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Preliminary testing of VMware View with EMC FAST Cache

This test evaluates the impact of boot storm, logon storm, recompose, refresh, antivirus scan, patch updates, and task worker scenarios on 150 Windows XP desktops using EMC FAST Cache with RAID 10. Results show significant improvements in boot times, IOPS handling, disk utilization, and response times with FAST Cache enabled.

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Preliminary testing of VMware View with EMC FAST Cache

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  1. Preliminary testing of VMware View with EMC FAST Cache

  2. Boot Storm with FAST Cache Linked Clone Boot and Logon Storm This test measures the impact of boot + user login of 150 Windows XP desktops simultaneously RAID 10 2+2 RAID Group – 15K 450GB Drives – FAST Cache 133 GB (4x73GB EFD) • Observations and Conclusions • Time to boot all desktops to usable state and log in all users decreased from 20 to 9 minutes • Peak response time decreased from 225ms to less than 50 ms

  3. Boot Storm with FAST Cache (Cont) 150 Desktop Linked Clone Boot and Logon Storm w/Fully Warmed Cache Boot Storm after Antivirus Scan which promotes all View Repilca data to FAST Cache • Observations and Conclusions • Time to boot all desktops reduced to 3 minutes from 20 minutes with no FAST Cache • FAST Cache absorbs 99% of I/O – Disks never more than 45% utilized • During peak load FAST Cache is absorbing over 2,800 write IOPS and 10,000 read IOPS • During peak load FAST Cache sinks enough write IOPS to saturate an entire shelf of 15K FC drives • During peak load FAST Cache sinks enough read IOPS to saturate 60 15K FC Drives • Estimated number of drives required to match FAST Cache performance: 66

  4. View Recompose Linked Clone Pool Recompose This test measures the impact of a recompose operation on 150 desktops • Observations and Conclusions • Replica copy happens almost instantaneously with FAST Cache enabled • Disk average IOPS decreased by 70% and peak IOPS by 67% • FAST Cache would enable pool recompose operations during production which could be critical in failover, disaster recovery scenarios and change control windows

  5. View Recompose (Cont) Linked Clone Pool Recompose of 150 Desktops View recompose operation bound by vCenter concurrent operations throttle • Observations and Conclusions • FAST Cache absorbs 98% of I/O – disks are never more than 28% utilized • Host response time never exceeds 2 ms during recompose • Estimated number of drives required to match FAST Cache performance: 13

  6. View Refresh Linked Clone Refresh This test measures the effect of a View Refresh of 150 Windows XP desktops Observations • Refresh lasted same duration with and without FASTcache due to vCenter throttling • Average disk IOPS decreased by 73% • Peak disk IOPS decreased by 75% • Conclusion • Substantially lower average and peak disk usage with FAST Cache enables remediation of virtual desktops while still delivering high performance • On demand refresh of non-persistent desktop pool members can be scheduled in real time during production hours which is an enabling technology for truly non-persistent pools of stateless desktops • Scale testing should show FAST Cache will enable significantly high user per spindle density due to decreased disk workload

  7. View Refresh (Cont) View Refresh of 150 Desktops View refresh operation bound by vCenter concurrent operations throttle • Observations and Conclusions • FAST Cache absorbs 99% of I/O – disks are never more than 24% utilized • Host response time never exceeds 5 ms during refresh • Estimated number of drives required to match FAST Cache performance: 18

  8. Antivirus Scan Antivirus Scan This test measures the impact of running antivirus scan simultaneously on 150 desktops • Observations and Conclusions • Time to scan a desktops decreased from 67 to 15 minutes with FAST Cache • 87.2% decrease in Peak Lun Response time • Peak Host Response time decreased from 382 ms to 11.86 ms

  9. Antivirus Scan (Cont) Simultaneous Full Antivirus Scan of 150 Desktops McAfee 8.5i with latest patch definitions and OAS enabled • Observations and Conclusions • Average time to scan a desktop decreased from 67 to 15 minutes with FAST Cache • Disk utilization never above 10% - FAST Cache effectively handles 100% of I/O once warmed • During peak I/O FAST Cache handles over 1,100 write IOPS and 14,300 read IOPS • Estimated number of drives required to match FAST Cache performance: 83

  10. Patch Updates Patch Updates This test measures the impact of patching 150 Windows XP desktops Nine security updates applied in series and systems rebooted • Observations and Conclusions • Time to patch all the desktops decreased from 43 to 22 minutes • Peak Guest Disk Response time decreased from 113ms to 43ms

  11. Patch Updates (Cont) Patch Updates This test measures the impact of patching 150 Windows XP desktops Nine security updates applied in series and systems rebooted – No randomization of the workload • Observations and Conclusions • Heaviest write workload of all tests: 45:55 read:write ratio • During peak workload FAST Cache is absorbing 2200 write IOPS and 9000 read IOPS • Estimated number of drives to equal FAST Cache performance: 60

  12. RAWC Task Worker RAWC Test Run This test simulates 150 task workers running common Office applications, Adobe Reader and IE8. Observations • Neither test run is completely storage bound at this user density. • FAST Cache enables improved application response times even when not storage bound due to lower latency access times • Conclusion • Scale testing should show FAST Cache enabling higher user density for a given set of disks which will drive lower TCO, CapEx and OpEx costs as well as higher ROI

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