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OI+Nappit - help troubleshoot pool performance

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farscapesg1

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Aug 4, 2004
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Looking for some advice on troubleshooting an issue I have with a storage pool on my OI+Nappit server. The pool consists of 4 drives in a striped mirror (2 WD Black + 2 Samsung HD103SJ drives). The pool is set up for iscsi storage used by my PVR software. I've been having issues recording multiple HD shows and been trying to track it down and think I've finally isolated it to the storage pool performance.

Running CrystalDiskMark against that drive results in some horrible speeds. I'm talking around 40 MB/s Reads and less than 1 MB/s writes :eek:. Running a dd benchmark from Napp-it on the pool... never completes even when I set the file size low like 10.24 MB.

I'm wondering if I have a bad drive in the pool that isn't being reported for whatever reason, but I'm not sure what commands would help determine problem. I could attempt to move all the video off to another location and rebuild the pool.. but with almost a TB of data and the slow speed on the pool... that could take quite some time :(
 
drives c3t0d0, c3t1d0, c3t4d0, c3t5d0 are in the zpool in question...

iostat -en said:
---- errors ---
s/w h/w trn tot device
2 0 0 2 c3t2d0
2 0 0 2 c3t3d0
2 0 0 2 c3t0d0
2 0 0 2 c3t1d0
2 0 0 2 c3t4d0
2 0 0 2 c3t5d0
2 0 0 2 c4t5000CCA222C8B381d0
2 0 0 2 c4t5000CCA222C34201d0
2 0 0 2 c4t5000CCA221E1D477d0
2 0 0 2 c4t50014EE2AD59DC44d0
2 20 13 35 c4t50014EE2AD59E36Ad0
2 0 0 2 c4t50014EE258040CBBd0
2 0 0 2 c4t50014EE258041EAFd0
2 0 0 2 c4t50014EE2AD59D3B9d0
2 0 0 2 c5t8d0
2 0 0 2 c5t9d0
2 0 0 2 c5t10d0
2 0 0 2 c5t11d0
Click to expand...

I'll have to check fmadm when I get home since I don't have direct console access (iostat was run from the cmd option in Napp-it for these results, but fmadm faulty never returns anything when run from within the Napp-it web interface).
 
2 20 13 35 c4t50014EE2AD59E36Ad0

that is a lot of hardware errors. i've seen much higher but typically you don't want to see more than 3 max. something is wrong with that disk.

since you're using mirroring you can try detaching that disk from the mirror and seeing if that resolves the problem. obviously you won't want to run that way for an extended period of time but i would start there.
 
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