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BP1018 Sizing and Best Practices for Citrix XenDesktop with Dell EqualLogic Storage 28
Figure 13 IOPS on one of the EqualLogic array during login storm – 1270 VMs
Note: The above SAN HQ chart shows the peak IOPS of 6200 during the login storm on one of the
array members. Almost the same number of IOPS was observed on the other EqualLogic member.
The storage array disk latency never went beyond 5 to 6 ms even at the peak I/O during the login
storm. We observed an increase in CPU and network resource utilization at peak login, but it was well
within the acceptable limits.
5.7 Boot storm
We restarted all virtual desktops from VMware vCenter to simulate the boot storm. The peak IOPS
when 1270 virtual desktops were booted was around 15000. The average latency on both storage
arrays was less than 10 ms and the storage arrays were able to handle this I/O burst with no significant
increase to the latency.
5.7.1 Storage layer: EqualLogic array performance