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Re: [linux-lvm] /dev/vg1/dir-1: read failed after 0 of 4096 at ...
From: Tero &termant gmail com&
To: &Ubuntu user technical support, not for general discussions& &ubuntu-users lists ubuntu com&
Cc: linux-lvm redhat com
Subject: Re: [linux-lvm] /dev/vg1/dir-1: read failed after 0 of 4096 at ...
Date: Wed, 30 May :14 +0300
On 30.5., Tero wrote:
& I really messed up my LVM settings. I am using Ubuntu 10.04 server and
& my updates were up-to-date. Here is the whole story:
& 1. I have got four (4) identical 320 GB hard disks: &/dev/sda&,
& &/dev/sdb&, &/dev/sdc& and &/dev/sdd& and one (1) 1 TB &/dev/sde&.
& 2. Each 320 GB disk is paritioned to 1 GB + 319 GB (&/dev/sdX1& and
& &/dev/sdX2&) and 1 TB disk has only one 1 TB parition.
& 3. There is RAID-1 (/dev/md0) on the &/dev/sdX1& paritions and RAID-5
& (/dev/md1) on the &/dev/sdX2& partions.
& 4. LVM volume group &vg1& was set at first only on /dev/md1.
& 5. On vg1 there was only logical volumes: &root&, &dir-1& and &dir-2&.
& 6. Later I attached hard disk /dev/sde and attached it to volume group &vg1&
& 7. I created logical volume drbd with command something like &lvcreate
& -L 800G -n drbd vg1 /dev/sde1&
& 8. I was setting DRBD device on logical volume &drbd&. I made some
& changes to &filter& parameter in &/etc/lvm/lvm.conf&.
& 9. I noticed that there &PV unknown device& and I accidentally removed
& it with command (I am not 100% sure of this) &vgreduce --removemissing
& vg1&. If I remember correctly used switch &-f& too. :-(
& 10. Then I found out that system was acting strangely. If I remember
& correct it prompted something &Couldn't find device with uuid...&. Then
& I realized how stupid I had been!
& 11. Then I followed instructions on
11.1. I booted with installation disk to installation environment
11.2. I run: &vgdisplay --partial --verbose&
11.3.Then I run &pvcreate --restorefile /etc/lvm/backup/vg1 --uuid
& UUID /dev/sde1 -ff&
11.4. Then again: &vgdisplay --partial --verbose&
11.5. At last: &vgcfgrestore --file
/etc/lvm/backup/vg1 vg1&
& 12. I removed volume group &drbd&.
& Notice: device /dev/sde was attached all the time.
& 13. After this running commands:
& /dev/vg1/dir-1: read failed after 0 of 4096 at :
& Input/output error
& /dev/vg1/dir-1: read failed after 0 of 4096 at :
& Input/output error
& /dev/vg1/dir-1: read failed after 0 of 4096 at 0: Input/output error
& /dev/vg1/dir-1: read failed after 0 of 4096 at 4096: Input/output error
& /dev/vg1/dir-1: read failed after 0 of 4096 at 0: Input/output error
& /dev/vg1/dir-2: read failed after 0 of 4096 at :
& Input/output error
& /dev/vg1/dir-2: read failed after 0 of 4096 at :
& Input/output error
& /dev/vg1/dir-2: read failed after 0 of 4096 at 0: Input/output error
& /dev/vg1/dir-2: read failed after 0 of 4096 at 4096: Input/output error
& /dev/vg1/dir-2: read failed after 0 of 4096 at 0: Input/output error
& /dev/vg1/root: read failed after 0 of 4096 at : Input/output
& /dev/vg1/root: read failed after 0 of 4096 at : Input/output
& /dev/vg1/root: read failed after 0 of 4096 at 0: Input/output error
& /dev/vg1/root: read failed after 0 of 4096 at 4096: Input/output error
& /dev/vg1/root: read failed after 0 of 4096 at 0: Input/output error
& /dev/md1
& /dev/sde1
& Is there any change to recover LVM from this point? I don't care if I
& loose the newest data but I really want to salvage at least the older data.
Actually this is much like what happened to me:
Correction to item 9. where I claimed that I used command &vgreduce&. I
am pretty sure I used &pvremove& instead as told in the article &How to
undo pvremove&.
References:
From: Tero
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