performance has deteriorated. I/O latency increased from average value of

[prashanthbgoud]

Hi,

Can you please help me understand the below warnings

Device naa.600601607b702500727114a4cca9e111 performance has deteriorated. I/O latency increased from average value of 12478 microseconds to 511125 microseconds.

Thanks in the Advance.         

[sparrowangelste]

that means the delay from when your command was issued to when it occurs  has went from 12 miliseconds to 511

so either there is a lot of load on the lun or there is somethign wrong with your storage.

if its temporary it could just mean there wa s lto of io on a vm.

[prashanthbgoud]

How do I identify that?

[sparrowangelste]

ssh into your host

run esxtop

press u for disk view and look for DAVG

http://sparrowangelstechnology.blogspot.com/2012/08/check-esxi-hosts-disk-latency-storage.html