Strange snapshots behavior in dev/<vg>/
hi,
to manage backups from Xen DomUs, I create snapshots from every guest. They're all running under Debian Etch. No problem at all, normally, but ... see yourself:
My script creates only snapshots and mounts them, nothing more.
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root@henrietta ~ # /usr/local/bin/snap-mount.sh
Logical volume "angelica-disk-snap" successfully removed Logical volume "hitomi-disk-snap" successfully removed Logical volume "rico-disk-snap" successfully removed Logical volume "triela-disk-snap" successfully removed Logical volume "zoe-disk-snap" successfully removed
Logical volume "angelica-disk-snap" created/dev/neko/angelica-disk
Logical volume "hitomi-disk-snap" created/dev/neko/hitomi-disk
Logical volume "rico-disk-snap" created/dev/neko/rico-disk
Logical volume "triela-disk-snap" created/dev/neko/triela-disk
Logical volume "zoe-disk-snap" created/dev/neko/zoe-disk
root@henrietta ~ # ls /media/backup/angelica-disk/dev/neko/ hitomi-disk
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So, first question, why i have the name from a different volume (hitomi-disk) in the dev from angelica?
root@henrietta ~ # ls /media/backup/hitomi-disk/dev/neko
ls: /media/backup/hitomi-disk/dev/neko: Input/output error
Why i get here an error?
any suggestions?
root@henrietta ~ # uname -a
Linux henrietta 2.6.16.33-xen #1 SMP Mon Jan 8 14:39:02 GMT 2007 i686 GNU/Linux
root@henrietta ~ # dpkg -l | grep lvm
ii lvm-common 1.5.20 The Logical
Volume Manager for Linux (common
ii lvm2 2.02.06-4 The Linux
Logical Volume Manager
root@henrietta ~ # dpkg -l | grep udev
ii udev 0.105-4 /dev/ and
hotplug management daemo
LV display:
--- Logical volume ---
LV Name /dev/neko/hitomi-disk
VG Name neko
LV UUID Tes7KH-pnv5-IGNt-vdf5-yCni-wSTo-dBd8ul
LV Write Access read/write
LV snapshot status source of
/dev/neko/hitomi-disk-snap [active]
LV Status available
# open 1
LV Size 1.00 GB
Current LE 256
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:2--- Logical volume ---
LV Name /dev/neko/hitomi-disk-snap VG Name neko LV UUID DIeQ81-Oeao-j9gt-RoRL-4G5L-0xko-Z5W9vN LV Write Access read/write LV snapshot status active destination for /dev/neko/hitomi-disk LV Status available # open 1 LV Size 1.00 GB Current LE 256 COW-table size 1.00 GB COW-table LE 256 Allocated to snapshot 0.07% Snapshot chunk size 8.00 KB Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:25
--- Logical volume ---
LV Name /dev/neko/angelica-disk
VG Name neko
LV UUID 72Ibgz-WlBX-x0G2-6HlQ-MgB2-UOd2-n3aXSq
LV Write Access read/write
LV snapshot status source of
/dev/neko/angelica-disk-snap [active]
LV Status available
# open 1
LV Size 4.00 GB
Current LE 1024
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:10--- Logical volume ---
LV Name /dev/neko/angelica-disk-snap VG Name neko LV UUID fclDHb-U9Xb-wWQc-ptFH-jrNg-mNou-qzinbe LV Write Access read/write LV snapshot status active destination for /dev/neko/angelica-disk LV Status available # open 1 LV Size 4.00 GB Current LE 1024 COW-table size 1.00 GB COW-table LE 256 Allocated to snapshot 0.09% Snapshot chunk size 8.00 KB Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:21
cu denny
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Quoted 2 lines · Denny Schierz
root@henrietta ~ # ls /media/backup/angelica-disk/dev/neko/ hitomi-disk
Why would you do this? device nodes in your backup still just point to the device. I suggest mounting your backup volumes with -o nodev,noexec both to prevent possible security problems and to make it clear that the above isn't useful.
Quoted 4 lines
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So, first question, why i have the name from a different volume (hitomi-disk) in the dev from angelica?
Because hitomi-disk is the one that happens to be online at the moment.
Quoted 4 lines
root@henrietta ~ # ls /media/backup/hitomi-disk/dev/neko
ls: /media/backup/hitomi-disk/dev/neko: Input/output errorWhy i get here an error?
Because there isn't a disk online at the moment.
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