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Forum Discussion
readynas 204 4-bay - 1 disk not recognized
Hi, I have a 4-bay RN204. One disk of the 4 is suddenly not recognized so the entire volume has degraded. Using OS 6.10.8. Here is a screenshot of system->volume page. In the logs, I don't se...
The best thing you can do is pull the drive (if you do so with power on, make absolutely certain it's the right one, or you could lose your volume completely) and test it in a PC (or USB dock connected to a PC) using the drive vendor's tools.
Hi, thanks for your suggestion. I tried another disk (spare one I had), and plugged it into disk 2 drive/bay, but that is also not being read.
If I connect the existing disk 2 into the USB port of the RN204, can I include that to re-create the RAID5 with a global spare?
jnandi wrote:
If I connect the existing disk 2 into the USB port of the RN204, can I include that to re-create the RAID5
No. I guess you could do it manually with ssh, but it wouldn't be a good idea.
The best path is to first off-load all the data. Then either
- get a new NAS (probably not ReadyNAS, as Netgear seems to be exiting that business).
- or create a new volume with 2-3 larger disks, leaving bay 2 empty.
jnandi wrote:
with a global spare?
There might be some confusion here. A global spare is added to the array when the NAS detects a failure of another drive. It's not part of the array until that happens.
Hi, thanks for all your support. Unfortunately it seems both the Disk 2 and bay 2 slot are both damaged. The spare HDD I had, I connected to bay 2, but it wasn't recognised. The hdd-disk 2 I had I tried connecting using USB enclosure to PC - can't be read. However the spare HDD I connected to another NAS (Synology 423+) and that is read. So, it now Time to migrate all data from RN204 to my DS423+. I've moved most of my data (setup backup jobs on Netgear, but there a few failures (can't read some files from some of the folders).
Ran a diagnostic using RAIDAR, and got these errors. Any guidance on how to fix these so that all my data I can migrate.
Successfully completed diagnostics
System
- Disk 3 has 2 Current Pending Sectors
- Disk 4 has 1 Reallocated Sectors
- Disk 4 has 1 Reallocation Events
- Disk 4 has 6 Current Pending Sectors
- Disk 4 has 4 Uncorrectable Sectors
- Volume root is degraded
- Volume Data is degraded
Logs
- 2023-07-08 10:20:53: BTRFS critical (device md127): corrupt node: root=1 block=808026112 slot=0, unaligned pointer, have 1954840805480 should be aligned to 4096
- 2023-07-08 10:20:52: BTRFS critical (device md127): corrupt node: root=1 block=808026112 slot=0, unaligned pointer, have 1695506235459 should be aligned to 4096
- 2023-07-08 10:20:51: BTRFS critical (device md127): corrupt node: root=1 block=808026112 slot=0, unaligned pointer, have 1954840805480 should be aligned to 4096
- 2023-07-08 10:19:47: ufsd: "mount" (sdd2): is mounted as NTFS(rw) at 2023-07-08 04:49:47
- 2023-07-08 10:18:00: md/raid:md127: raid level 5 active with 3 out of 4 devices, algorithm 2
- 2023-07-08 10:16:36: ufsd: "umount" (sdd2): is unmounted at 2023-07-08 04:46:36
- 2023-07-08 09:57:52: BTRFS critical (device md127): corrupt node: root=1 block=808026112 slot=0, unaligned pointer, have 1954840805480 should be aligned to 4096
- 2023-07-08 09:57:51: BTRFS critical (device md127): corrupt node: root=1 block=808026112 slot=0, unaligned pointer, have 1954840805480 should be aligned to 4096
- 2023-07-08 09:57:49: BTRFS critical (device md127): corrupt node: root=1 block=808026112 slot=0, unaligned pointer, have 1954840805480 should be aligned to 4096
jnandi wrote:- 2023-07-08 09:57:52: BTRFS critical (device md127): corrupt node: root=1 block=808026112 slot=0, unaligned pointer, have 1954840805480 should be aligned to 4096
- 2023-07-08 09:57:51: BTRFS critical (device md127): corrupt node: root=1 block=808026112 slot=0, unaligned pointer, have 1954840805480 should be aligned to 4096
- 2023-07-08 09:57:49: BTRFS critical (device md127): corrupt node: root=1 block=808026112 slot=0, unaligned pointer, have 1954840805480 should be aligned to 4096
The safest (but most expensive) option is to use RAID recovery software that supports BTRFS. ReclaiMe is a popular package that folks here have used. You'd have to connect the disks to a Windows PC (likely needing USB docks or an enclosure), and also have a place to offload the data.
If you can connect a large enough USB disk to the NAS, you could also try offloading files using btrfs restore. Like RAID recovery software, it wouldn't attempt any repairs.
A far riskier option is to attempt to repair the file system:
btrfs check --repair --progress /dev/md127or
btrfs rescue chunk-recover -y /dev/md127Not sure how two repair methods differ - I've never needed to use either one.
If the data is important to you I suggest restore or RAID recovery software.
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