[Users] Re: Problems encountered increasing CT diskspace with layout=ploop

[jjs - mainphrame]

Just an added data point to follow up my earlier post -

Although the online re-size of the ploop-based disk CT fails, creating a CT
with the desired disk size using "layout=ploop
--diskspace=20000000:24000000" works.

Thanks for your work on this, hope to see it in PVC one day.

Joe

On Fri, Mar 23, 2012 at 11:27 AM, jjs - mainphrame <jjs at mainphrame.com>wrote:

> Running kernel 2.6.32-042stab053.3, vzctl-3.1 and ploop-1.1 on centos-6.2
> 32 bit, I created 2 similar vswap-256 CTs running debian-5.0-x86.
>
> The only appreciable difference between the CTs is the  layout: CT 777 is
> simfs, CT 779 is ploop
>
> [root at mrmber conf]# for i in `vzlist -1`; do ech0 $i; vzctl exec $i df
> -T; done
> 777
> Filesystem    Type   1K-blocks      Used Available Use% Mounted on
> /dev/simfs   simfs     2097152    376820   1720332  18% /
> tmpfs        tmpfs      131072         0    131072   0% /lib/init/rw
> tmpfs        tmpfs      131072         0    131072   0% /dev/shm
> 779
> Filesystem    Type   1K-blocks      Used Available Use% Mounted on
> /dev/ploop0p1 ext4     2268760    445756   1707756  21% /
> tmpfs        tmpfs      131072         0    131072   0% /lib/init/rw
> tmpfs        tmpfs      131072         0    131072   0% /dev/shm
>
> We can successfully resize the simfs-based CT 777:
>
> [root at mrmber conf]#  vzctl set 777 --diskspace=20000000:24000000 --save
> CT configuration saved to /etc/vz/conf/777.conf
>
> But attempting to resize ploop-based CT 779 results in an error:
>
> [root at mrmber conf]# vzctl set 779 --diskspace=20000000:24000000 --save
> Can't ioctl mount_point: No such file or directory
> Failed to resize image: Can't ioctl mount_point: No such file or directory
> [3]
> CT configuration saved to /etc/vz/conf/779.conf
>
> [root at mrmber conf]# for i in `vzlist -1`; do echo $i; vzctl exec $i df -T
> ; done
> 777
> Filesystem    Type   1K-blocks      Used Available Use% Mounted on
> /dev/simfs   simfs    20000000    376820  18532204   2% /
> tmpfs        tmpfs      131072         0    131072   0% /lib/init/rw
> tmpfs        tmpfs      131072         0    131072   0% /dev/shm
> 779
> Filesystem    Type   1K-blocks      Used Available Use% Mounted on
> /dev/ploop0p1 ext4     2268760    445756   1707756  21% /
> tmpfs        tmpfs      131072         0    131072   0% /lib/init/rw
> tmpfs        tmpfs      131072         0    131072   0% /dev/shm
> [root at mrmber conf]#
>
> Any advice on where to look for more info? dmesg had nothing to say about
> it, and vzctl.log says only what the command reported above.
>
> Regards,
>
> Joe
>
>
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