Device naa.5000c5000b36354b performance has deteriorated. I/O latency increased from average value of 1832 microseconds to 19403 microsecondVerify if the iSCSI environment is accordance with Equallogic's network configuration requirements and recommendation for high performance and reliability.
Verify if the Hosts NICs, Switches and Arrays are at latest drivers\firmware revision.
Verify if the ESX hosts have Delayed ACK disabled, and the iSCSI login timeout settings are set to 60 seconds:
Telnet\SSH directly to the host IP address and run the following commands and check the results:
vmkiscsid --dump-db | grep Delayed
vmkiscsid --dump-db | grep login_timeout
These values should reflect "0" and "60" respectively.
Disable Delayed ACK and change the iSCSI login timeout settings if needed
In case further troubleshooting is needed, please contact Dell Tech support. The Following logs will be helpful:
VMsupport logs from the ESX hosts.
Switches Logs
SANHQ Archive if available:
Start SANHQ and select Monitor
On the drop down select create archive.
Choose ‘select all groups’ or select a specific group.
Once selected, click on ‘create archive’ The file is in *.gprx format
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