LVM input/output error

filesystemslvm

When I run the lvdisplay, it showed the following error…

/usr/sbin/lvdisplay
    /dev/sdb: read failed after 0 of 2048 at 0: Input/output error
    /dev/sdb1: read failed after 0 of 2048 at 0: Input/output error
    /dev/sdb2: read failed after 0 of 2048 at 0: Input/output error
    /dev/sdb3: read failed after 0 of 2048 at 0: Input/output error
--- Logical volume ---
...

I can still see my volumes, when the error is showing everytime, any idea?

Best Answer

If the drive supports smartctl, you can also get a trivial read on it with smartctl -H /dev/sdb. smartctl -a /dev/sdb will give you more information; the SMART attributes data structure is well worth a look. You can also use smartctl -t to run tests on the drive, some of which can be run with the system in normal operation (though they will impact performance); do a man smartctl to find out more.

Related Solutions

Lvm – Linux Software RAID1: How to boot after (physically) removing /dev/sda? (LVM, mdadm, Grub2)

You need to install GRUB to the MBR of both drives, and you need to do it in a way that GRUB considers each disk to be the first disk in the system.

GRUB uses its own enumeration for disks, which is abstracted from what the Linux kernel presents. You can change which device it thinks is the first disk (hd0), by using a "device" line in the grub shell, like so:

device (hd0) /dev/sdb

This tells grub that, for all subsequent commands, treat /dev/sdb as the disk hd0. From here you can complete the installation manually:

device (hd0) /dev/sdb
root (hd0,0)
setup (hd0)

This sets up GRUB on the first partition of the disk it considers to be hd0, which you've just set as /dev/sdb.

I do the same for both /dev/sda and /dev/sdb, just to be sure.

Edited to add: I always found the Gentoo Wiki handy, until I did this often enough to commit it to memory.

Linux – Recover partition table for lvm

You should break out the backup of your partition table and dd it back into place. Or run a partition recovery tool (The first hit on Google for "recover partitions Linux" looks interesting). But I'd stick with the partition table backup.

Best Answer

Related Solutions

Lvm – Linux Software RAID1: How to boot after (physically) removing /dev/sda? (LVM, mdadm, Grub2)

Linux – Recover partition table for lvm

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