Ubuntu
lvm2 package

Can't write to new logical volume created with --virtualsize

Bug #1067293 reported by Richard C
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
lvm2 (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

$ lsb_release -rd
Description: Ubuntu 12.04.1 LTS
Release: 12.04
$ apt-cache policy lvm2
lvm2:
  Installed: (none)
  Candidate: 2.02.66-4ubuntu7.1
  Version table:
     2.02.66-4ubuntu7.1 0
        500 http://ftp.iinet.net.au/pub/ubuntu/ precise-updates/main amd64 Packages
     2.02.66-4ubuntu7 0
        500 http://ftp.iinet.net.au/pub/ubuntu/ precise/main amd64 Packages

The behaviour I see with --virtualsize (note) errors following mkfs. The same errors can be seen using cp, dd, or other programs that write to the new logical volume device.

someUser@vmhost02:~$ sudo lvcreate --virtualsize 10000m -L 4Mi -n ceph01-root vg-vmhost02
  Logical volume "ceph01-root" created
someUser@vmhost02:~$ sudo lvdisplay /dev/vg-vmhost02/ceph01-root
  --- Logical volume ---
  LV Name /dev/vg-vmhost02/ceph01-root
  VG Name vg-vmhost02
  LV UUID Or7wyp-ajck-POWF-d3ZR-fOY2-LLLP-jPe3zI
  LV Write Access read/write
  LV snapshot status active destination for /dev/vg-vmhost02/ceph01-root_vorigin
  LV Status available
  # open 0
  LV Size 9.77 GiB
  Current LE 2500
  COW-table size 4.00 MiB
  COW-table LE 1
  Allocated to snapshot 0.20%
  Snapshot chunk size 4.00 KiB
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:13

someUser@vmhost02:~$ sudo mkfs -t ext4 /dev/vg-vmhost02/ceph01-root
mke2fs 1.42 (29-Nov-2011)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
640848 inodes, 2560000 blocks
128000 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2621440000
79 block groups
32768 blocks per group, 32768 fragments per group
8112 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

someUser@vmhost02:~$ sudo lvdisplay /dev/vg-vmhost02/ceph01-root
  /dev/dm-13: read failed after 0 of 4096 at 0: Input/output error
  --- Logical volume ---
  LV Name /dev/vg-vmhost02/ceph01-root
  VG Name vg-vmhost02
  LV UUID Or7wyp-ajck-POWF-d3ZR-fOY2-LLLP-jPe3zI
  LV Write Access read/write
  LV snapshot status INACTIVE destination for /dev/vg-vmhost02/ceph01-root_vorigin
  LV Status available
  # open 0
  LV Size 9.77 GiB
  Current LE 2500
  COW-table size 4.00 MiB
  COW-table LE 1
  Snapshot chunk size 4.00 KiB
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:13

someUser@vmhost02:~$ sudo lvcreate --virtualsize 10000m -L 4Mi -n ceph01-root vg-vmhost02
  Logical volume "ceph01-root" created
someUser@vmhost02:~$ sudo lvdisplay /dev/vg-vmhost02/ceph01-root
  --- Logical volume ---
  LV Name /dev/vg-vmhost02/ceph01-root
  VG Name vg-vmhost02
  LV UUID Or7wyp-ajck-POWF-d3ZR-fOY2-LLLP-jPe3zI
  LV Write Access read/write
  LV snapshot status active destination for /dev/vg-vmhost02/ceph01-root_vorigin
  LV Status available
  # open 0
  LV Size 9.77 GiB
  Current LE 2500
  COW-table size 4.00 MiB
  COW-table LE 1
  Allocated to snapshot 0.20%
  Snapshot chunk size 4.00 KiB
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:13

someUser@vmhost02:~$ sudo mkfs -t ext4 /dev/vg-vmhost02/ceph01-root
mke2fs 1.42 (29-Nov-2011)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
640848 inodes, 2560000 blocks
128000 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2621440000
79 block groups
32768 blocks per group, 32768 fragments per group
8112 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

someUser@vmhost02:~$ sudo lvdisplay /dev/vg-vmhost02/ceph01-root
  /dev/dm-13: read failed after 0 of 4096 at 0: Input/output error
  --- Logical volume ---
  LV Name /dev/vg-vmhost02/ceph01-root
  VG Name vg-vmhost02
  LV UUID Or7wyp-ajck-POWF-d3ZR-fOY2-LLLP-jPe3zI
  LV Write Access read/write
  LV snapshot status INACTIVE destination for /dev/vg-vmhost02/ceph01-root_vorigin
  LV Status available
  # open 0
  LV Size 9.77 GiB
  Current LE 2500
  COW-table size 4.00 MiB
  COW-table LE 1
  Snapshot chunk size 4.00 KiB
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:13

someUser@vmhost02:~$ sudo lvremove /dev/vg-vmhost02/ceph01-root
  /dev/dm-13: read failed after 0 of 4096 at 0: Input/output error
Do you really want to remove active logical volume ceph01-root? [y/n]: y
  Logical volume "ceph01-root" successfully removed

The expected behaviour is shown below, with a logical volume, where the whole capacity is allocated at creation.

someUser@vmhost02:~$ sudo lvcreate -L 10000m -n ceph01-root vg-vmhost02
  Logical volume "ceph01-root" created
someUser@vmhost02:~$ sudo mkfs -t ext4 /dev/vg-vmhost02/ceph01-root
mke2fs 1.42 (29-Nov-2011)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
640848 inodes, 2560000 blocks
128000 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2621440000
79 block groups
32768 blocks per group, 32768 fragments per group
8112 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

someUser@vmhost02:~$ sudo lvdisplay /dev/vg-vmhost02/ceph01-root
  --- Logical volume ---
  LV Name /dev/vg-vmhost02/ceph01-root
  VG Name vg-vmhost02
  LV UUID Uafjh9-PDHT-rTzq-bfmL-petB-RaNW-IqZkYm
  LV Write Access read/write
  LV Status available
  # open 0
  LV Size 9.77 GiB
  Current LE 2500
  Segments 1
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 252:13

Tags: lts lvm precise
Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in lvm2 (Ubuntu):
status: New → Confirmed
Richard C (richard-c)
tags: added: precise
tags: added: lvm
Richard C (richard-c)
tags: added: lts
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