esxi suddenly high disk write latency

Esxi 5.5 on HP DL380 servers and local SSD datastore. Veeam backup and Win 2008/12 hosts

Running fine for a long time, all of a sudden its ground to a slow pace with lots of disk write latency errors.
Nothing has changed.

Veeam one doesn't show any one particular VM - just lots of VM's

Have updated the hpsa driver and the 440 controller firmware.
Looking for any ideas on what it could be?
I'm currently checking for snapshots and none exist.

Hardware all reporting as ok. Have power cycled everything with no difference.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Did this issue occur after the firmware and driver update ?

there are reported issues with firmware and HPE drivers
KenziiAuthor Commented:
Hi Andrew,
The issue was present before the firmware and driver updates. No reported issues with the old or new firmware / driver versions.
I have just noticed Veeam errors:
"Lost access to volume (volume number) due to connectivity issues. Recovery attempt is in progress and outcome will be reported shortly."

Roughly every 5-10 minutes.

I'm beginning to think its a hardware fault that sensors are not picking up on?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Test hardware, and make sure you are using the latest firmware and version/build of ESXi 5.5
KenziiAuthor Commented:
What hardware tests do you recommend?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
HPE tests, CPU, Memory.... you should be able to find diagnostics hardware tests on HPE media.
andyalderSaggar maker's framemakerCommented:
If you use hpssacli from the HPE utilities you can generate a report and upload it here,

/opt/hp/hpssacli/bin/hpssacli ctrl all diag file=/tmp/ ris=off xml=off zip=on

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