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Forum Discussion
SATA reset
I recently started getting problems with my ReadyNAS Duo waking up – the boot process stopped soon after the start with the fans running fast, and needed a hard reboot to start. I raised a support tic...
Multiple drive failures in a RAID array are not that uncommon.
Generally the drives are the same model, purchased at the same time, placed in an identical physical environment, and run under identical loads. Considering all that, it is not very surprising that they often fail in batches. Quite similar to having your automotive brakes on both front wheels needing to be replaced at the same time. (See http://www.pdl.cmu.edu/PDL-FTP/Failure/ ... 06-111.pdf ... "We also present strong evidence for the existence of correlations between failures")
Also the SMART stats generally are good until the disk actually starts to fail. There often is not much lead time. So it is good to have a spare or two handy. And as you discovered, having a backup is quite important.
Generally the drives are the same model, purchased at the same time, placed in an identical physical environment, and run under identical loads. Considering all that, it is not very surprising that they often fail in batches. Quite similar to having your automotive brakes on both front wheels needing to be replaced at the same time. (See http://www.pdl.cmu.edu/PDL-FTP/Failure/ ... 06-111.pdf ... "We also present strong evidence for the existence of correlations between failures")
Also the SMART stats generally are good until the disk actually starts to fail. There often is not much lead time. So it is good to have a spare or two handy. And as you discovered, having a backup is quite important.
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