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<p><font size="2" face="sans-serif">I'm presently running tests on a pool using 3x Samsung 850 SSDs on a LSI-9211-8i (IT) contoller. I thought I'd try seperating the intent log to see if lowering the write amplification on the pool-drives would help, so I added another matching SSD for that, but under load I still seem to get extensive checksum errors. Does anyone have any ideas as to what would be causing this?</font><br>
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<font size="2" face="DejaVu Sans Mono"> pool: test-array</font><br>
<font size="2" face="DejaVu Sans Mono"> state: DEGRADED</font><br>
<font size="2" face="DejaVu Sans Mono">status: One or more devices has experienced an unrecoverable error. An</font><br>
<font size="2" face="DejaVu Sans Mono"> attempt was made to correct the error. Applications are unaffected.</font><br>
<font size="2" face="DejaVu Sans Mono">action: Determine if the device needs to be replaced, and clear the errors</font><br>
<font size="2" face="DejaVu Sans Mono"> using 'zpool clear' or replace the device with 'zpool replace'.</font><br>
<font size="2" face="DejaVu Sans Mono"> see: <a href="http://illumos.org/msg/ZFS-8000-9P">http://illumos.org/msg/ZFS-8000-9P</a></font><br>
<font size="2" face="DejaVu Sans Mono"> scan: scrub repaired 0 in 0h0m with 0 errors on Wed Sep 24 18:20:56 2014</font><br>
<font size="2" face="DejaVu Sans Mono">config:</font><br>
<br>
<font size="2" face="DejaVu Sans Mono"> NAME STATE READ WRITE CKSUM</font><br>
<font size="2" face="DejaVu Sans Mono"> test-array DEGRADED 0 0 0</font><br>
<font size="2" face="DejaVu Sans Mono"> mirror-0 DEGRADED 0 0 0</font><br>
<font size="2" face="DejaVu Sans Mono"> c0t50025388700060D4d0 DEGRADED 0 0 155 too many errors</font><br>
<font size="2" face="DejaVu Sans Mono"> c0t50025388700060AEd0 DEGRADED 0 0 149 too many errors</font><br>
<font size="2" face="DejaVu Sans Mono"> c0t50025388700060C2d0 DEGRADED 0 0 174 too many errors</font><br>
<font size="2" face="DejaVu Sans Mono"> logs</font><br>
<font size="2" face="DejaVu Sans Mono"> c0t50025388A067DBE9d0 ONLINE 0 0 0</font><br>
<br>
<font size="2" face="DejaVu Sans Mono">errors: No known data errors</font><br>
<font size="2" face="DejaVu Sans Mono"> ---- errors ---</font><br>
<font size="2" face="DejaVu Sans Mono"> s/w h/w trn tot device</font><br>
<font size="2" face="DejaVu Sans Mono"> 0 2 6 8 c0t50025388700060D4d0</font><br>
<font size="2" face="DejaVu Sans Mono"> 0 0 0 0 c0t50025388700060AEd0</font><br>
<font size="2" face="DejaVu Sans Mono"> 0 0 0 0 c0t50025388700060C2d0</font><br>
<font size="2" face="DejaVu Sans Mono"> 0 0 0 0 c0t50025388A067DBE9d0</font><br>
<br>
<br>
<font size="2" face="sans-serif">Andrew Hettinger<br>
<a href="http://Prominic.NET">http://Prominic.NET</a> | Skype: AndrewProminic<br>
Tel: 866.339.3169 (toll free) -or- 1.217.356.2888 x. 110 (int'l)<br>
Fax: 866.372.3356 (toll free) -or- 1.217.356.3356 (int'l)</font></body></html>