[linux-lvm] Replace defective disc from non RAID LVM
Asgeir Ingebrigtsen
philos at nvg.ntnu.no
Tue Jan 17 20:40:51 UTC 2006
Made it, but it sereously should say somwhere that the procedure is quite
simple.
When old disc dies _DO NOT TOUCH LVM_ before new disc arrives.
(This means do not attempt to reduce the lvm to match the disc thats lost
or do anything to LVM metadata)
Note ID on old disc.
Remove old defective disc.
Add new disc of same size or larger. (i had same size here)
pvcreate --uuid (same ID as old disc) --restorefile
/location.of.last.metadata.backup.
vgchange -a y
Run reiserfsck --rebuild-tree on the vg
After some time, the LVM is then fixed, and comes up with most of the data
intact, except the data that were lost on the defective disc. And there
will be some cleaning up to do in the lost+found directory. I lost 125G
when the disc was 120G.
Then mount the LVM and be happy, i am :)
Asgeir
On Tue, 10 Jan 2006, Asgeir Ingebrigtsen wrote:
>
> Hi!
>
> This question has probably been answered a few times, but it's prooving
> difficult to get a definitive answer from google, the howto or the mailing
> lists.
>
> Anyone want to help me?
>
> The situation:
>
> I've got a 2T LVM consisting of 14 individual IDE discs of varying sizes.
> There is no raid or mirroring.
> I'm not sure of the configuration (striped or other) but will include the
> "metadata" later in this email. I just set it up, and have been forced to
> fill it up everytime a disc died on me (something allways went wrong
> trying to restore). Not a big problem, but a bit tidious ;)
>
> Now, a disc have died on me again, a 120G disc, and the question is:
>
> How can i restore the whole LVM minus the data on the 120G disc?
>
> I'll loose 120G or more, but would like to keep whatever
> possible.
>
> The file system used is reiserfs, the files are mainly large 300mb+ files,
> i have not run any filesystem checks after the disk failed, i would like a
> step by step guide if possible :)
>
> METADATA:
>
> # Generated by LVM2: Mon Oct 3 19:01:03 2005
>
> contents = "Text Format Volume Group"
> version = 1
>
> description = "Created *after* executing 'lvextend -L+672G /dev/vg1/lv1'"
>
> creation_host = "philos" # Linux philos 2.4.26-1-686-smp #1 SMP Tue Aug 24 13:53:22 JST 2004 i686
> creation_time = 1128358863 # Mon Oct 3 19:01:03 2005
>
> vg1 {
> id = "6t7WDD-LNua-VKM4-L0xS-Sr5J-snmU-DGozOI"
> seqno = 8
> status = ["RESIZEABLE", "READ", "WRITE"]
> extent_size = 33554432 # 16 Gigabytes
> max_lv = 0
> max_pv = 0
>
> physical_volumes {
>
> pv0 {
> id = "X1ZHJP-Su7u-8De3-JmA5-cIkT-sw5H-7oDU0G"
> device = "/dev/hdb" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 7 # 112 Gigabytes
> }
>
> pv1 {
> id = "G8w4tV-sPzm-b42d-QSfY-0RJ5-04wx-Y00BBo"
> device = "/dev/hdc" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 5 # 80 Gigabytes
> }
>
> pv2 {
> id = "2OS2Du-RxsO-fPtK-Khtx-yc9M-McIt-eKMIFD"
> device = "/dev/hdd" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 4 # 64 Gigabytes
> }
>
> pv3 {
> id = "DTmd0o-vxQm-LwGX-VgtF-ntOX-Nw4j-sMdz20"
> device = "/dev/hdh" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 9 # 144 Gigabytes
> }
>
> pv4 {
> id = "rvt9Tm-36Hq-NLZ7-FLwR-3Hxc-9sZZ-sLxt53"
> device = "/dev/hdf" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 9 # 144 Gigabytes
> }
>
> pv5 {
> id = "rAmS3s-yD0F-WZF5-Wi9Z-ejbe-edTF-CUhdvU"
> device = "/dev/hdg" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 9 # 144 Gigabytes
> }
>
> pv6 {
> id = "6vd1kF-O2CH-Zrmb-O19b-7T9L-jHXi-rmYMxB"
> device = "/dev/hdi" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 6 # 96 Gigabytes
> }
>
> pv7 {
> id = "DFVJxw-mAvr-B0Gx-Ck5w-90db-ZWiS-vaK5Au"
> device = "/dev/hdj" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 6 # 96 Gigabytes
> }
>
> pv8 {
> id = "Cokdd5-LEN9-DZUr-Mmk6-Q0jF-nZCn-eSonf8"
> device = "/dev/hdk" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 6 # 96 Gigabytes
> }
>
> pv9 {
> id = "41fnQg-jitr-qJ6z-4Aes-4gd9-oTZL-X8ujZF"
> device = "/dev/hdl" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 9 # 144 Gigabytes
> }
>
> pv10 {
> id = "2r7VTJ-dXWv-33U4-rv2j-71ib-bGV2-0g4Y1q"
> device = "/dev/cdrom" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 11 # 176 Gigabytes
> }
>
> pv11 {
> id = "XIZ6Ch-0rw4-4OIy-8IzW-0lko-k5ea-psWYhO"
> device = "/dev/hdm" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 14 # 224 Gigabytes
> }
>
> pv12 {
> id = "T1taAR-qp0L-Ao26-k9cK-UUfu-yLZB-EbLBOP"
> device = "/dev/hdn" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 14 # 224 Gigabytes
> }
>
> pv13 {
> id = "ifZOsO-3va6-LNgl-oH42-OOdr-75Nz-E5h5HJ"
> device = "/dev/hdo" # Hint only
>
> status = ["ALLOCATABLE"]
> pe_start = 384
> pe_count = 14 # 224 Gigabytes
> }
> }
>
> logical_volumes {
>
> lv1 {
> id = "a6tDgq-JBDo-MuIx-20n8-6h5o-mgCF-rDt2bW"
> status = ["READ", "WRITE", "VISIBLE"]
> segment_count = 14
>
> segment1 {
> start_extent = 0
> extent_count = 7 # 112 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 0
> ]
> }
> segment2 {
> start_extent = 7
> extent_count = 5 # 80 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv1", 0
> ]
> }
> segment3 {
> start_extent = 12
> extent_count = 4 # 64 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv2", 0
> ]
> }
> segment4 {
> start_extent = 16
> extent_count = 9 # 144 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv3", 0
> ]
> }
> segment5 {
> start_extent = 25
> extent_count = 9 # 144 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv4", 0
> ]
> }
> segment6 {
> start_extent = 34
> extent_count = 9 # 144 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv5", 0
> ]
> }
> segment7 {
> start_extent = 43
> extent_count = 6 # 96 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv6", 0
> ]
> }
> segment8 {
> start_extent = 49
> extent_count = 6 # 96 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv7", 0
> ]
> }
> segment9 {
> start_extent = 55
> extent_count = 6 # 96 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv8", 0
> ]
> }
> segment10 {
> start_extent = 61
> extent_count = 9 # 144 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv9", 0
> ]
> }
> segment11 {
> start_extent = 70
> extent_count = 11 # 176 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv10", 0
> ]
> }
> segment12 {
> start_extent = 81
> extent_count = 14 # 224 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv11", 0
> ]
> }
> segment13 {
> start_extent = 95
> extent_count = 14 # 224 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv12", 0
> ]
> }
> segment14 {
> start_extent = 109
> extent_count = 14 # 224 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv13", 0
> ]
> }
> }
> }
> }
>
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