- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
Help with data recovery after crash
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Help with data recovery after crash
Help/advice needed:
I have a 4 disks ReadyNAS314, configured in Raid5. This weekend my disk 2 (=parity disks) suddenly stopped worked. Normally no problem because a Raid5 can survive that. However, before the new disk I ordered could arrive also disk 1 stopped working. So now I have a dead system and my readynas no longer sees the volume.
Is their a way to still rebuild the volume with 2 new disks and save some of the data on disks 3 and 4 that are still working?
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Help with data recovery after crash
One option is to try to clone the disk 1 to one of replacements. You'd use a cloning tool that does sector-by-sector copying to do that. Clonezilla is one possibility.
Then power down the NAS, insert the clone, and power up the system.
Cloning disk 2 might also be possible, but it's likely out of sync with the array.
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Help with data recovery after crash
Disk 2 is not a "parity disk". The parity and all of the data is spread across all drives, so you cannot recover anything from a subset of less than 3 of 4. Hopefully, the second failed drive is healthy enough to the cloning procedure, so you'll have three drives to work with.
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Help with data recovery after crash
Thanks for the advice. I'm cloning the faulty disks now.
Would you advice to swap out the 2 faulty disk together and put in the cloned ones, or only do one and let the array try a rebuild before replacing the second problem disk?
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Help with data recovery after crash
@jdlt wrote:
Would you advice to swap out the 2 faulty disk together and put in the cloned ones, or only do one and let the array try a rebuild before replacing the second problem disk?
Disk 2 failed a while before disk 1, so it is probably out of sync with the array. So I wouldn't use the clone of disk 2. Just leave the slot empty. Then boot the system up read-only using the instructions on page 74 here: http://www.downloads.netgear.com/files/GDC/READYNAS-100/ReadyNAS_%20OS6_Desktop_HM_EN.pdf
If you have access to your data, then back it up right away (before you insert a new disk into slot 2).