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Forum Discussion
Replacing 2 Drives
We have a ReadyNAS Duo 4 with 4 3TB drives in X-RAID. Drives 3 and 4 are reported as dead in the admin console. So my question is what is the correct way to replace the drives so as NOT to lose any d...
Sorry, ReadyNAS Pro 4 and it has X-RAID2 which can tolerate 2 drives being lost
Hi,
X-RAID2 is the newer version of X-RAID. X-RAID2 doesn't mean dual redundancy.
X-RAID(2) on 4 HDDs uses a RAID5, so single redundancy.
If you check on the GUI of the NAS, do you still see the volume?
I turned the NAS back on and now dont see the volume but use to with 2 drives labeled as "dead". I read on here that you might be able to clone the dead drives to new drives, turn the NAS off and insert the new drives. I am cloning 1 old drive to a new drive now. With the volume not showing now, is there any hope? The data should still be on drive 1 and 2, right? My hope is to clone the new drives with the old drives data, insert and power on and this will start a resync.
Your procedure can work, if the cloning works. If one clone fails, you can clone the other drive.
But it is imperative that you have three working drives. Without that, your data are lost, or must be recovered with raid recover software if the two broken drives work "somewhat".
Please detail what is broken with your two broken drives!
I agree that more context on what led up to this failure would be helpful.
If your data is important to you, you are better off using a professional recovery service (though it is expensive) - especially if you don't know what you are doing (which appears to be the case here).
Cloning is only useful when the disks themselves have failed, but are still mostly readable. if you are cloning a failed drive, the clone won't be perfect (some data will be corrupted). So even if it works for you there usually will be file corruption that RAID cannot repair.
There are other failure modes when the drive(s) haven't failed, and cloning won't help at all in those cases.
If you do try cloning, make sure the NAS is powered down when you install the cloned drive. Also skip the system file check when you first boot the system. If it comes up, make a backup!
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