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Forum Discussion
RN104 RAID5 volume lost after power loss all 4 volumes inactive
FW 6.4.2 (readynas 104 with 4 x 3TB disks in RAID5 - XRAID)
My Readynas 104 had its power cut off due to a PSU issue, it was basically idle at the time but when turned back on, booted up but did not show any raid volume anymore.
The front indicators are all blue and the admin page can be reached, the system page is attached and the error message
"No volumes exist
Netgear recommends that you create a volume before configuring others."
In the banner it says "remove inactive volumes to use the disk. Disk #1, 2, 3, 4"
There are certainly a few suspicious ata errors in the log preceding this (also attached), and the power loss may be incidental, though the fact that there are no logs following this event suggests the volume may have been degraded but still operational until power loss.
Bottom line, is the data recoverable and what is the best approach to try and recover it.
There are some similar posts on the forum, I am happy to open a support account and pay for this if required, but saw no means of doing this on the support page (this NAS is now EoL)
(aside - there are some references to RAID recovery s/w, ReclaiMe, I would also need to purchase this but it is unclear with this option if I would I need a 4 disk caddy to mount all the NAS HDDs at once + a target disk to recover to, or will it operate one at a time.)
Any pointers/next steps would be much appreciated
thx in advance
3 Replies
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DuncanR wrote:
(aside - there are some references to RAID recovery s/w, ReclaiMe, I would also need to purchase this but it is unclear with this option if I would I need a 4 disk caddy to mount all the NAS HDDs at once + a target disk to recover to, or will it operate one at a time.)
You would need a four disk enclosure.
DuncanR wrote:
FW 6.4.2 (readynas 104 with 4 x 3TB disks in RAID5 - XRAID)
Rather old - is there a reason it wasn't updated?
DuncanR wrote:
There are some similar posts on the forum, I am happy to open a support account and pay for this if required, but saw no means of doing this on the support page (this NAS is now EoL)
You can try emailing support (I think the address is readynassupport@netgear.com )
Do you have any experience with the linux command line ("ssh")?
Hi StephenB , thank you for your reply.
it sounds like the netgear support makes more sense than revcovery s/w +caddy+ recovery disk
yes, I'm more of a network guy but I do have some familiarity with ssh. Is there anything for netgear online I can follow to diagnose and try to recover the RAID or am I more likely to just reduce the chances of a support service sorting this out ?
thx again
DuncanR wrote:
Is there anything for netgear online I can follow to diagnose and try to recover the RAID or am I more likely to just reduce the chances of a support service sorting this out ?
Netgear doesn't provide any instructions in their KB articles, and there is some risk that you'd make recovery more difficult.
What you'd do is boot the NAS into tech support mode. You can then connect with telnet (not ssh) as root, and use a well-known support password - infr8ntdebug.
If the array is simply out-of-sync (which is likely the case), you can forcibly assemble it with mdadm and see if you can then mount the btrfs data volume. If that's the case you'd just reboot normally at that point. Since there are some lost writes (by definition) in an out-of-sync volume, there is the potential for some data corruption. I can provide some more details if you want to try this.
There are of course other possible failure modes, and there is no step-by-step guide I am aware of to diagnose them.
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