I've been thinking for a while now on how to acomplish this exact idea
of a control structure for managing iscsi disks for clean backups.
One could use simple remote commands via ssh if everything were UNIX
based. I don't know how windows handles remote calls, so i'm not the one
to work on this part. :)
Are there any existing products for ms/unix that would be ideal to use
in building something like this?
On Wed, 2005-07-13 at 10:13 -0400, Ming Zhang wrote:
> On Wed, 2005-07-13 at 17:07 +0300, Pasi Kärkkäinen wrote:
> > 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..
> yes,
>
> >
> > I think that kind of lvm + iscsitarget control daemon would be good for
> > Linux server snapshots too.. not only for VSS stuff.
> yes, ini side assure that system is clean and thus daemon do flush and
> snapshot. i knew samba has a sample script, but not generic
>
> >
> > 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..
> yes.
>
> >
> > Is there anything like this in EVMS ? Or in some other project?
> not heard of.
>
> >
> > - 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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