If one of drives in RAID 1 fails

jefferchong · Mar 2, 2018

Currenty I have 2 4TB drives which we will name it (drive 1) and (drive 2)
And let's say one of those drives have failed

So if the (drive 1) fails for example
Then I have to replace it with another drive with the same capacity

Are the files from the (drive 2) will be automatically mirrored again on the (drive 1) after I replaced it with another drive?

kanewolf · Mar 2, 2018

Assuming the rebuild works correctly, then yes. Removing the failed drive, replacing it and initiating a rebuild will mirror all the files from drive 2 onto the new drive.

But RAID1 is not a substitute for backups. RAID will not protect from a deleted file or a corrupted file system. Just the disk failure you mention. There are LOTS of ways to lose data that don't involve a disk failure.

doublejz · Mar 2, 2018

Yes, you would have to replace the drive with an equivalent drive. It is recommended to replace with the same exact drive/model/etc. Depending on the RAID software/controller setup, it may rebuild automatically or you may have to go into the RAID controller and initiate a rebuild to correct the degraded RAID array. Also, keep an eye on drive 1 after the rebuild as sometimes performing the rebuild will overwork the drive that its rebuilding from.

failboat · Mar 7, 2018

You have to check your raid status. It may require a manual rebuild.

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If one of drives in RAID 1 fails

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