* [linux-lvm] Dead PV....recovering data
@ 2006-07-11 4:59 Patrick Picard
2006-08-14 23:58 ` paddy
0 siblings, 1 reply; 2+ messages in thread
From: Patrick Picard @ 2006-07-11 4:59 UTC (permalink / raw)
To: linux-lvm
Good morning everyone.
I was away on vacation and when i got back, I booted my server up.
Unfortunately, one of the HD's didn't come back.
The hard drive was a WD4000YR 400GB.
PV /dev/hdb --> Hitachi 400GB
PV /dev/sdd --> WD4000YR 400GB (the dead one)
Both PV's were part of my Video Volume group.
Now that my WD hard drive is dead(not seen by bios at all :() the
videovg wont load.
Is it possible to recover the data on the remaining PV?
To my understanding, the data is stripped across the PV's in the volume
group.....
Right now im loosing around 570GB of videos :(
Thanks for any help
Patrick
To help outline my configuration see below. PV1 is the missing drive:
[root@fc4 backup]# cat /etc/lvm/backup/videovg
# Generated by LVM2: Tue Jan 31 18:55:29 2006
contents = "Text Format Volume Group"
version = 1
description = "Created *after* executing 'lvextend -l +95388
/dev/videovg/movieslv'"
creation_host = "fc4.patpic.com" # Linux fc4.patpic.com
2.6.14-1.1656_FC4smp #1 SMP Thu Jan 5 22:24:06 EST 2006 i686
creation_time = 1138751729 # Tue Jan 31 18:55:29 2006
videovg {
id = "mqumMs-fVhb-mOhv-KgEj-ZJqW-pWhD-3RDbQR"
seqno = 4
status = ["RESIZEABLE", "READ", "WRITE"]
extent_size = 8192 # 4 Megabytes
max_lv = 0
max_pv = 0
physical_volumes {
pv0 {
id = "bHJ1PS-yEg4-QlD0-D62k-nhyy-2TVe-b84gL0"
device = "/dev/hdb" # Hint only
status = ["ALLOCATABLE"]
pe_start = 384
pe_count = 95388 # 372.609 Gigabytes
}
pv1 {
id = "rH7yLu-aAoG-Gcc7-C2ZM-r2jP-lU1L-Cg8IsY"
// this is the bad drive
device = "/dev/sdc" # Hint only
status = ["ALLOCATABLE"]
pe_start = 384
pe_count = 95388 # 372.609 Gigabytes
}
}
logical_volumes {
movieslv {
id = "ijlCES-kuxY-YHnA-FlDo-cm7a-yYlO-cXHmga"
status = ["READ", "WRITE", "VISIBLE"]
segment_count = 2
segment1 {
start_extent = 0
extent_count = 95388 # 372.609 Gigabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv0", 0
]
}
segment2 {
start_extent = 95388
extent_count = 95388 # 372.609 Gigabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv1", 0
]
}
}
}
}
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [linux-lvm] Dead PV....recovering data
2006-07-11 4:59 [linux-lvm] Dead PV....recovering data Patrick Picard
@ 2006-08-14 23:58 ` paddy
0 siblings, 0 replies; 2+ messages in thread
From: paddy @ 2006-08-14 23:58 UTC (permalink / raw)
To: linux-lvm
On Tue, Jul 11, 2006 at 12:58:42AM -0400, Patrick Picard wrote:
> Good morning everyone.
>
> I was away on vacation and when i got back, I booted my server up.
> Unfortunately, one of the HD's didn't come back.
>
> The hard drive was a WD4000YR 400GB.
>
> PV /dev/hdb --> Hitachi 400GB
> PV /dev/sdd --> WD4000YR 400GB (the dead one)
>
> Both PV's were part of my Video Volume group.
>
> Now that my WD hard drive is dead(not seen by bios at all :() the
> videovg wont load.
> Is it possible to recover the data on the remaining PV?
>
> To my understanding, the data is stripped across the PV's in the volume
> group.....
which sounds *BAD* but see below
>
> Right now im loosing around 570GB of videos :(
>
> Thanks for any help
>
> Patrick
>
> To help outline my configuration see below. PV1 is the missing drive:
> [root@fc4 backup]# cat /etc/lvm/backup/videovg
> # Generated by LVM2: Tue Jan 31 18:55:29 2006
>
> contents = "Text Format Volume Group"
> version = 1
>
> description = "Created *after* executing 'lvextend -l +95388
> /dev/videovg/movieslv'"
>
> creation_host = "fc4.patpic.com" # Linux fc4.patpic.com
> 2.6.14-1.1656_FC4smp #1 SMP Thu Jan 5 22:24:06 EST 2006 i686
> creation_time = 1138751729 # Tue Jan 31 18:55:29 2006
>
> videovg {
> id = "mqumMs-fVhb-mOhv-KgEj-ZJqW-pWhD-3RDbQR"
> seqno = 4
> status = ["RESIZEABLE", "READ", "WRITE"]
> extent_size = 8192 # 4 Megabytes
> max_lv = 0
> max_pv = 0
>
> physical_volumes {
>
> pv0 {
> id = "bHJ1PS-yEg4-QlD0-D62k-nhyy-2TVe-b84gL0"
> device = "/dev/hdb" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 95388 # 372.609 Gigabytes
> }
>
> pv1 {
> id = "rH7yLu-aAoG-Gcc7-C2ZM-r2jP-lU1L-Cg8IsY"
> // this is the bad drive
> device = "/dev/sdc" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 95388 # 372.609 Gigabytes
> }
> }
>
> logical_volumes {
>
> movieslv {
> id = "ijlCES-kuxY-YHnA-FlDo-cm7a-yYlO-cXHmga"
> status = ["READ", "WRITE", "VISIBLE"]
> segment_count = 2
>
> segment1 {
> start_extent = 0
> extent_count = 95388 # 372.609 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 0
> ]
> }
> segment2 {
> start_extent = 95388
> extent_count = 95388 # 372.609 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv1", 0
> ]
> }
> }
> }
> }
If I read this correctly, your volume is spanned, and given an assumption of
reasonable contiguity of files you should be able to recover a good deal
from your remaining drive.
Off the top of my head, I don't recall the right way to do this, but
hopefully someone will chime in with the right answer, otherwise I'll
see if I can think of it tomorrow or so :-)
Regards,
Paddy
--
Perl 6 will give you the big knob. -- Larry Wall
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2006-07-11 4:59 [linux-lvm] Dead PV....recovering data Patrick Picard
2006-08-14 23:58 ` paddy
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