DSS on ESXi 4.1 - Slow RAID5 Reads?

[To-M]

Actually I would test with it on for the LUN, also are you using Block IO or File IO?

[npusnik]

I'm going to try using raw disk mapping as it looks to be a better way to present DSS with the array (since the LUN im carving from is local).

[Gr-R]

I'm going to try using raw disk mapping as it looks to be a better way to present DSS with the array (since the LUN im carving from is local).

misread your post....WB on RAID....
like 'To' says... try it on for the LUN.

[npusnik]

Update:

Re-initialized the arrays, gave DSS raw access to the 1.8TB array - both virtual and physical RDM methods.

Results:
Write, 60-70MB/sec
Read 20MB/sec

I only have the option for Write Through or Write Back - and I'm not sure why those would effect reading from the LUN - but I'll change it next and see what the results are.

[npusnik]

Another update:
Created an ISCSI volume using FILE I/O, mapped the target to my Win 7 management desktop

Results
100MB/Sec write
20MB/Sec read

I'm going to try to install Dell's OpenManager to see if there's something I'm not catching with the PERC's RAID5 array.

[npusnik]

Actually I would test with it on for the LUN, also are you using Block IO or File IO?

This was just a simple test using SMB/CIFS share through a Windows 7 client (management box). Not sure how to set IO options (if they are available for this type of share?)