I have a Database Server installed as a virtual machine on a host. I found that every time when there is a backup, the latency increases to a few hundred millisecond. And the event log in vSphere shows a warning "Device naa.xxxx (iSCSI storage) performance has deteriorated,I/O latency increased from average value ....". I have checked the KB and changed some configurations in vSphere but still can't improve the latency of the iSCSI storage. Does anyone experience this issue too? This issue has annoyed me for a long time, could someone give help to me? Thanks a lot!
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