LVM2 - Crash

[Vincent Carpier - Comite Reseaux des Universites <vincent.carpier@cru.fr>]

Hello,

I have a big problem with LVM2 (FC2) and the snapshot on a Dell PE1650 or Dell PE1750 (strangely not on a Dell GX240).
The host is frozen after 3 snapshot.

A bug ??

------------
Essai FC2 sur PE1750
no raid

install + upgrade

/dev/sda1 38G 292M 36G 1% /
/dev/mapper/vg0-home 9.7G 33M 9.1G 1% /home
/dev/mapper/vg0-usr 5.8G 1.1G 4.5G 19% /usr
/dev/mapper/vg0-var 2.0G 206M 1.7G 11% /var

2.6.8-1.521smp
lvm2-2.00.15-2

[root@auto1 /]# lvscan
ACTIVE '/dev/vg0/home' [9.77 GB] next free (default)
ACTIVE '/dev/vg0/usr' [5.86 GB] next free (default)
ACTIVE '/dev/vg0/var' [1.95 GB] next free (default)

[root@auto1 /]# lvcreate -L500M -s -n snap1 /dev/vg0/var
Logical volume "snap1" created

commande : lvscan et lvdisplay, mount snap -> ok

Deuxiéme snapshot

[root@auto1 /]# lvscan
ACTIVE '/dev/vg0/home' [9.77 GB] next free (default)
ACTIVE '/dev/vg0/usr' [5.86 GB] next free (default)
ACTIVE Original '/dev/vg0/var' [1.95 GB] next free (default)
ACTIVE Snapshot '/dev/vg0/snap1' [500.00 MB] next free (default)
ACTIVE Snapshot '/dev/vg0/snap2' [500.00 MB] next free (default)

commande : lvscan et lvdisplay, mount snap -> ok

Troisiéme snapshot

[root@auto1 /]# lvscan
ACTIVE '/dev/vg0/home' [9.77 GB] next free (default)
ACTIVE '/dev/vg0/usr' [5.86 GB] next free (default)
ACTIVE Original '/dev/vg0/var' [1.95 GB] next free (default)
ACTIVE Snapshot '/dev/vg0/snap1' [500.00 MB] next free (default)
ACTIVE Snapshot '/dev/vg0/snap2' [500.00 MB] next free (default)
ACTIVE Snapshot '/dev/vg0/snap3' [500.00 MB] next free (default)

  freeze !!

no log, no message on the console, possibilité de commande tel que ls, df, ps
j'essai de stopper le process lvscan -> impossible (état : D uninterruptible sleep (usually IO))

Try to remove snap : lvremove /dev/vg0/snapx -> freeze

Crash

-- 
       Vincent Carpier
Comité Réseau des Universités
      http://www.cru.fr
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