On Mon, Aug 6, 2018 at 3:24 AM Dai Xiang <xiang.dai@xxxxxxxxxxx> wrote:
>
> On Thu, Aug 02, 2018 at 01:04:46PM +0200, Ilya Dryomov wrote:
> > On Thu, Aug 2, 2018 at 12:49 PM <xiang.dai@xxxxxxxxxxx> wrote:
> > >
> > > I create a rbd named dx-app with 500G, and map as rbd0.
> > >
> > > But i find the size is different with different cmd:
> > >
> > > [root@dx-app docker]# rbd info dx-app
> > > rbd image 'dx-app':
> > > size 32000 GB in 8192000 objects <====
> > > order 22 (4096 kB objects)
> > > block_name_prefix: rbd_data.1206643c9869
> > > format: 2
> > > features: layering
> > > flags:
> > > create_timestamp: Thu Aug 2 18:18:20 2018
> > >
> > > [root@dx-app docker]# lsblk
> > > NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
> > > vda 253:0 0 20G 0 disk
> > > └─vda1 253:1 0 20G 0 part /
> > > vdb 253:16 0 200G 0 disk
> > > └─vg--test--data-lv--data 252:0 0 199.9G 0 lvm /test/data
> > > vdc 253:32 0 200G 0 disk
> > > vdd 253:48 0 200G 0 disk /pkgs
> > > vde 253:64 0 200G 0 disk
> > > rbd0 251:0 0 31.3T 0 disk /test/docker <====
> > >
> > > [root@dx-app docker]# df -Th
> > > Filesystem Type Size Used Avail Use% Mounted on
> > > /dev/vda1 xfs 20G 14G 6.5G 68% /
> > > devtmpfs devtmpfs 7.8G 0 7.8G 0% /dev
> > > tmpfs tmpfs 7.8G 12K 7.8G 1% /dev/shm
> > > tmpfs tmpfs 7.8G 3.7M 7.8G 1% /run
> > > tmpfs tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
> > > /dev/vde xfs 200G 33M 200G 1% /test/software
> > > /dev/vdd xfs 200G 117G 84G 59% /pkgs
> > > /dev/mapper/vg--test--data-lv--data xfs 200G 334M 200G 1% /test/data
> > > tmpfs tmpfs 1.6G 0 1.6G 0% /run/user/0
> > > /dev/rbd0 xfs 500G 34M 500G 1% /test/docker <====
> > >
> > > Which is true?
> >
> > Did you run "rbd create", "rbd map", "mkfs.xfs" and "mount" by
> > yourself? If not, how was that mount created?
>
> Yes, i do `rbd create`, `rbd map`, `mkfs.xfs` and `mount`.
>
> I think the different size is that i do `rbd resize 102400T` and
> cancel it.
>
> But the result is not what we want, right?
"rbd resize" resizes only the rbd image itself. The filesystem needs
to be resized separately. So if you created the filesystem and _then_
grew the image with "rbd resize", both are true: the old size for XFS
and the new size for the image.
Thanks,
Ilya
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