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Dell Equallogic issues
Hi,
We have a dell equallogic used as ESX storage for three esx hosts.
the event log says "
active control module cache in now in write through array performance is degraded"
This has resulted in a sluggish and very slow performance .
I have unticked both options in Members --> member name --> controllers which reads as :
use write-through mode if only one controller is functional
use write-through mode if battery charge is below tolerance
still performance is slow and I can not find out how I can find out what mode the array is running in .
it is dell eqaullogic ps4000 model 70-0120 , chassis 1603 with control module model being 70-0120(type8)
please help if you can and all posts are highly appreciated
Anonymous
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May 27th, 2015 12:00
Hello Stranger12,
Did you do a firmware upgrade? During the transition you will see that message, then it will go back to wrtite-back. In the EQL GUI, select the member, then the "Controllers" tab. You should see both controllers with same firmware. Under "Memory Cache" you will see the status of "write-back" or "write-through"
If this is correct, most common causes of performance issues in ESXi is not being in compliance with the best practices of EQL with ESXi.
http://en.community.dell.com/techcenter/extras/m/white_papers/20434601/download
All the steps in this Tech Report need to be done. Some like Delayed ACK will require maint mode and a reboot.
Regards,
Don