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. result of ps ------------------------------------------------------------ 2259 pts/1 S+ 0:00 bash test.sh 2267 ? S 0:00 [xfssyncd] 2278 ? S< 0:00 [kcopyd] 2318 pts/1 D+ 0:00 cp -af /etc /mnt/volume1/etc5 log of create the 4th snapstot volume ---------------------------------------------------- Setting chunksize to 16 sectors. Finding volume group "VG01" Creating logical volume snaplv4 Creating volume group backup "/etc/lvm/backup/VG01" (seqno 9). Found volume group "VG01" Loading VG01-snaplv4 Zeroing start of logical volume "snaplv4" Found volume group "VG01" Removing VG01-snaplv4 Found volume group "VG01" Found volume group "VG01" Found volume group "VG01" Loading VG01-snaplv1-cow Loading VG01-volume1-real Loading VG01-snaplv1 Loading VG01-snaplv3-cow Loading VG01-snaplv3 Loading VG01-snaplv4-cow Loading VG01-snaplv4 Loading VG01-snaplv2-cow Loading VG01-snaplv2 Loading VG01-volume1 Creating volume group backup "/etc/lvm/backup/VG01" (seqno 10). Logical volume "snaplv4" created resultof lvscan ----------------------- ACTIVE Original '/dev/VG01/volume1' [128.00 MB] inherit ACTIVE Snapshot '/dev/VG01/snaplv1' [64.00 MB] inherit ACTIVE Snapshot '/dev/VG01/snaplv2' [64.00 MB] inherit ACTIVE Snapshot '/dev/VG01/snaplv3' [64.00 MB] inherit ACTIVE Snapshot '/dev/VG01/snaplv4' [64.00 MB] inherit dmesg and messages has no error. is this a known issue of snapshot? Kernel 2.6.13 LVM version: 2.01.14 (2005-08-04) Library version: 1.01.04 (2005-08-02) Driver version: 4.4.0 Thanks. SportBear _______________________________________________ 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/