Yes, but the managemnet want to see some numbers/reasons for the
choosen hardware other than it is big & fast
2008/3/28, WEAVER, Simon (external) <simon.weaver AT astrium.eads DOT net>:
>
> Mike
> From my view, 8GB is the bare min.... the more the better. The faster
> the CPU or CPU's the better... the faster and bigger the disks are ,....
> even better :-)
>
> Simon
>
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Michael
> Graff Andersen
> Sent: Wednesday, March 26, 2008 5:49 PM
> To: Ed Wilts
> Cc: veritas-bu
> Subject: Re: [Veritas-bu] Sizing experiences ?
>
> How do you arrive at 16 GB memory ?
>
> Regards
> Michael
>
> 2008/3/26, Ed Wilts <ewilts AT ewilts DOT org>:
> > You didn't specify the OS either. You're going to need some serious
> > staging units since you have 400MB of theoretical bandwidth in and
> > about twice that out to tape. You either have too many tape drives or
>
> > they're going to be underutilized.
> >
> > No matter what OS, that memory seems awfully tight. I wouldn't touch
> > that config with under 16GB of memory. Instead of 8 LTO-3 drives on a
>
> > single master/media server, you should probably split that up into
> > separate master and media servers.
> >
> > Do the I/O calculations very, very carefully. You're probably not
> > going to be able to pull that config off with any Windows server I've
> > seen - you'll starve those tape drives since you likely won't even
> > have enough HBA bandwidth to drive them. You're far better off
> > driving 4 LTO-3 drives at full speed than 8 drives at a slow,
> shoe-shining speed.
> >
> > What kills most environments is not CPU but I/O. Don't just assume
> > that your disk I/O is adequate - we see destaging performance plummet
> > when we write to the same disk at the same time.
> >
> > .../Ed
> >
> >
> > On Wed, Mar 26, 2008 at 11:06 AM, Michael Graff Andersen
> > <mian71 AT gmail DOT com>
> > wrote:
> > >
> > > Oops, didn't write that the master/media server will have 4x 1 Gbit
> > > NICs & 8x LT03 tape drives. Using the document I arrived at 8 CPUs &
> > > 4.6 GB RAM
> > >
> > > Trying to get a server that can handle the NICs & tape drive at full
>
> > > tilt & peoples experiences with using this document or other methods
>
> > > of sizing
> > >
> > > Regards
> > > Michael
> > >
> > > 2008/3/26, Ed Wilts <ewilts AT ewilts DOT org>:
> > >
> > >
> > >
> > > > On Wed, Mar 26, 2008 at 10:26 AM, Michael Graff Andersen
> > <mian71 AT gmail DOT com>
> > > > wrote:
> > > >
> > > > > We are about to replace our backup server and I have used the
> > > > > Backup Planning and Performance Tuning Guide for 6.0 to size our
>
> > > > > new server
> > > > >
> > > > > Our server people think the sizing is wrong, more specifically
> > > > > that it gives to many CPUs
> > > > >
> > > > > What are you experience regarding sizing ?
> > > >
> > > > Rule #1. There's no such thing as "too many CPUs or too much
> memory".
> > > > Rule #2. See Rule #1
> > > > Rule #3. Is your storage growing? If it is, see rule #1.
> > > >
> > > > In general, the master server needs lots of memory and cpu and the
> media
> > > > servers need less memory but lots of I/O bandwidth. All of them
> need
> > > > plenty of disk space for logs - 20-50GB at a minimum and in a busy
>
> > > > environment while troubleshooting issues, 100GB of logs is not
> > > > unheard
> > of.
> > > > Without significantly more details on what exactly you're trying
> > > > to accomplish and what config you came up with, we're not going to
>
> > > > be able
> > to
> > > > get more specific than that.
> > > >
> > > > .../Ed
> > > >
> > > > --
> > > > Ed Wilts, Mounds View, MN, USA
> > > > mailto:ewilts AT ewilts DOT org
> > >
> > >
> > >
> > > _______________________________________________
> > > 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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