Am 22.11.2017 um 22:10 schrieb Michael Lyle:

On 11/22/2017 01:07 PM, Stefan Priebe - Profihost AG wrote:

quoted

default debian jessie version:
# blkid -v
blkid from util-linux 2.25.2  (libblkid 2.25.0, 24-Oct-2014)

OK, so it's ancient.

One other thing that can get you-- if there was ever an xfs or other
filesystem on this disk -without- bcache, then you created bcache & xfs
on it without wipefs... the old superblock can still be hanging around
and not having happened to been rewritten.

no there shouldn't eb ever an xfs without it on disk - but i can't
guarantee that.

To reproduce the isue you need the first 10MB of the disk.

See below:

Still ok:

# dd if=/dev/sdf1 of=/tmp/8k bs=8M count=1
1+0 records in
1+0 records out
8388608 bytes (8,4 MB) copied, 0,01318 s, 636 MB/s
# /sbin/blkid -o udev -p /tmp/8k
ID_FS_UUID=65811163-4ffc-4823-ad72-bae10ce85b63
ID_FS_UUID_ENC=65811163-4ffc-4823-ad72-bae10ce85b63
ID_FS_TYPE=bcache
ID_FS_USAGE=other

not anymore:

# dd if=/dev/sdf1 of=/tmp/8k bs=10M count=1
1+0 records in
1+0 records out
10485760 bytes (10 MB) copied, 0,0115798 s, 906 MB/s
# /sbin/blkid -o udev -p /tmp/8k
ID_FS_AMBIVALENT=other:bcache other:xfs_external_log

Stefan

Mike

quoted

quoted

Mike
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