FilerView for ONTAP 7.0 concentrated on the commonly used features of Flexible Volumes and Aggregrates. Aggregate snapshots was not considered a commonly used feature.
- Rick -
> -----Original Message-----
> From: Derek Lai [mailto:Derek.Lai@onyxco.com]
> Sent: Tuesday, April 26, 2005 6:12 PM
> To: 'Skottie Miller'; Steve Losen
> Cc: toasters(a)mathworks.com
> Subject: RE: Aggregate snapshots?
>
>
> Is this documented well anywhere? I've just started playing
> with DataOntap
> 7.0 on the new FAS250 we bought. I've looked through NOW and
> can't seem to
> find good documentation regarding Aggregate Snapshots.
>
> It looks like there are a number of commands now that has -A
> options added,
> i.e. snap list -A to list the aggregate snapshot. Would be
> nice to know what
> Aggregate Snapshot are designed to do. There does not seem to
> be anything in
> filerview that lets you work with Aggregate snapshots?
>
>
>
> Derek
>
> -----Original Message-----
> From: Skottie Miller [mailto:skottie@anim.dreamworks.com]
> Sent: Monday, April 25, 2005 11:53 AM
> To: Steve Losen
> Cc: toasters(a)mathworks.com
> Subject: Re: Aggregate snapshots?
>
>
> My understanding of aggregate snapshots is that they provide
> an additional
> layer of snapshot protection, and are useful in some environments.
>
> restoring an aggregate snapshot restores *all* the flexVols
> within that
> aggregate. aggregate snapshots are required if you use RAID
> SyncMirror
> and/or MetroCluster configurations.
> or of you want to snaprestore a whole aggregate (seems dangerous).
>
> Note that aggregate snapshots aren't allowed to grow abouve
> the reserve, and
> will "autodelete" themselves to maintain space.
>
> on my test filers and in my test use of the simulator, I've
> been running
> with aggregate snapshots disabled and the reserve set to 0. NetApp
> "discourages" this, but unless they send me 5% more disks,
> free, I want that
> space back for production.
>
> -skottie
>
> Steve Losen wrote:
> > We just got a R200 and FAS960c and I immediately upgraded them from
> > 6.5 to 7.0.0.1. I moved the root volume to a flex vol and
> destroyed
> > the old root, so now I have one big aggregate that contains
> the root
> > volume.
> >
> > I discovered the "df -A" command and was surprised to see that my
> > aggregate has snap reserve space, a snap sched running, and five
> > snapshots. This is independent of the snap reserve and sched of my
> > root volume.
> >
> > What is the rationale behind aggregate snapshots? We don't have
> > snapmirror licensed. Can you snapmirror them? Can you snaprestore
> > them? I presume this mirrors (or restores) the entire aggregate.
> > I doubt that you can access aggregate snapshots from a NFS or CIFs
> > client, or can you? Can you somehow tease out volumes from an
> > aggregate snapshot and NFS export them? Within an
> aggregate snapshot,
> > do you have just the active volumes, or the volumes and all
> of their
> > volume level snapshots as they existed at the time the aggregate
> > snapshot was taken? Mind boggling.
> >
> > I am probably going to set the snap reserve on my
> aggregates to zero
> > and turn off the snap sched and manage my snapshots at the volume
> > level. Any reason to not do that? Using both aggregate and volume
> > snapshots looks about the same as using a belt and
> suspenders to keep
> > your pants up.
> >
> > Steve Losen scl(a)virginia.edu phone: 434-924-0640
> >
> > University of Virginia ITC Unix Support
> >
> >
>
> --
>
> Scott Miller
> skottie(a)DreamWorksAnimation.com
>