Copy of simple file IO latency?

A single copy of the file on the disk C: local, from one folder to another on a latency of disk causes of VM (LVAD/wr) to go up to 300 m, if I give the virtual machine to Windows 2008 R2 another drive, D:, that is located on another logical unit number, a copy of the file to C:\ D:\ makes same latency LVAD/wr go up to 1500ms. The high write latency is measurable on the other virtual machines on the same LUN.

The same file copy activity on a virtual machine to Windows 7 on the same left LUN disk latency (LVAD/wr) less than 20 ms.

Latency is measured with esxtop on the host and iometer within guests. There is no other virtual machine running in my tests.

Is the latency of disk * supposed * to go so high a simple file copy? It would make me uncomfortable if someone copies a file to another folder on the file server could explode latency of writing for all other virtual machines too. Or is he not supposed to, and I've misconfigured something?

Our facility:

Server is HP Proliant DL165 G7

SAN is HP MSA P2000i G3

ESXi 5.0 driver cumulative 2

The server has 4 cards gigabit ethernet. vmnic0 is connected to a switch, here the networks management and virtual machine are connected. vmnic1 is not used. vmnic2 goes to the port A0 on the SAN. vmnic3 goes to the port A1 on the SAN. Controller B on the MSA was arrested. The SAN has two LUNs. Using 'Manage paths' I disabled path vmnic2-A1 to Lun0 and vmnic3-A0 to Lun1, so each LUN has a dedicated cat6 cable. Both the Windows 2008R2 and Windows 7 virtual machines have been installed at Lun0.

Thanks and strange that this behavior did not get all the attention. It's a bit it could cause strange results on the shared storage if several virtual machines are competing for the same disk systems.

It could be that in reality is this kind of wholesale IOs often not possible, should it really be 32 MB of available continuous free disk space.

Tags: VMware

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