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Multiple disk failures on ReadyNAS Pro 6
We experienced a failure on one of our two, redundant ReadyNAS Pro 6 devices. The file system went wonky (missing folders and files) before any error was reported by the system, and it ultimately ended up reporting one of the drives had failed. We swapped in a new drive, but the filesystem did not recover properly despite the RAID, and the system later reported finding no volumes whatsoever. After a factory reset, the system now reports two more drives have failed, in different bays from the previous failure. I have a very hard time believing 3 out of 6 drives failed simultaneously, so something else seems to be amiss. Any ideas? Maybe these drives are all fine and it's just the NAS device that's shot??
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The system sometimes will declare drives to be dead when they aren't, so you should confirm it. Test the drives in a Windows PC with vendor tools (seatools for seagate, lifeguard for western digital), and take a look at the SMART stats while you are at it. Then you will know...
Do you run the maintanance functions (scrub) If you never run scrubs or file system scans, then it is possible that you had failures that were undetected until you tried to read from or write to a failing section of the disk. The system resyncs, and then of course it reads/writes every sector in the data volume - and that can uncover problems you didn't know you had.
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