ADSM-L

Re: How do you keep a 3590E busy enough?

1999-11-03 14:21:17
Subject: Re: How do you keep a 3590E busy enough?
From: "Richard L. Rhodes" <rhodesr AT FIRSTENERGYCORP DOT COM>
Date: Wed, 3 Nov 1999 14:21:17 -5
On 3 Nov 99, at 16:31, John Schneider wrote:
>     For some of our smaller client backups, we could send the data to a
> disk pool, then migrate it to tape, but that doesn't really cure the
> problem, since then a disk pool volume reading at 9MB/sec is trying to
> drive a 36MB/sec drive, which can't keep it busy.  And we nightly back
> up a 400GB database, so we have to go directly to tape for that backup,
> we can't throw 400GB of intermediate disk pool at it!  Would even a
> small amount of disk pool help?

The only way I know of to increase the speed of a disk subsystem for
sequential i/o is to strip the data across multiple drives.  I have
one filesystem comprised of 3 18gb narrow scsi2 drives.  During
sequential I/O It will hit 20mb/s.  I have another filesystem
stripped across a bunch of EMC hypervolumes that does sequential i/o
at 50mb/s.  The disk subsystem needs to be designed for the
throughput you need.  I've very interested in this since were
evaluating ADSM and I'm trying to come up with a disk subsystem
design for the staging pools.

rick
----------------------------------------------------------------------
Richard L. Rhodes     e: rhodesr AT firstenergycorp DOT com
Richard L. Rhodes     e: rhodesr AT firstenergycorp DOT com
Ohio Edison Co.       p: 330-384-4904
                      f: 330-384-2514
<Prev in Thread] Current Thread [Next in Thread>