I agree. I assume if you are coming from an OS/390 environment, you are
using IBM or STK 3480, 3490, or 3590 or 9840 tape. Nothing will give you
the tape reliability you are used to, except those same types of tape. That
means a 3494 with IBM tape, or an STK library with 3490 or 9840 tape.
Next best thing for performance & reliability would be 3575 Magstar, if your
ADSM requirements are small enough to fit one of those libraries.
Next best thing reported in terms of reliability & performance is Sony AIT
tape (haven't tried it myself - see www.adsm.org for a discussion by Kelly
Lipp a couple of months ago.)
Don't do DLT unless, as Joe says, you intend to go direct to tape for a few
large clients. DLT cannot handle the same duty cycle and repositioning that
the enterprise class drives can.
For the host, it's hard to drive the CPU on and RS6000; If you are backing
up many small systems (i.e., your ADSM data base is large), generally you
will bottleneck on I/O on the db and log before you run out of cycles.
You need enough disk space for one night's data, as Joe says; also make sure
you buy something that can be expanded in case you need to get additional
controller cards to separate the DB and log I/O from your stgpool I/O.
(Tuning I/O throughput for the RS6000 is pretty much the same as disk
planning for your OS/390 - you can only do one I/O to one disk at a time).
My opionions and nobody else's,
Wanda Prather
> -----Original Message-----
> From: Joe Faracchio [SMTP:brother AT SOCRATES.BERKELEY DOT EDU]
> Sent: Monday, March 13, 2000 12:09 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: ADSM on AIX
>
> As others have said, it depends. I am using a 3466/NSM which is an AIX
> F50. It comes with 2 processors upgrade to 4.
>
> You need enough disk space to 'stage' a days worth of backups
> if you're backing up small systems. Or go directly to tape for very large
> DLT is good for that but from my experience I would recommend staying away
> from DLT if you have a lot of small systems to backup and plan to be
> agressive about restore performance by using collocation and a lot of
> reclaims. ... etc.
>
> You're welcome tocall me to chat if you like more info.
> ... joe.f.
>
>
> Joseph A Faracchio, Systems Programmer, UC Berkeley
> 1-510-642-7638
>
> On Thu, 9 Mar 2000, Katherine Faella wrote:
>
> > Hello,
> >
> > It looks like we will be moving our *SM server from OS/390 to AIX. We
> are
> > currently trying to determine what hardware will best suits our needs.
> If
> > anyone can help me, especially in the area of tape drives and tape
> media, I
> > would surely appreciate it.
> > Thanks,
> > Kathy Faella
> >
> >
> > Katherine Faella kmf AT uri DOT edu
> > Senior Technical Programmer
> > University of Rhode Island
> > Kingston, RI 02881 (401) 874-4469
> >
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