iscsi performance

[To-M]

What version are you running and is there Write Back option on the LUN? Is the Write cache enabled on the RAID controller?

[Gr-R]

make sure firmware and dss are current versions.
search the forum for this:

MaxOutstandingR2T - 8
MaxRecvDataSegmentLength - 262144
MaxXmitDataSegmentLength - 262144


and make the tweaks from the console.

write back can help too.

[daobang wang]

Hi Todd, Thanks for your reply, write back option on the LUN was enabled, and what's the meaning of the Write cache enabled on the RAID controller? I used the software RAID, not hardware RAID. thanks!

[daobang wang]

Hi Gr-R, it's seems that the parameters you pointed had incorrect value, i will try it again with you suggestion, thank you very much!

[daobang wang]

Hi Gr-R, I changed the configuration parameters, the performance did not improve. Is there any other reason?

[Gr-R]

What version of DSS you using?

Is hardware RAID an option ?

[To-M]

See this link on running IO tests.

http://blog.open-e.com/a-few-practic.../#comment-4743

or run BST5 (NTFS formatted) http://www.nu2.nu/download.php?sFile=bst514.zip
Sequential 1MB for reads and writes
Sequential 4MB for reads and writes

[daobang wang]

Hi Gr-R, There is no hardware RAID, we're using the software RAID,and the DSS version is 4622.

[Gr-R]

Hi Gr-R, There is no hardware RAID, we're using the software RAID,and the DSS version is 4622.

Update to 5087.
Some updates to SCST that may help you.