[Users] openvz ploop images on moosefs mount

[Corin Langosch]

Hi Kirill,

thank you for your very fast response. :)

Am 31.03.2012 20:54, schrieb Kirill Kolyshkin:
>
> Ploop only supports ext4 and nfs
>
Is there any special reason for this? I'd really like to know the 
technical aspects because I then might be able to make moosefs (or 
another fuse based fs developed by myself) working with ploop. If I can 
read about it in any documents, please redirect me to them :)

Another question: is it (easily) possible make an openvz container use a 
normal block devices for storage (which is formatted with ex. ext4)? 
Before seeing ploop I thought this won't be possible, but now with ploop 
it seems vzctl is only mounting /dev/ploopX somewhere and then using 
this mount as the container's root. I'd especially be interested in 
using ex. an iscsi backed block device with openvz containers.

Corin

Am 31.03.2012 20:54, schrieb Kirill Kolyshkin:
>
> Ploop only supports ext4 and nfs
>
> 31.03.2012 22:50 ???????????? "Corin Langosch" <info at corinlangosch.com 
> <mailto:info at corinlangosch.com>> ???????:
>
>     Hi,
>
>     has anybody tried using the new ploop storage for openvz images
>     together with moosefs ( http://www.moosefs.org/)?
>
>     ploop mount -d /dev/ploop0 /mfs-mount/root.hdd
>     Adding delta dev=/dev/ploop0 img=/mfs-mount/root.hdd (rw)
>     PLOOP_IOC_ADD_DELTA /mfs-mount/root.hdd: Invalid argument
>
>     In syslog I find:
>     kernel: File on FS without backing device
>
>     I thought it might be because ploop needs direct-io (right?), but
>     mounting with direct-io enabled seems not to be supported by moosefs:
>
>     mfsmount -o direct_io /mfs-mount
>     mfsmaster accepted connection with parameters:
>     read-write,restricted_ip ; root mapped to root:root
>     fuse: unknown option `direct_io'
>
>     Has anybody got it working somehow? :)
>
>     Btw: I'll also post this question to the moosefs mailinglist as
>     I'm pretty sure the devs there might have interesting answers too.
>
>     Corin
>
>
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