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Hi,
I'm quite new to LVM and I think to have a quite simple problem, but I
can not find a clear answer to it and, since it is a quite critical
problem, I'm asking to you for the right solution before messing up
everything.
I have an LVM volume made by two raid sda and sdb, with an XFS
filesystem on it; sda had a failure and its data is completely lost...
what I would like to do is to restore at least what is contained in sdb.
(The situation displayed by "lvdisplay -mP" is reported at the end of
this mail).
I tried this command: "vgchange -P -a y raid", but the device
/dev/raid/data does not exist and the /dev/mapper/raid-data I used to
mount the volume seems to be not accessible:
# xfs_check /dev/mapper/raid-data
xfs_check: /dev/mapper/raid-data is invalid (cannot read first 512 bytes)
Is the data contained in sdb recoverable? (as far as I understood, it
should) And if it is the case, which should be the right procedure to
restore it?
Thanks in advance for your help.
Enrico
# lvdisplay -mP
Partial mode. Incomplete volume groups will be activated read-only.
/dev/sda: read failed after 0 of 4096 at 0: Input/output error
/dev/sda: read failed after 0 of 4096 at 0: Input/output error
/dev/sda: read failed after 0 of 4096 at 19989989883904: Input/output
error
/dev/sda: read failed after 0 of 4096 at 19989989941248: Input/output
error
/dev/sda: read failed after 0 of 4096 at 0: Input/output error
/dev/sda: read failed after 0 of 4096 at 4096: Input/output error
/dev/sda: read failed after 0 of 4096 at 0: Input/output error
Couldn't find device with uuid 'AkLdC5-wPgi-hDbv-Sqf3-2wBv-hBzu-2OhDaQ'.
/dev/sda: read failed after 0 of 4096 at 0: Input/output error
/dev/sda: read failed after 0 of 4096 at 0: Input/output error
Couldn't find device with uuid 'AkLdC5-wPgi-hDbv-Sqf3-2wBv-hBzu-2OhDaQ'.
--- Logical volume ---
LV Name /dev/raid/data
VG Name raid
LV UUID 4rjFt7-ZuQX-f3n4-iDVR-2gJv-5cFf-77gG5f
LV Write Access read/write
LV Status available
# open 0
LV Size 36.36 TB
Current LE 9531968
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:0
--- Segments ---
Logical extent 0 to 4765983:
Type linear
Physical volume unknown device
Physical extents 0 to 4765983
Logical extent 4765984 to 9531967:
Type linear
Physical volume /dev/sdb1
Physical extents 0 to 4765983
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