On Thu, Dec 15, 2005 at 01:45:20PM -0500, Paul Keating wrote:
> Aptare Storage Console has a Media Forecasting Dashboard...that does
> this...sorta.
The "sorta" is VERY dependent on your backup patterns. StorageConsole
bases it on days of the week so if you have nice clean weekend fulls and
daily incrementals, it might give you an accurate picture. If you tend
to a bunch of ad hoc 1TB backups scattered on different weekdays, you're
not going to find it very useful. Unfortunately for us, we're in the
latter category and frankly, even knowing how much I personally know
about our backup patterns, I can't think of any possible formula
StorageConsole can use to do its prediction unless it goes through all
the schedules, does a guess on those, and then does a historical search
to see how much that schedule and mount point combination took in the
past. Those would be a bit ugly and could be very, very wrong.
.../Ed
> > -----Original Message-----
> > From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> > [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of
> > Piszcz, Justin
> > Sent: December 15, 2005 1:38 PM
> > To: Mark.Donaldson AT cexp DOT com; veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: RE: [Veritas-bu] Question regarding available tapes.
> >
> >
> > Basically, I wonder if NetBackup 6.0 will say, you will run
> > out of tapes
> > in 74 hours, you have 6 tapes left.
> >
> > Know any software out there that might do this? :)
> >
> > -----Original Message-----
> > From: Mark.Donaldson AT cexp DOT com [mailto:Mark.Donaldson AT cexp DOT
> > com]
> > Sent: Thursday, December 15, 2005 1:35 PM
> > To: Piszcz, Justin; veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: RE: [Veritas-bu] Question regarding available tapes.
> >
> > Yeah - text stuff is pretty squishy - it'll get down there - I've seen
> > much
> > more than the average 2:1. My database backups only get
> > about 1.3:1 or
> > so,
> > not very compressible.
> >
> > It varies a lot by data type.
> >
> > ...and, yes, it's the amount *on* the tape - but that's disk
> > bytes sent
> > to
> > that tape, not tape bytes occupied. If you see 100G reported as being
> > on
> > the tape, it may only be taking up 50GB of actual tape media. Like I
> > said,
> > the amount remaining, given compression, is very hard to calculate.
> >
> > -M
> >
> > -----Original Message-----
> > From: Piszcz, Justin [mailto:jpiszcz AT servervault DOT com]
> > Sent: Thursday, December 15, 2005 11:18 AM
> > To: Mark.Donaldson AT cexp DOT com; veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: RE: [Veritas-bu] Question regarding available tapes.
> >
> >
> > Interesting though, I use LTO2 which are 200/400GB, but with
> > compression, it ranges from 400-500gb on some tapes.
> >
> > -----Original Message-----
> > From: Mark.Donaldson AT cexp DOT com [mailto:Mark.Donaldson AT cexp DOT
> > com]
> > Sent: Thursday, December 15, 2005 1:00 PM
> > To: Piszcz, Justin; veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: RE: [Veritas-bu] Question regarding available tapes.
> >
> > bpmedialist will give you a count of how how many bytes are
> > on the tape
> > (kbytes column):
> >
> > > bpmedialist -U
> > Server Host = XXXXXXXXXXXXX
> >
> > id rl images allocated last updated
> > density kbytes
> > restores
> > vimages expiration last read
> > <------- STATUS
> > ------->
> > --------------------------------------------------------------
> > ----------
> > ----
> > ----
> > 004526 3 310 08/21/2005 03:40 12/11/2005 06:36 hcart2
> > 61698920
> > 0
> > MPX 01/11/2006 06:36 N/A
> >
> > 004696 3 874 11/20/2005 02:37 12/12/2005 02:33 hcart2
> > 318870566
> > 0
> > MPX 01/12/2006 02:33 N/A
> >
> > 004801 4 32 11/15/2005 19:54 11/15/2005 19:55 hcart2
> > 81122987
> > 0
> > MPX 01/16/2006 19:55 N/A
> >
> > 005165 6 6 06/15/2005 19:33 06/15/2005 19:33 hcart2
> > 19992648
> > 2
> > MPX 06/15/2006 19:33 07/11/2005 15:52
> >
> > 005265 3 1874 06/10/2005 16:54 12/11/2005 06:01 hcart2
> > 557969356
> > 0
> > MPX 01/11/2006 07:29 N/A
> >
> > After that, you're starting to guess. Because the amount of bytes per
> > tape
> > can vary by the compressibilty of the data, the total amount of bytes
> > actually stored on the tape can vary. The closest you can do is
> > calculate
> > some sort of average compression ratio by looking at full tapes, then
> > estimate based on that for your non-full tapes. Personally,
> > I'd do this
> > by
> > volume pool as my compressibility is going to vary a lot by
> > data source.
> >
> >
> > HTH - M
> >
> >
> > -----Original Message-----
> > From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> > [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Piszcz,
> > Justin
> > Sent: Thursday, December 15, 2005 10:40 AM
> > To: veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: [Veritas-bu] Question regarding available tapes.
> >
> >
> > Hello,
> >
> > I can easily see how many scratch tapes, those that have not been
> > written to
> > yet. However, I probably have several tapes that are currently not
> > fully
> > filled up, scratch tapes that had a few fragments written to it. Is
> > there
> > anyway to determine how full the tapes are?
> >
> > Justin.
> >
> > _______________________________________________
> > Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> >
>
> _______________________________________________
> Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
--
Ed Wilts, Mounds View, MN, USA
mailto:ewilts AT ewilts DOT org
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