Veritas-bu

Re: [Veritas-bu] Sizing experiences ?

2008-03-28 04:39:24
Subject: Re: [Veritas-bu] Sizing experiences ?
From: "WEAVER, Simon \(external\)" <simon.weaver AT astrium.eads DOT net>
To: "Michael Graff Andersen" <mian71 AT gmail DOT com>, "Ed Wilts" <ewilts AT ewilts DOT org>
Date: Fri, 28 Mar 2008 08:24:54 -0000
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

This email (including any attachments) may contain confidential and/or
privileged information or information otherwise protected from disclosure.
If you are not the intended recipient, please notify the sender
immediately, do not copy this message or any attachments and do not use it
for any purpose or disclose its content to any person, but delete this
message and any attachments from your system. Astrium disclaims any and all
liability if this email transmission was virus corrupted, altered or
falsified.
---------------------------------------------------------------------
Astrium Limited, Registered in England and Wales No. 2449259
REGISTERED OFFICE:-
Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2AS, England

_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

<Prev in Thread] Current Thread [Next in Thread>