December 21, 201213 yr My build is below... Every time I try to run a parity check, a drive redballs... The log shows a bunch of errors. I have replaced the backplane, cables, controller on the group that fails, but still get a redball drive... I pull out the drive, pop it into another unraid server and preclear it without any issues. Pop it back in and the unraid server will rebuild the failed missing drive fine. After the array has rebuilt, I try to run a parity check and bam another drive gets redballed... This happens over and over... I have attached the system log, I captured it right after I tried the parity check, now /dev/sdp is redballed... Does anyone have an idea what might be wrong? syslog-2012-12-20.zip
December 21, 201213 yr Have you tried swapping power connectors around? With that many drives, your power distribution system has got to be a little complex. Perhaps a bad (high resistance junction) splitter is causing a voltage droop under load. If it were me I'd probably pull all the drive power wires completely out and put it back one at a time verifying each connection was solid, recrimping or soldering and heatshrinking where appropriate. Low voltage high amp current is sensitive to bad connections, the more load, the worse the situation gets.
December 21, 201213 yr Author I can give that a try... I have 3 separate feeds from the PS. No splitters etc. Each feed has 2 molex connectors that power 2 backplanes. This means 8 drives per power cable from the PS. I can swap out the cable feeding the center backplanes... About only thing that I have not tried. Strange that to repair the redballed drive the entire array spins up for about 6-8 hours. It rebuilds the drive perfectly each time.
December 21, 201213 yr I can give that a try... I have 3 separate feeds from the PS. No splitters etc. Each feed has 2 molex connectors that power 2 backplanes. This means 8 drives per power cable from the PS. I can swap out the cable feeding the center backplanes... About only thing that I have not tried. Strange that to repair the redballed drive the entire array spins up for about 6-8 hours. It rebuilds the drive perfectly each time. That's almost 15 Amps per power cable. What wire gauge are those cables? Can you double up and use more feeds from the PSU?
December 23, 201213 yr Author I have switched cases, controller cards. No errors on start up, that I was seeing using the SAS2 cards. Closing this issue.
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