SAS Drives - Extremely Poor IOPS

[iamrt]

Good afternoon,

I am experiencing an issue with some SAS HGST DKR5D-J900SS 900GB 10k 2.5" drives. They are experiencing extremely low IOPS, to the tune of ~30kb/s mean during a badblocks -ws run.

My hardware is as follows:
Dell R730xd 24x2.5"
2 x E5-2680 V3
Dell H730 - HBA Mode (confirmed)

Attached is a gstat pulled while running badblocks on every drive.


I have verified that write-cache is enabled on each drive. I stopped on one of the drives and restarted after to see if that would make a difference but to no avail.

Are these drives trash or are there settings that may need to be tweaked in the BIOS or freenas?

Any assistance would be greatly appreciated!

 

[iamrt]

Forgot to get include SMART data for one of the offending drives.

They've been around awhile but I would hope that they would be a little more performant than kb/s with SAS

 

[morganL]

badblocks is a strange way to look at drive performance... I'd suggest using a more normal testing process with known block sizes.

 

[iamrt]

I was running through the burn-in testing guide from qwertymodo. This one just a more substantial issue aside from the fact that I was unable to create an encrypted pool with these same drives. I kept receiving geli attach errors to a random gptid. Also, zero wiping the drive was looking to take nearly a week for a 900GB drive.

With that being said, I'd be happy to run through some dd tests to provide a little more context. I'll post some results as soon as I can.

 

[iamrt]

Ran a couple of dd if=/dev/zero tests on a couple of pools, MirrorTest with the questionable drives, and MirrorTest2 with known-working drives.

Here are the results of dd if=/dev/zero of=/mnt/* bs=4M count=10000.

Ctrl-t during the run with gstat running:

Completed test:

I let the test complete and came back to a Degraded state on the first pool. I guess that's my answer, just trash drives.

Side note: these tests were run with write-cache disabled. I planned on running another test with write-cache enabled but the degraded state message made it moot (cow's opinion).

One question I would like to ask though, how to run a quick wipe on multiple drives via command line? I saw mention of the dd command to do so, but what parameters would equate to the quick wipe via gui?