Hi Fellow Admins!
I am using a managed service, which is running VMware vSphere on 3PAR 9450.
It is running quite well except times, when couple of Windows VMs start batch job writing just couple hundred but big I/O (1 MB+) - whole array struggles and we see high latency spikes across all datastores.
As a temporary workaround I applied IOPS limits on these VMs (managed to get value high enough not to impact the app but low enough to make array happy).
Wonder if anyone had similar problem?
What better solution may be?
I am thinking about requesting provider to use Disk.DiskMaxIOSize parameter (
https://kb.vmware.com/s/article/1003469 ) to limit max IO size on the host, but I cannot find clear info what the value should be. I found old HP EVA documentation suggesting 128 KB and PureStorage 4MB, but nothing 3PAR specific.
Anyone has this parameter changed from the default 32MB in environment?
Thanks in advance, have great day