Highlighted
2 Bronze

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 

0 Kudos
1 Reply
Highlighted

RE: Dell Equallogic issues

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

Social Media and Community Professional
#IWork4Dell
Get Support on Twitter - @dellcarespro