LSI 9260-8i - Weird RAID10 speeds

jim82

Weaksauce
Joined
Nov 1, 2011
Messages
77
Dear community,

I'm currently running ESXi 5.5U1 on a Supermicro X9-SRL. I use a LSI 9260-8i RAID controller for all my datastores.

Main main datastore is a 4 x 3TB RAID10, consisting of WD RED series drives.

For some odd reason I can't understand, I'm experiencing 3 times faster WRITE speeds, than read speeds :( My other drives on the same controller, performs as expected.

I've tried everything to resolve this issue, without luck.

Here's what I've done:

* Try a new firmware
* New SAS cables
* New controller
* New battery and cache module (BBU)
* Re-initialize the array
* Re-learn the cache and BBU
* New ESXi installation
* Removing other drives from controller

All without luck.

The only way to reach slightly higher read speeds is to change the "Disk cache policy" to "No Read Ahead", but speeds are still way less then expected.

Please have a look at my attached screenshots, maybe I'm overlooking something.

Thanks
Jim

Always read ahead:
bVKEKcp.png


No read ahead:
ftRrLw4.png
 
Solved by recreating the RAID10 array from the Windows Storage Manager from LSI. Read speeds are now 6 times better ~300MB/s
 
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