Re: [Engine-devel] Proposal for support ISO domain on other types of file based storage.
----- Original Message -----
Hi guys,
Currently, ISO domain is only supported on NFS storage. It could
improve the ease of use if it allows other types
of file based storage to store ISO images. After an investigation, I
found there's not any restriction on this idea.
So the whole work is removing the limitation on engine side. That
means engine should allow ISO domain could
have different storage type from the data center it's attached, like
what we do with nfs ISO domain in SAN DC.
I start this idea with localfs. I know local storage can't be seen in
cluster level. But it also provides a choice if no
NFS available. VMs can be created on the host which has the ISO repo,
and then be migrated to any other host in the cluster.
I have done the initial patches: allow creation ISO domain on localfs
[1] and support import ISO domain on localfs [2]
I don't have much experience in java/j2ee/web development and engine
architecture. The patches just work for me.
I am not sure if it will bring some potential problems. So any
feedback on the patch or the idea will be appreciated very much.
Haven't looked at the patches yet, but wrt the idea, I agree on the need (being able
to attach ISOs from anywhere and not just nfs) but I think the way to do this should be by
getting rid of the ISO domain type altogether.
Basically what we need is:
1. a way to connect to file based storage (let's leave block aside for now) - this
already exists via the connectStorageServer verb
2. a way to list and present a file system tree in gui (give an arbitrary path to vdsm and
list content) and possibly filter results by type (vfd, iso) - does not exist today.
Possibly some security aspects here that need hashing out.
3. a way to specify a path to a file when attaching an iso/vfd to a VM - this is the way
it works today
This would devoid the need for isoUploader and allow users to simply manage an nfs export
with files.
Next step would be to make connectStorageServer support httpfs [1] and then we'd be
able to mount ISOs directly over http (hopefully this would be sufficient to support ISOs
stored on S3, swift, glance, etc).
[1] http://httpfs.sourceforge.net/
Mark.
[1] http://gerrit.ovirt.org/#/c/12687/
[2] http://gerrit.ovirt.org/#/c/12916/
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