Dear Lars I tried but not work, the process is still hang when I trying to copy some data in source volume or do sync command after create the 4rd snapshot volume. should I patch the 8 and 9 of dm module? ftp://sources.redhat.com/pub/dm/patches/2.6-unstable/2.6.12-rc2/2.6.12-rc2-udm1/ I saw that some discuss in previous mail-list SportBear 2005/9/12, Lars Ellenberg <Lars.Ellenberg@linbit.com>: > / 2005-09-12 10:34:15 +0800 > \ Bear Wolf: > > Dear all > > > > I test snapshot function on my system. > > when I create the first snapshot, everything works fine. > > then I create more snapshot, everything works fine too. > > but when I access the source volume and do sync > > the sync command will be dead. > > > > and I test with a script file > > > > I=0 > > for I in 1 2 3 4 5 6 7 8 9 > > do > > cp -af /etc /mnt/volume1 > > lvcreate -s -L 64 -n snaplv${I} /dev/VG01/volume1 > > sleep 1 > > done > > > > after create the 4th sn apshot volume, the system process hang without > > any error message. > > lvcreate calls into device mapper. > it suspends the affected targets, changes "tables", creates new targets, > and resumes the targets again. > > if it fails to create the new targets, or fails to adjust the "tables", > > then it unfortunately aborts, leaving the existing targets in suspended > state. I think that is a bug. > > to get the system working (sort of) again, you could try to > for d in /dev/mapper/* ; do > [[ $d == control ]] && continue > dmsetup resume $d & > # ^^^ important! background it! > done > > background it, because if you "resume" some target that depends on some > other target in suspended state, it will hang and wait for that other > target to be resumed... doh. > > worked for me... (well, to get the system back, at least). > > see also dmsetup ls, dmsetup info, dmsetp table etc. > > cheers, > > -- > : Lars Ellenberg Tel +43-1-8178292-0 : > : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : > : Schoenbrunner Str. 244, A-1120 Vienna/Europe http://www.linbit.com : > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
