Hi,
(The purpose of this "exercise" is to implement a backup strategy.)
I created PVs then an LV on a pair of drives in a USB dual
enclosure, created the FS, backed up my data, umounted the fs, and
disconnected/powered down the enclosure.
Upon powering it back up/reconnecting it, I did vgscan, vgchange,
mount, but got IO and "unable to read superblock" errors.
Rebooting, even with the external drives disconnected, made things
all better (though I did have to do an lvchange -a y).
***** START ******
# vgscan
WARNING: Ignoring duplicate config node: filter (seeking filter)
Reading all physical volumes. This may take a while...
/dev/dm-1: read failed after 0 of 4096 at 2000380952576:
Input/output error
/dev/dm-1: read failed after 0 of 4096 at 2000381009920:
Input/output error
/dev/dm-1: read failed after 0 of 4096 at 0: Input/output error
/dev/dm-1: read failed after 0 of 4096 at 4096: Input/output error
/dev/dm-1: read failed after 0 of 4096 at 0: Input/output error
Found volume group "backup_vg" using metadata type lvm2
Found volume group "main_huge_vg" using metadata type lvm2
# vgchange -a y backup_vg
WARNING: Ignoring duplicate config node: filter (seeking filter)
/dev/dm-1: read failed after 0 of 4096 at 0: Input/output error
1 logical volume(s) in volume group "backup_vg" now active
# mount -v /mnt/backups
mount: wrong fs type, bad option, bad superblock on
/dev/mapper/backup_vg-backup_lv,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
[28722.859373] EXT4-fs: unable to read superblock
[28722.859458] EXT3-fs: unable to read superblock
***** STOP *****
Any thoughts on getting lvm2 to play nice with dynamic devices?
Thanks
--
Scooty Puff, Sr
The Doom-Bringer
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