March 15, 201610 yr Yesterday I started rebuilding a 4TB drive (2.85TB/4TB utilitized). The initial estimate was 141MB/s, and 20-some minutes in it was down to 120MB/s, which still would've completed this morning. When I checked on it at roughly 12:45am, 3-4 hours later, the speed had dropped to under 70KB/s. Rather than chasing it then, I just let it do its thing over night. The sub-12 hour projections have now turned into just over 1.5 years. The "Cancel" is clearly labeled has leaving the array unprotected- . However, with it using the "same cable" SAS=>SATA breakout cable on the same SUPERMICRO AOC-SAS2LP-MV8, after unraid disabled the previous 4TB drive in that spot in the array (for a series of block-level write errors) it could've been a cabling item or a controller issue (went into service late Aug-2014). But, from this state during a rebuild... is there a way that would permit me to restart the rebuild from parity again? Circumstance: I simply pulled the old drive, which is already 10 days "out of the array" (hadn't reconfigured notifications) so I'd definitely want to rebuild the drive rather than blessing it, and generating a new parity. The "replacement" drive had arrived yesterday morning, and with the array having been in an emulating state for over a week... I did not preclear it, restoring the protection for the rest of the array, prior to message with the "disabled" device outside of the system was my intention... Based on the attached dmesg, the drive that 'encountered' the command error was one of the "old" 2TB green drives that has been in use since I was running 4.6. However, the other 3 drives on the SAS2LP-MV8 include the 4TB parity [which probably should be on a motherboard header...], 3TB data, 4TB being rebuilt. unraid_6-1-9_syslog.txt unraid_6-1-9_dmesg-grepping-ata1.txt
March 15, 201610 yr Community Expert If I’m understanding your question, you want to cancel the rebuild and restart it again. You can, there's no problem, though you can't resume it, it will always start from the beginning, you can even cancel and rebuild to a different disk. After pressing cancel, you can stop the array, if want you can power down the server, and when you restart the array the rebuild will also restart. About the disks, it’s difficult to give more advice without seeing SMART reports, you can go to tools click diagnostics and attach the complete zip.
March 15, 201610 yr Author Your understanding was correct, and thanks for response. I'd rather re-write the first 19.8% than trust the blocks from roughly when the controller did its reset, during reads. As long as cancelling does not lull the system into a false sense of security- I'm OK with it starting over.
March 15, 201610 yr Community Expert Your understanding was correct, and thanks for response. I'd rather re-write the first 19.8% than trust the blocks from roughly when the controller did its reset, during reads. As long as cancelling does not lull the system into a false sense of security- I'm OK with it starting over. If you will post your diagnostics as requested maybe we can help determine the cause. No point in doing it again only to have it fail again.
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