On Wed, Jul 13, 2005 at 08:22:51AM -0400, Ming Zhang wrote:
> Thanks for the link. We need a windows developer here. :P
>
VSS plugin support also requires some kind of "control daemon" to Linux to be
able
to easily create new lvm snaphots and make them visible in iscsitarget from
the VSS plugin..
I think that kind of lvm + iscsitarget control daemon would be good for
Linux server snapshots too.. not only for VSS stuff.
Say you have a storage server running iscsitarget + lvm, and an
application server running some iscsi-initiator and using disk space from
the storage server.
Now to successfully create snapshot for backup purposes (of the application
server)
you need to shutdown/"freeze" the applications for a while, and then tell the
storage-server to create the snapshot.. Creating the snapshot in the storage
server takes only couple of seconds, and after that you can again start the
applications and do the backup from the new iscsi LUN (containing the
snapshot) visible in the application server or in the separate
backup-server.
This process needs to be controller from the application server.. or from
separete backup server.. in any case, it cannot be controller from the
storage-server (iscsitarget).
Sounds like we need a daemon for controlling the iscsitarget + lvm,
and a library/cli-commands/scripts to control the daemon from
initiator-boxes.. these are needed for VSS support, and for Linux support
too..
Is there anything like this in EVMS ? Or in some other project?
- Pasi
> Ming
>
> On Wed, 2005-07-13 at 14:29 +0300, Pasi Kärkkäinen wrote:
> > Hi!
> >
> > I was searching the web for Windows 2003 VSS hardware provider drivers for
> > Linux iscsi
> > targets, but didn't find any.. but I found this:
> >
> > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vss/base/developing_vss_hardware_providers.asp
> >
> > There is some documentation about developing VSS hw provider drivers for
> > win2k3.
> >
> > Maybe somebody finds it usefull.. and maybe creates VSS driver for
> > linux iscsitarget + lvm combo :)
> >
> > -- Pasi Kärkkäinen
> >
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