Re: [Veritas-bu] Sizing experiences ?

Then you have to test what you are proposing and how that it can or
cannot do the job.  

I agree with Ed on your tape drive numbers.  You're not even close to
having enough juice to drive the tape drives you've proposed, and you'll
never get there with a single server.  At 1.5:1 compression (what I see
as an average), you have 960 MB/s of (80 * 1.5 * 8) tape drive
throughput back there!  You will NEVER get to that number, not even if
you have 10 GbE.

As to how many CPUs and how much RAM you need to maximize trunked quad
GbE?  I'll defer to Ed & company.  Only testing will prove them right or
wrong for your management.

---
W. Curtis Preston
Backup Blog @ www.backupcentral.com
VP Data Protection, GlassHouse Technologies 

> -----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: Friday, March 28, 2008 1:36 AM
> To: WEAVER, Simon (external)
> Cc: Ed Wilts; veritas-bu
> Subject: Re: [Veritas-bu] Sizing experiences ?
> 
> 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
> > _______________________________________________
> > Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
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