On Mon, Feb 20, 2006 at 11:36:45PM +0100, Ludovic Strappazon wrote:
> Wolfgang Denk wrote:
> >And assuming you are backing up some big RAID array it might be
> >difficult to provide big enough spool files.
That's certainly the case in my situation. I don't have 4 TB sitting
idle that I can dedicate to spool space, and even if I did, it
wouldn't help performance any because of the sequential nature of
spooled backup jobs.
> >So the only real advantage of data spooling as I see it is that it
> >helps to reduce tape (drive) wear by avoiding frequent start-stop
> >sequences - which is only a problem if your file system cannot
> >provide the data faster than the tape can write. In my experience
> >this is only the case for differential and incremental backups - and
> >then the data size might be small enough to fit in a spool file.
Yes, I think that that's right, but it wasn't obvious from the
documentation. That's what lead me to give this a try.
> >Ideally I'd like to be able to turn spooling off for level "full"
> >backups while leaving it turned on for "differential" and
> >"incremental" ones.
>
> You can override your job's default in the schedule, something like :
>
> Schedule {
> Name = "MySchedule"
> Run = pool="MyPool" Full fri at 20:30
> Run = SpoolData=yes pool="MyPool" Storage="LTOdrive" Differential mon-thu at
> 20:30
> Run = SpoolData=yes pool="MyPool" Storage="LTOdrive" Incremental fri at 11:35
> }
>
> Ludovic Strappazon.
This looks like the way to go. If I leave spooling enabled at all, it
will be with a setup like this where its use can be limited to the
remote clients that stand to benefit.
-- John Kodis.
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