October 19, 201411 yr I just recently setup an Unraid 5 Server. I've had the drives for a while in a Windows machine without any issue. In the past two weeks I lost 2 2TB drives. My configuration is below. 3x 2TB WD Green 4x 1TB WD Green 1x 120GB SSD (Cache Drive) No Parity (Ordered but hasn't arrived yet) Sigh.... Plugins: SabNZB, SickBeard, Coachpotato and MySQL all installed to Cache drive. Can anyone think what might have caused this or is it just bad luck?
October 19, 201411 yr Lots of missing information. How old were the drives? What were the smart reports for those drives? Were there any problems/errors during prelear? Do you have a syslog for the failures? What power supply are you using? Are you running a UPS? And why would you be running unraid without a parity drive?
October 19, 201411 yr Author Both drives were 2+ years and heavy used for movies/tv shows. When I migrated to unraid I did a smart test on all the drives and they were successful. I'm running without a parity because I migrated over using the same disks. I have a bigger parity drive coming in the mail. Just hasn't arrived yet. CoolerMaster 500 - RS500-PCAR-A3. No UPS at the momment. I didn't preclear because I didn't have the drive space at the time. I'm starting to think that was a mistake... Is the syslog preserved after reboot? I've already shutdown the machine to remove the drives.
October 20, 201411 yr First thing, DO NOT panic!!!! Do not do anything more to those drives EXCEPT to get a smart report off them until one of the experts in this type problem can advise you. unRAID uses a standard format for the data drives and the data can be retrieved from the undamaged part of the drive even if sections of it are bad. There is also a possibly that file structure defects can be corrected. There is also a windows utility which will read a unRaid drive on a Windows machine. I personally would stop writing to the array until you get this all sorted out. While a parity drive will help you recover quickly and easily from single drive failures-- but do not think that this level of protection is all that you need if your data is irreplaceable. For that, you need a backup of the server. UPS are almost a requirement for unRAID servers. unRaid simply does not deal well with improper shutdowns. But you have have not experienced a power outage, this is unlikely the source of your present problems.
October 20, 201411 yr Agree with Frank -- do not panic. Just how much data you've actually lost depends on how much the Reiserfsck utility can recover, but wait for a Reiserfsck expert to weigh in with specific instructions for this. Clearly any data it can't recover is simply lost, unless you have backups. I don't agree that "UPS are almost a requirement for UnRAID" => I think they're MANDATORY. You do NOT want to run an UnRAID server without a UPS ... period. Finally, as Frank also noted, don't think that once you have a parity drive you don't need backups => neither UnRAID or any other RAID system is a substitute for backing up your data.
October 20, 201411 yr Author Not panicing! I'm keeping cool. I currently have the system offline until the my parity drive arrives. Can't risk losing anymore. Luckly it looks like I only lost some movies which isn't a big deal to me. Unraid won't recognize the drive at all. Even when I start the PC with the drive attached the POST hangs and takes over a minute to start where it normally POST in seconds. I put the drive into another Windows machine to see if I could get it to start with it at all. The BIOS won't even recognize that its attached. Thanks for the advice on the UPS. I'll be picking one up.
October 20, 201411 yr Not panicing! I'm keeping cool. I currently have the system offline until the my parity drive arrives. Can't risk losing anymore. Luckly it looks like I only lost some movies which isn't a big deal to me. Unraid won't recognize the drive at all. Even when I start the PC with the drive attached the POST hangs and takes over a minute to start where it normally POST in seconds. I put the drive into another Windows machine to see if I could get it to start with it at all. The BIOS won't even recognize that its attached. Thanks for the advice on the UPS. I'll be picking one up. Did you try attaching with a fresh SATA cable? Cables can and do go bad.
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