Re: Online resizing RBD kernel module

[Laurent Barbe <laurent@xxxxxxxxxxx>]

Thanks for your answer,

no more chance with blockdev --rereadpt or partprobe -s. :(

2013/4/5 Wido den Hollander <wido@xxxxxxxx>

On 04/05/2013 12:34 PM, Laurent Barbe wrote:

Hello,

I'm trying online resizing with RBD + XFS. But when i try to make a
xfs_growfs, it doesn't seen the new size. I don't use partition table,
os is debian squeeze / kernel 3.8.4 / ceph 0.56.4.
It seems that the mounted file system prevents update the block device
size ?

If the file system is not mounted, or if I unmount + mount, xfs_growfs
works as expected.

When I block device is in use it can't change. When you unmount the blockdevice is no longer in use and the new size can be detected.

This is a not a RBD limitation, but it's something that goes for all block devices in Linux.

I've seen some patches floating around that could do this online, but I'm not sure if they are in the kernel.

You could try this:

$ blockdev --rereadpt /dev/rbd1

Or

$ partprobe -s /dev/rbd1


--
Wido den Hollander
42on B.V.

Phone: +31 (0)20 700 9902
Skype: contact42on

#### ORIGINAL SIZE ####
   # parted /dev/rbd1 print
   Model: Unknown (unknown)

   Disk /dev/rbd1: *105MB*

   Sector size (logical/physical): 512B/512B
   Partition Table: loop

   Number  Start  End    Size   File system  Flags
   1      0,00B  105MB  105MB  xfs

#### RBD RESIZE ####
   # rbd resize rbdxfs --size=200
   Resizing image: 100% complete...done.

#### SIZE NOT CHANGE IF FS ON RBD1 IS MOUNTED ####
   # parted /dev/rbd1 print
   Model: Unknown (unknown)

   Disk /dev/rbd1: *105MB*

   Sector size (logical/physical): 512B/512B
   Partition Table: loop

   Number  Start  End    Size   File system  Flags
   1      0,00B  105MB  105MB  xfs

#### UMOUNT FS --> SIZE OK ####
   # umount /mnt/rbdxfs
   # parted /dev/rbd1 print
   Model: Unknown (unknown)

   Disk /dev/rbd1: *210MB*

   Sector size (logical/physical): 512B/512B
   Partition Table: loop

   Number  Start  End    Size   File system  Flags
   1      0,00B  210MB  210MB  xfs


Any Ideas ?
Thanks

--
Laurent Barbe

_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com