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A huge latency occur this morning (10:00 am) on one of our storage that cause all servers connected to the storage to have more than 1seconde latency.
The Storage seemed to freeze with a latency of 1000ms on all LUN (Average of 8000 MS)
First of all when we talk about latency issues we need to collect and analyze the performance logs from that storage
Operations consumed to much cache Structure and the Hosts needed extremply long time to allocate the cache structures
After we analyzed the event.txt log we found a lot of activating/deactivating the snapshot activity before the issue occurred, print screen attached
Moving forward we found some operations that consumed a lot of cache Structure and the host IO need extremely long to allocate the cache structures, print screen attached
At the end finally many IOs were timeout and hosts sent abort commands to cancel the IOs