need   to   augment   their   hypervisor   management   solutions   to   achieve  complete,   cross-­‐domain   infrastructure   performance   coverage.   While   this   is   especially   true   to   support  mission-­‐critical   applications   that   require   high   IO   service   levels,   it’s   also   increasingly   true   for   growing  VDI  deployments  and  the  increasing  vm  densities  found  in  more  cloud-­‐like  delivery  models.    .NOTICE:  The  information  and  product  recommendations  made  by  the  TANEJA  GROUP  are  based  upon  public  infor-­‐mation  and  sources  and  may  also  include  personal  opinions  both  of  the  TANEJA  GROUP  and  others,  all  of  which  we  believe   to   be   accurate   and   reliable.   However,   as   market   conditions   change   and   not   within   our   control,   the   infor-­‐mation  and  recommendations  are  made  without  warranty  of  any  kind.  All  product  names  used  and  mentioned  here-­‐in  are  the  trademarks  of  their  respective  owners.  The  TANEJA  GROUP,  Inc.  assumes  no  responsibility  or  liability  for  any  damages  whatsoever  (including  incidental,  consequential  or  otherwise),  caused  by  your  use  of,  or  reliance  upon,  the  information  and  recommendations  presented  herein,  nor  for  any  inadvertent  errors  that  may  appear  in  this  doc-­‐ument.  Copyright  The  TANEJA  Group,  Inc.  2012.  All  Rights  Reserved.   7  of  7  87  Elm  Street,  Suite  900    Hopkinton,  MA    01748    T:  508.435.2556    F:  508.435.2557