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xen-users
Re: [Xen-users] Domain-0 freezes when mounting a cloned domU with dd
Franck ELIE a écrit :
Hi
When cloning à domU with 'dd' command (after a domU shutdown), it
seems to be very important to perform a 'fsck' on cloned partitions
before to mount because if we don't, it freezes Domain-0 and next dom-U.
Just before the kernel froze, logs are full of such message :
kernel:
>>ext3_orp>ext3_orph>ext3_orph>ext3_orph>ext3_orpha>ext3_orp>ext3_orpha>ext3_or>ext3_or>ext3_orph>e
xt3_orp>ext3_orp>ext3_orph>ext3_or>ext3_orpha>ext3_or>ext3_orp>ext3_or>ext3_orp>ext3_orph>ext3_orpha>ext3_or>ext3_orp>ext3_orp>ext3_
or>ext3_orphan>ext3_orphan_>ext3_orpha>ext3_orp>ext3_orp>ext3_orph>ext3_orphan>ext3_orp>ext3_orp>ext3_orph>
....
Note that when performing a fdisk on such partitions I obtain this
output :
# fsck.ext3 /dev/mapper/CMS1
e2fsck 1.40-WIP (14-Nov-2006)
/dev/mapper/CMS1: recovering journal
Truncating orphaned inode 32474 (uid=101, gid=104, mode=0140777, size=0)
/dev/mapper/CMS1: clean, 37928/221312 files, 250275/441779 blocks
By the way, fsck on the template domU seems to be OK.
So, here are my questions :
- Do you know why is it necessary to perform fsck ? Should I use
specific options with dd to avoid this effect on the cloned FS ?
- Concerning the kernel freeze (that seems not to be specific to my
distrib or xen), is it a kernel bug ?
Regards
Franck
P.S.: xen 3.03, kernel 2.6.18-4-xen-686, Debian Etch, 1 domU per LUN
of 2Go, no LVM
Here are the result of tests I just performed to understand what 's wrong :
- there is a MD5 difference between the sum computed from LUN of the
domU storage and the image file generated with 'dd' WHEN the backup is
performed just after the domU shutdown (less than 3min).
- domain-0 have enough memory (8Go) to copy the domU (2Go)
So, my FS trouble would to be related with a partial copy of domU that
seems to be performed with 'dd' before before the end of the memory
flush away to disk domU.
So do you know how to perform the memory flush related to a domU in
order to backup the disk correctly ?
Any suggestion would be appreciate
Regards
Franck
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