Thanks Sébastien,
Yes, it works fine with btrfs.
It also works with kvm + librbd + virtio + XFS (without mount / remount file system):
# Guest :
$ df -h | grep vdb
/dev/vdb 500G 22G 479G 5% /share2
# On host :
$ rbd resize datashare/share2 --size 614400
$ virsh blockresize --domain vmhost --path vdb --size 600G
# Guest :
$ xfs_growfs /share2
data blocks changed from 131072000 to 157286400
$ df -h | grep vdb
/dev/vdb 600G 22G 579G 4% /share2
--
Laurent
2013/4/9 Sebastien Han <sebastien.han@xxxxxxxxxxxx>
This is pretty old thread, I launched a similar discussion a while ago here http://www.spinics.net/lists/ceph-devel/msg08096.html. I got it working but _only_ with btrfs… See the procedure below:# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 7.0 (wheezy)
Release: 7.0
Codename: wheezy# uname -a
Linux os-ci-test1 3.2.0-4-amd64 #1 SMP Debian 3.2.39-2 x86_64 GNU/Linux# rbd -p leseb create --size 4096 seb# rbd -p leseb map seb# mkfs.btrfs /dev/rbd0
WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
fs created label (null) on /dev/rbd0
nodesize 4096 leafsize 4096 sectorsize 4096 size 4.00GB
Btrfs Btrfs v0.19# mount /dev/rbd0 /mnt/# rbd -p leseb resize seb --size 8192
Resizing image: 100% complete…done.# fdisk -l /dev/rbd0
Disk /dev/rbd0: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders, total 8388608 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 4194304 bytes / 4194304 bytes
Disk identifier: 0x00000000
Disk /dev/rbd0 doesn't contain a valid partition table# blockdev --rereadpt /dev/rbd0
# fdisk -l /dev/rbd0
Disk /dev/rbd0: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders, total 16777216 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 4194304 bytes / 4194304 bytes
Disk identifier: 0x00000000
Disk /dev/rbd0 doesn't contain a valid partition table# df -h | grep mnt/dev/rbd0 4.0G 56K 3.6G 1% /mnt# btrfs filesystem resize max /mnt
Resize '/mnt' of 'max'
# df -h | grep mnt
/dev/rbd0 8.0G 120K 7.6G 1% /mntUnfortunately I just tried with ifs and it doesn't work...Cheers––––
Sébastien Han
Cloud Engineer
"Always give 100%. Unless you're giving blood."
PHONE : +33 (0)1 49 70 99 72 – MOBILE : +33 (0)6 52 84 44 70
EMAIL : sebastien.han@xxxxxxxxxxxx – SKYPE : han.sbastien
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On Apr 5, 2013, at 3:05 PM, Laurent Barbe <laurent@xxxxxxxxxxx> wrote: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
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