GeekOn Discussion:Local Disk vs ‘The SAN’          for      VDI Storage   Ron Oglesby @ronoglesby #GeekOn
Agenda Who cares about this session anyway?   Why is disk so important in VDI?   What are the key concepts to understan...
Disk for Desktops? Who cares? How many disks does it take to support   25 desktops?
Disk IO Understanding LimitationsSome References!http://www.techrepublic.com/blog/datacenter/calculate-iops-in-a-storage-a...
Desktop IO Requirements? Read:Write ratio can be as high as 50:50   60:40 to 70:30 is typical Light Users = 4-5 IOps M...
Boot/Login Storms At boot and login IO can be extreme   Even a medium user can generate 90-100 IO at login (why is   tha...
Disk Costs and VDI Dell 143 GB SAS 15K SAS Drive = $ Dell 100 GB SSD Drive =$$ EqualLogic SAS drives $$ EqualLogic SAT...
Local Storage is the Solution       to this Problem
Local Storage Start with these questions:   How many of you boot your normal desktops from   the SAN?   How many of you...
Why do people talk down local DAS Storage companies make a lot of money selling   centralized disk and the software aroun...
Local Storage is about Perf vs Cost Dell PCs can cost as little as $350! Performance requirements require High end disk...
That’s ALL BSSAN is the Solution to this         Problem       Local Storage is too limiting
Things this guy isnt telling you! HA, DRS, FT, E-I, E-I –OH…. Not available with local  disk! You might not even have en...
All the features you love… Do I really need to detail them all? HA DRS FT SRM Storage vMotion Etc Etc
Spindle Count??? 50 users per server at 20 IO each= 1000   Iops 100 users/server @ 10… Boot / Login Storms? RAID Penal...
“Cheap” SSD Issues So you move to SSD instead of rotating disk… $$$$ 149 GB SSD on Dell 610 $4,599.00 $$ 100 GB SSD on ...
Handle the IO with mixed disks Leverage Hybrid Arrays   EqualLogic XVS   EMC FAST Systems SSD / EFD can be used for HO...
What about that whole Dynamic Cloud? Data Tiering   About placing data on the type of disk it NEEDS. Not fixed   provisi...
So what does Unidesk think? We don’t care…. So what to we do?
 roglesby@unidesk.com @ronoglesbyCopyright © 2010 Unidesk Corporation. All Rights Reserved. www.unidesk.com
Open Q&A
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Get Your GeekOn With Ron - Session Two: Local Storage vs Centralized Storage Models

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Join virtualization expert and industry veteran Ron Oglesby as he discusses local storage vs centralized storage models for VDI, including the arguments for and against local storage in VDI environments, a review of converged platform models (ie Nutanix) for VDI, and SSD tips and tricks

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Get Your GeekOn With Ron - Session Two: Local Storage vs Centralized Storage Models

  1. 1. GeekOn Discussion:Local Disk vs ‘The SAN’ for VDI Storage Ron Oglesby @ronoglesby #GeekOn
  2. 2. Agenda Who cares about this session anyway?  Why is disk so important in VDI?  What are the key concepts to understand about VDI and Storage Then…  Why Local Storage rules for VDI  Why Local Storage Blows and You should ONLY use SAN storage for VDI
  3. 3. Disk for Desktops? Who cares? How many disks does it take to support 25 desktops?
  4. 4. Disk IO Understanding LimitationsSome References!http://www.techrepublic.com/blog/datacenter/calculate-iops-in-a-storage-array/2182http://www.yellow-bricks.com/2009/12/23/iops/
  5. 5. Desktop IO Requirements? Read:Write ratio can be as high as 50:50  60:40 to 70:30 is typical Light Users = 4-5 IOps Medium Users = 8-10 IOps Heavy Users = 14-20 IOps So if you have 50 medium users 400-500 Sustained IOps So if you have 75 users/server? 750 IO? 4 disks before RAID penalty?! 8-10 or more after penalty? But what about boot / login storms?
  6. 6. Boot/Login Storms At boot and login IO can be extreme  Even a medium user can generate 90-100 IO at login (why is that 100 IO a ‘magic’ number?)  Boot storms can be even worse The “good” thing about a boot storm is that it is typically 90% Read!  No RAID penalty  Caching Helps Still must be planned for.
  7. 7. Disk Costs and VDI Dell 143 GB SAS 15K SAS Drive = $ Dell 100 GB SSD Drive =$$ EqualLogic SAS drives $$ EqualLogic SATA drives = $ EqualLogic SSD drives= $$$ Windows 7 “Thick Provisioned” 20-35GB Windows 7 Linked-Clone = 8-10GB
  8. 8. Local Storage is the Solution to this Problem
  9. 9. Local Storage Start with these questions:  How many of you boot your normal desktops from the SAN?  How many of you boot your terminal servers from the SAN?  How many of you have an extremely short SLA on recovering your desktops?
  10. 10. Why do people talk down local DAS Storage companies make a lot of money selling centralized disk and the software around it. More power to them! Hypervisor’s “BIG” features require centralized storage- helps push all that higher end licensing Tools supplied by hypervisor vendors don’t work without centralized storage.Copyright © 2010 Unidesk Corporation. All Rights Reserved. www.unidesk.com
  11. 11. Local Storage is about Perf vs Cost Dell PCs can cost as little as $350! Performance requirements require High end disk Writable GB cost local vs SAN (SAS 15k)  RAID 1 143GB Drives $5/GB – SAN 15K $10-30/GB Writable GB cost local vs SAN (SSD)  RAID 1 143GB Drives $5/GB – SAN SSD $30-70/GB Why pay for centralized storage for a desktop?!
  12. 12. That’s ALL BSSAN is the Solution to this Problem Local Storage is too limiting
  13. 13. Things this guy isnt telling you! HA, DRS, FT, E-I, E-I –OH…. Not available with local disk! You might not even have enough spindles! Local/CHEAP SSD isnt that great. IO can be handle cost effectively on the SAN Storage Tiering/Data movement all but impossible with local disk Dynamic Capacity/Cloud? Not happening with local disk.Copyright © 2010 Unidesk Corporation. All Rights Reserved. www.unidesk.com
  14. 14. All the features you love… Do I really need to detail them all? HA DRS FT SRM Storage vMotion Etc Etc
  15. 15. Spindle Count??? 50 users per server at 20 IO each= 1000 Iops 100 users/server @ 10… Boot / Login Storms? RAID Penalty for writes? DL 360’s have 6 drive bays. 15K drives at 180 IO each  1080 IOps before RAID penalty? Are you a Blade shop? Probably wont even get enough spindles in a server
  16. 16. “Cheap” SSD Issues So you move to SSD instead of rotating disk… $$$$ 149 GB SSD on Dell 610 $4,599.00 $$ 100 GB SSD on Dell 610 $1,949.00 Compare to 146GB at $359 on the same server. Can you even get enough writable space on those SSD? Better to use SSD for just hot data rather than all data
  17. 17. Handle the IO with mixed disks Leverage Hybrid Arrays  EqualLogic XVS  EMC FAST Systems SSD / EFD can be used for HOT data Smart systems will MOVE the data Can also be used for writes!
  18. 18. What about that whole Dynamic Cloud? Data Tiering  About placing data on the type of disk it NEEDS. Not fixed provisioning  Moving data from slow, to fast to REALLY fast disks  Only moving small parts of data not whole VMDKs?!?! Elasticity in the VM environment  Dynamic increases/decreases in capacity  Provisioning times increase – sometimes dramatically  Recovery and flexibility in the toilet
  19. 19. So what does Unidesk think? We don’t care…. So what to we do?
  20. 20.  roglesby@unidesk.com @ronoglesbyCopyright © 2010 Unidesk Corporation. All Rights Reserved. www.unidesk.com
  21. 21. Open Q&A

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