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How to Fail at VDI
1.
Welcome BriForum
| © TechTarget
2.
How to Fail
at VDI Dan Brinkmann @dbrinkmann blog.danbrinkmann.com Solutions Architect, VMware vExpert Lewan & Associates (Denver, CO) BriForum | © TechTarget
3.
“What business problem
are we solving?” BriForum | © TechTarget
4.
Business/Expectation VDI Failures ●
No business problem ● Desktop virtualization is not server virtualization ● Saving money ● Project in the hands of the vSphere administrator ● No success criteria ● Assume you know what users do ● The same or better experience remotely as locally BriForum | © TechTarget 4
5.
Agenda To understand what
causes VDI failures ● Compute ● Storage ● Guessing BriForum | © TechTarget 5
6.
How to Fail
at VDI The technology failure points ● Test with 5 users ● Using vendor provided users/core sizing ● Using vendor provided IOPs estimates ● Ignore anti-virus ● Ignore user profile management ● Use existing desktop images for physcial PC’s ● Guess BriForum | © TechTarget 6
7.
Compute It’s magic until
it stops working ● Multi-threaded apps ● Latency sensitive workloads ● Hyperthreading ● Latency = Health BriForum | © TechTarget 7
8.
Compute CPU scheduler in
vSphere ● CPU scheduler in vSphere is entitlement/consumption based, not priority (unlike Windows) ● There is no priority in the CPU scheduler ● Given equal entitlement the more a vm/world consumes the more likely it is to be prempted by another vm/world ● http://www.vmware.com/resources/techresources/10131 BriForum | © TechTarget 8
9.
Compute with a
Physical PC OS/Apps/Profil e CPU 1 BriForum | © TechTarget 9
10.
Compute with Citrix
XenApp OS/Apps/Pr OS/Apps/Pr OS/Apps/Pr OS/Apps/Pr OS/Apps/ ofile OS/Apps/ ofile OS/Apps/ ofile OS/Apps/ ofile Profile Profile Profile Profile CPU 1 CPU 2 BriForum | © TechTarget 10
11.
Compute with VDI
CPU 1 CPU 2 BriForum | © TechTarget 11
12.
vSphere Compute This is
poor performance monitoring BriForum | © TechTarget 12
13.
vSphere Compute This is
better performance monitoring - ESXTOP Display Metric Threshold Explanation Overprovisioning of vCPUs, excessive usage of vSMP or a limit(check CPU %RDY 10 %MLMTD) has been set. Excessive usage of vSMP. Decrease amount of vCPUs for this CPU %CSTP 3 particular VM. This should lead to increased scheduling opportunities. The percentage of time spent by system services on behalf of the CPU %SYS 20 world. Most likely caused by high IO VM. Check other metrics and VM for possible root cause The percentage of time the vCPU was ready to run but deliberately wasn’t scheduled because that would violate the “CPU limit” CPU %MLMTD 0 settings. If larger than 0 the world is being throttled due to the limit on CPU. VM waiting on swapped pages to be read from disk. Possible cause: CPU %SWPWT 5 Memory overcommitment. BriForum | © TechTarget 13
14.
vSphere Compute BriForum
| © TechTarget 14
15.
vSphere Compute %CSTP probably
driving %RDY values BriForum | © TechTarget 15
16.
vSphere Compute Now with
fewer vCPU’s BriForum | © TechTarget 16
17.
Summary on Compute ●
Multithreading, vSMP ● Not priority based ● % Utilization is not the complete picture ● Latency = Health ● http://kb.vmware.com/selfservice/microsites/search.do?la nguage=en_US&cmd=displayKC&externalId=1017926 BriForum | © TechTarget 17
18.
Storage The wrath of
the math ● #1 cause of performance issues in server virtualization ● #1 cause of performance issues in desktop virtualization ● Latency = Health - 20ms - in trouble - 50ms - your users hate you BriForum | © TechTarget 18
19.
What You Need
to Know ● Capacity vs performance ● Random vs sequential ● Average vs peak ● Where it’s coming from ● Most are guessing BriForum | © TechTarget 19
20.
Storage Spinning disk
Device Type IOPS 7,200 rpm SATA drives HDD ~75-100 IOPS 10,000 rpm SATA drives HDD ~125-150 IOPS 10,000 rpm SAS drives HDD ~140 IOPS 15,000 rpm SAS drives HDD ~175-210 IOPS BriForum | © TechTarget 20
21.
RAID Penalty
RAID level Read Write RAID 0 1 1 RAID 1 and 10 1 2 RAID 5 1 4 RAID 6 1 6 BriForum | © TechTarget 21
22.
The Math –
RAID 5 50/50 Some back of the napkin math ● 500 users, Windows 7, 20 IOPs avg, 50/50 read/write RAID 5 ● 500 * 20 = 10,000 IOPs – 5,000 read, 5,000 write ● 5,000 write * 4 = 20,000 + 5,000 read = 25,000 IOPs ● 25,000 IOPs on 15K spindles (200 IOPS) = 125 spindles BriForum | © TechTarget 22
23.
The Math –
RAID 10 50/50 Some back of the napkin math ● 500 users, Windows 7, 20 IOPs avg, 50/50 read/write RAID 10 ● 500 * 20 = 10,000 IOPs – 5,000 read, 5,000 write ● 5,000 write * 2 = 10,000 + 5,000 read = 15,000 IOPs ● 15,000 IOPs on 15K spindles (200 IOPS) = 75 spindles BriForum | © TechTarget 23
24.
The Math –
RAID 10 20/80 Some back of the napkin math ● 500 users, Windows 7, 20 IOPs avg, 20/80 read/write RAID 10 ● 500 * 20 = 10,000 IOPs – 2,000 read, 8,000 write ● 8,000 write * 2 = 16,000 + 2,000 read = 18,000 IOPs ● 18,000 IOPs on 15K spindles (200 IOPS) = 90 spindles BriForum | © TechTarget 24
25.
vSphere Storage Latency
Application A Application Latency Filesystem Guest I/O Drivers R R = Physical Disk “Disk Secs/Transfer” Device Queue S G = Guest Latency K G K = ESX Kernel Virtual SCSI VMkernel Filesystem D D = Device Latency BriForum | © TechTarget 25
26.
vSphere Storage Performance monitoring
for storage Display Metric Threshold Explanation Look at “DAVG” and “KAVG” as the sum of both is DISK GAVG 20 GAVG. DISK DAVG 20 Disk latency most likely to be caused by array. Disk latency caused by the VMkernel, high KAVG DISK KAVG 2 usually means queuing. Check “QUED”. Queue maxed out. Possibly queue depth set to low. DISK QUED 1 Check with array vendor for optimal queue depth value. Aborts issued by guest(VM) because storage is not DISK ABRTS/s 1 responding. Can be caused when paths failed. DISK RESETS/s 1 The number of commands reset per second. SCSI Reservation Conflicts per second. Can be DISK CONS/s 20 caused by too many VMDKs on a datastore. BriForum | © TechTarget 26
27.
Building for Read
IOPs Fairly easy ● Memory - Storage controller cache, PVS ● Host/Hypervisor - CBRC, Intellicache ● Storage - SSD tiering / flash cache BriForum | © TechTarget 27
28.
Building for Write
IOPs Much harder…and expensive ● Profiles/Apps ● Spinning disk ● SSD tiering ● Local disk ● IO optimization (dedupe, serializing IO) BriForum | © TechTarget 28
29.
Storage Summary ●
25,000 IOPs R5 50/50 – 125 spindles ● 15,000 IOPs R10 50/50 – 75 spindles ● 18,000 IOPs R10 20/80 – 90 spindles ● Latency is the key metric ● Write IOPs & things that cause it is #1 focus BriForum | © TechTarget 29
30.
How does this
relate to VDI failure? ● Pilot performance is great, then terrible in production ● Boot storm vs login storm ● Applications in gold image vs streamed ● Read/write ratio is important ● Anti-virus software ● Existing desktop images BriForum | © TechTarget 30
31.
Guessing You need to
use tools to do this ● Initial sizing ● Determine peaks and when ● Baseline application impact ● Monitor application impact over time ● Application updates/changes BriForum | © TechTarget 31
32.
Project testing Good to
know what you are and aren’t doing ● Unit/system testing ● Application testing ● Performance/scalability testing ● Operational testing ● User acceptance testing BriForum | © TechTarget 32
33.
Summary ● Understand your
limited resources (compute/storage) ● Don’t guess ● 5 users = what kind of testing, what are you really accomplishing? BriForum | © TechTarget 33
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