[linux-lvm] Problem with partially activate logical volume

[Roger James]

Try https://www.linuxsysadmins.com/recover-a-deleted-physical-volume/?amp

On 26 July 2022 09:16:32 Ken Bass <daytooner at gmail.com> wrote:
> (fwiw: I am new to this list, so please bear with me.)
>
> Background: I have a very large (20TB) logical volume consisting of 3 
> drives. One of those drives unexpectedloy died (isn't that always the case 
> :-)). The drive that failed happened to be the last PV. So I am assuming 
> that there is still 2/3 of the data still intact and, to some extent, 
> recoverable. Although, apparently the ext4 fs is not recognised.
>
> I activated the LV partially (via -P). But running any utility on that (eg: 
> dumpe2fs, e2fsck, ...) I get many of these  in dmesg:
>
> "Buffer I/O error on dev dm-0, logical block xxxxxxx, async page read."  
> The thing is, the xxxxxxx block is on the missing drive/pv.
>
> I have also tried some recovery software, but eventually get these same 
> messages, and the data recovered is not really useful.
>
> Please help! How can I get passed that dmesg error, and move on. 14TB 
> recovered is better than 0.
>
> TIA
> ken
>
>
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