Hi, I got a server with Tyan5350 mainboard and 8GB ECC RAM. And it seem that snapshot didn't work in either LVM1 or LVM2 when the memory over 4GB is plugged. We have HIGHMEM64G=y kernel option been set. Everything is ok when the comination is "snapshot + 4GB RAM" or "no snapshot + 8GB RAM"... Any clues? PS: Hope you could understand my question, english is not my mother language. :(
1. in linux-2.4.27 + LVM-1.0.8, it failed to activate the VG with any existed snapshot volume. bash-2.03# vgchange -ay vgchange -- ERROR "Bad address" activating volume group "storage"
2. And again, in linux-2.4.27 + LVM-1.0.8, it failed to create snapshot
volume.
bash-2.03# lvcreate -A n -s -n test_snap -l 16 /dev/storage/test
lvcreate -- WARNING: the snapshot will be automatically disabled once it gets full
lvcreate -- INFO: using default snapshot chunk size of 64 KB for "/dev/storage/test_snap"
lvcreate -- ERROR "Cannot allocate memory" creating VGDA for "/dev/storage/test_snap" in kernel
3. Then I turn to test linux-2.6.10 + LVM2. This time I can create a snapshot and it work well until
I reboot the system. The system will crash when I try to make a tarfile over the original volume.
bash-2.03# lvm version LVM version: 2.00.31 (2004-12-12) Library version: 1.00.19-ioctl (2004-07-03) Driver version: 4.3.0 bash-2.03# lvm lvscan ACTIVE Original '/dev/storage/test' [1.95 GB] inherit ACTIVE '/dev/storage/xfs' [1.95 GB] inherit ACTIVE Snapshot '/dev/storage/test_snap' [500.00 MB] inherit ACTIVE '/dev/storage/sysvolume' [2.44 GB] inherit bash-2.03# tar cvf /mnt/xfs/test.tar /mnt/test a /mnt/test/ directory a /mnt/test/ACARD101RC3.iso 67534848 bytes, 131904 tape blocks ===>SYSTEM CRASHED!!...... system halt and the last line of messages on screen is: <0>Kernel panic - not syncing: Fatal execption in interrupt
It's interesting to mention that the snapshot work well before reboot. Seem it is kind of problem relate to VFS cache, snapshot and HIGHMEM support?
-- Mozo Hu. mozo@coventive R&D Assistant Manager, Coventive Advance Technologies
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