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paddlaren
Tux's lil' helper
Joined: 23 Nov 2005
Posts: 126
Location: Hörby, Sweden
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 Posted: Sun Sep 30, 2007 6:51 am Post subject: LVM2 seems to work but I cannot mouont the snapshots |
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Hi!
I use lvm2 for my /home since I like to use the snapshots for backing up the entire system. This have been working quite a while but now it doesn't.
I can create the volume and snapshot with no messages I relate to errors but I cannot mount the snapshot.
When I create the snapshot I get:
| Code: |
root:~/lvmsetup#lvcreate -L17G -s -n home_backup /dev/lvm_home/home
LV lvm_home/home_backup in use: not deactivating
Couldn't deactivate new snapshot.
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When I tries to mount:
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root:~/lvmsetup#mount /dev/lvm_home/home_backup /mnt/mnt/
mount: you must specify the filesystem type
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and when I mount with -t reiserfs I get "error in superblock" or simlar and a message in dmesg:
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SQUASHFS error: Can't find a SQUASHFS superblock on dm-1
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| Code: |
root:~/etc#uname -a
Linux xxxxx 2.6.22-gentoo-r5 #6 SMP PREEMPT Thu Sep 27 19:00:22 CEST 2007 i686 AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ AuthenticAMD GNU/Linux
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Please help, what can gone wrong?
Regards,
Erik |
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geeojr
n00b
Joined: 11 Feb 2003
Posts: 15
Location: Missouri, USA
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| Posted: Fri Oct 05, 2007 2:08 am Post subject: Dirty Work Around |
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Given the relative lack of solutions to this topic (here and elsewhere), it seems appropriate to share what little I've come up with. Knowing little more than there being a race condition of "some sort" between LVM and udev, I came up with this quick (and dirty) workaround which I believe just takes udev out of the mix.
In /etc/udev/rules.d/64-device-mapper.rules
Change the line:
| Code: | | KERNEL!="dm-*", GOTO="device_mapper_end" |
To Read:
| Code: | KERNEL=="dm-*", GOTO="device_mapper_end"
KERNEL!="dm-*", GOTO="device_mapper_end" |
I know this generally defeats all purpose; but this cured my snapshot delima - while I've noticed no other consequences with this change, use at your own risk.
Good Luck! |
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