Bug#419209: lvm2: Hangs during snapshot creation

[Arthur de Jong]

On Thu, 2009-03-05 at 09:58 +0100, Klaus Ethgen wrote:
> Well, I did also some tests and wasn't able to trigger that bug on my
> laptop too. But I also have the lvm direct on the hard disk. On my
> server there is a md device underlying. So I suggest the problem is
> just with a lvm on top of a md device (which you see not that often on
> desktop systems).

FWIW, I have a similar setup and cannot reproduce this:

# uname -a
Linux bobo 2.6.26-1-amd64 #1 SMP Sat Jan 10 19:55:48 UTC 2009 x86_64 GNU/Linux

# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90
  Creation Time : Sun Apr 29 20:01:14 2007
     Raid Level : raid1
     Array Size : 58596992 (55.88 GiB 60.00 GB)
  Used Dev Size : 58596992 (55.88 GiB 60.00 GB)
[...]
    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1

# pvs
  PV         VG   Fmt  Attr PSize  PFree
  /dev/md0   main lvm2 a-   55.88G 9.88G

# lvs
  LV       VG   Attr   LSize   Origin Snap%  Move Log Copy%  Convert
  home     main -wi-ao  30.00G
  foo      main -wi-ao   6.00G
  root     main -wi-ao   2.00G
  squid    main -wi-ao   2.00G
  srv      main -wi-ao   2.00G
  swap     main -wi-ao   2.00G
  tmp      main -wi-ao 512.00M
  var      main -wi-ao   1.50G

# dmsetup table
main-squid: 0 4194304 linear 9:0 75497856
main-swap: 0 4194304 linear 9:0 7340416
main-root: 0 4194304 linear 9:0 384
main-foo: 0 8388608 linear 9:0 79692160
main-foo: 8388608 4194304 linear 9:0 104857984
main-tmp: 0 1048576 linear 9:0 11534720
main-var: 0 3145728 linear 9:0 4194688
main-srv: 0 4194304 linear 9:0 109052288
main-home: 0 62914560 linear 9:0 12583296

# lvcreate -s --size 2G -n foobar /dev/main/srv 
  Logical volume "foobar" created

-- 
-- arthur - adejong at debian.org - http://people.debian.org/~adejong --
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