external btrfs partitions won't mount as different devices
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| btrfs-tools (Ubuntu) |
New
|
Undecided
|
Unassigned | ||
Bug Description
Binary package hint: btrfs-tools
I have formatted an external drive as btrfs. The first time I mount it, eg as /dev/sdb1, it mounts fine. But after that, it will only remount as /dev/sdb1
The test case is:
* Mount the btrfs drive.
* Unmount and unplug the btrfs drive
* Plug another external drive in so it takes over as /dev/sdb1
* Plug the btrfs drive back in so it becomes /dev/sdc1
* Try to mount the btrfs drive.
It always fails to mount, either from nautilus or from the command line (eg sudo mount /dev/sdc1 /some_folder). The error indicates that the system cannot read the superblock.
If I reverse the process so that the btrfs drive once again is /dev/sdb1, it mounts correctly, so it appears to be caching the /dev/sdb1 information somewhere.
If I reboot so that the the second drive is /dev/sdb1 and the btrfs drive is /dev/sdc1, the btrfs drive mounts correctly.
The same occurs if the btrfs drive is initially mounted as another device, eg /dev/sde1; after this it will only mount as /dev/sde1.
Version info:
* I've tried on Ubuntu 9.10 with kernel 2.6.33 and btrfs-tools v 0.19-5ubuntu0.
* I've tried Ubuntu 10.04 with kernel 2.6.32 and btrfs-tools v 0.19.3
| TheBeaver (banche) wrote | #1 |
| tags: | added: karmic lucid |
| Rocko (rockorequin) wrote | #2 |
I have it on 10.04 with kernel 2.6.32-
I made a FS on an LVM volume. It mounted fine and I put data on it. After that, I renamed the logical volume and it would not mount. After I renamed it back to it's original name it did mount fine.
The error indicates that the system cannot read the superblock too.
I did NOT try to reboot after renaming, to see if it's just some system caching or whatever... I will try it and let you know.
Thank you.