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cmcginty
Asked: 2014-01-18 16:30:13 +0800 CST

LVM volume mapped block device size is 0

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I'm having a problem with my LVM volume. I lost a disk out of my RAID array, and started in in degraded mode. Now when I try to access 2 of the LVM volumes, they report a block size of 0. Does anyone know what is going on?

$ lvdisplay
--- Logical volume ---
LV Name             /dev/vg0/home
VG Name             vg0
...
LV Size             20.00 GiB

$ blockdev --getsize64 /dev/mapper/vg0-root
0

$ mount /dev/mapper/vg0-root /mnt
mount: /dev/mapper/vg0-root: can't read superblock

$mke2fs -n /dev/mapper/vg0-root
mke2fs 1.41-14 (22-Dec-2010)
mke2fs: Device size reported to be zero. Invalid partition specified, or
        partition table wasn't reread after running fdisk, due to
        a modified partition being busy and in use. You may need to reboot
        to re-ready your partition table.
lvm

1 Answers

  1. I retested with a newer linux kernel and the issue went away. Maybe this was an old bug that has been fixed.

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