Hi,
I have a small SSD in my Ubuntu 14.04 system which is mostly allocated
to an LVM physical volume. I had 25GB free on that physical volume so I
thought I'd try using it as a bcache cache for my HDD. I create a new
LVM logical volume, which left things looking like this:
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 VG4 lvm2 a-- 53.57g 0
/dev/sdb2 VG6 lvm2 a-- 2.69t 0
# lvs
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert
VG4-usr VG4 -wi-ao-- 19.31g
VG4-var VG4 -wi-ao--- 9.31g
bcache VG4 -wi-ao--- 24.95g
home VG6 -wi-ao--- 2.69t
I then did:
# make-bcache -C /dev/mapper/VG4-bcache
The system immediately locked up completely. (So the above is a
reconstruction, I don't have the actual command I executed any more,
although I am 99% certain that's exactly the command executed.)
The system came up OK again after hitting the reset button.
I don't know if this counts as a bug or if it's just a "don't do that,
then" situation, but a) is this a supported use case? b) if it's not,
would there be any possibility of make-bcache giving an error instead of
causing a lock up?
Kernel version as reported by uname -a is:
Linux riemann 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux
I am using the bcache-tools 1.0.8-1 package from the ppa:g2p/storage
Ubuntu PPA repository.
If you would like any further information please let me know.
Cheers.
Steve
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