Skip to contentSkip to conversation

blkid always detects FS

DISCUSSION Stefan Priebe - Profihost AG 2 participants 3 messages Aug 27, 2013 bcache (block layer cache)

lore
Share & tools
lore
#0 lore raw

Hi,

since commit 0b57e166ae86d525ef42842cabf7692fc7c44039 in bcache tools all my bcache devices do not register anymore.

For all my bcache devices blkid returns:

# /sbin/blkid -o udev /dev/sdd1
ID_FS_UUID=6937d2e6-c8e3-4590-954b-65937fc23a52
ID_FS_UUID_ENC=6937d2e6-c8e3-4590-954b-65937fc23a52
ID_FS_TYPE=xfs

What's wrong here? All disks have XFS on top of bcache running.

Greets,
Stefan

#1 lore raw
Quoted 8 lines · Stefan Priebe - Profihost AG

For all my bcache devices blkid returns:

# /sbin/blkid -o udev /dev/sdd1
ID_FS_UUID=6937d2e6-c8e3-4590-954b-65937fc23a52
ID_FS_UUID_ENC=6937d2e6-c8e3-4590-954b-65937fc23a52
ID_FS_TYPE=xfs

What's wrong here? All disks have XFS on top of bcache running.

The udev rules were changed to reject bcache devices with a pre-existing superblock (xfs in your case).

This was done to fail early when there's a risk of exposing an unsynchronised backend device, which would be a bad thing™.

You can remove the stray superblocks with wipefs.

#2 lore raw

Am 27.08.2013 13:59, schrieb Gabriel de Perthuis:

Quoted 10 lines · Stefan Priebe - Profihost AG
Quoted 8 lines

For all my bcache devices blkid returns:

# /sbin/blkid -o udev /dev/sdd1
ID_FS_UUID=6937d2e6-c8e3-4590-954b-65937fc23a52
ID_FS_UUID_ENC=6937d2e6-c8e3-4590-954b-65937fc23a52
ID_FS_TYPE=xfs

What's wrong here? All disks have XFS on top of bcache running.

Quoted 7 lines

The udev rules were changed to reject bcache devices with a pre-existing superblock (xfs in your case).

This was done to fail early when there's a risk of exposing an unsynchronised backend device, which would be a bad thing™.

You can remove the stray superblocks with wipefs.

shouldn't bcache-create wipe the superblock?
Stefan