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Forum Discussion
ReadyNAS: lost data after removing a drive : case #17927967
Details are in the support case. A friend was interested in the build quality of the and removed one the drives and put it back. I experienced errors (in the support case) which I managed to resolve b...
Well not working for NetGear, I don't know the details of your case. However I can still make a few comments:
1. If you store important data primarily on your NAS you should backup that data regularly e.g. to a USB disk, another NAS or some place else. RAID is not a backup. See Preventing Catastrophic Data Loss
2. I repeat RAID is not a backup. RAID (except for RAID-0) provides redundancy or high-availability. If a disk fails, data remains intact. Now when you remove a disk if you do it while the NAS was on (i.e. hot-remove) you can't trust the data on the disk you remove. When you add the disk back it will be wiped and a resync take place. This resync puts heavy stress on both disks. Now for example if the disk you didn't removed is beginning to fail, the heavy stress of the resync could finish it off taking all your data with it. Experimenting with RAID when you don't have your data backed up is asking for trouble.
1. If you store important data primarily on your NAS you should backup that data regularly e.g. to a USB disk, another NAS or some place else. RAID is not a backup. See Preventing Catastrophic Data Loss
2. I repeat RAID is not a backup. RAID (except for RAID-0) provides redundancy or high-availability. If a disk fails, data remains intact. Now when you remove a disk if you do it while the NAS was on (i.e. hot-remove) you can't trust the data on the disk you remove. When you add the disk back it will be wiped and a resync take place. This resync puts heavy stress on both disks. Now for example if the disk you didn't removed is beginning to fail, the heavy stress of the resync could finish it off taking all your data with it. Experimenting with RAID when you don't have your data backed up is asking for trouble.
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