Yes, if you use 3 tapes for Monday night's backups, you will need 3 tapes to
create the offsite copies that day.
But that is not sufficient for estimating the capacity you need in a tape
library.
Over time the tapes will become less than 100% full.
.
> -----Original Message-----
> From: Selva, Perpetua [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, October 04, 2000 11:06 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Capacity and Storage Space on our Tape Library
>
> Hi Wanda,
>
> Thanks ..
>
> I'm little confused as to the process not what needs to be done.
>
> When making a copy of existing storage pools, no matter how many tapes
> were
> used for the nightly backups. Wouldn't i be backing up the storage pools
> involved by doubling the no.of tapes..
>
> Let me know
> Thanks in advance
>
>
> -----Original Message-----
> From: Prather, Wanda [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, October 03, 2000 4:44 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Capacity and Storage Space on our Tape Library
>
>
> Not really.
> The storage pool tapes are usually not 100% full.
>
> As different files have different numbers of backup versions, some of
> those
> tapes have less and less good data; their %reclaimable value goes up over
> time.
>
> So you can't count on all the tapes in the library being 100% full.
> I usually count on the tapes being at best 65 - 70% full.
>
> Here's a select command you can use to get a feel for the %utilization of
> your tapes:
>
> select stgpool_name, status,cast( mean(pct_utilized)as
> decimal(5,2)) as avg_pctu from volumes -
> where devclass_name <> 'DISK' group by stgpool_name, status
>
>
> ************************************************************************
> Wanda Prather
> The Johns Hopkins Applied Physics Lab
> 443-778-8769
> [EMAIL PROTECTED]
>
> "Intelligence has much less practical application than you'd think" -
> Scott Adams/Dilbert
> ************************************************************************
>
>
>
>
>
> > -----Original Message-----
> > From: Selva, Perpetua [SMTP:[EMAIL PROTECTED]]
> > Sent: Tuesday, October 03, 2000 11:03 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Capacity and Storage Space on our Tape Library
> >
> > Hi All,
> >
> > Just wanted to confirm if this is what is actually happening within my
> > Library as i'm planning on our capacity.
> >
> > Daily Data backups are around 15G
> > Backup of Storage Pools doubles the amount to 30G
> > Plus one tape for database backup ..
> >
> > By the end of the day... i have used up 7-10 tapes....
> >
> > Please verify if this is the proper procedures to follow..
> >
> >
> > Thanks in advance
