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Re: openvz ploop images on moosefs mount [message #45733 is a reply to message #45732] Sat, 31 March 2012 19:13 Go to previous messageGo to previous message
Corin Langosch is currently offline  Corin Langosch
Messages: 18
Registered: March 2012
Junior Member
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@corinlangosch.com
> <mailto:info@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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