Veritas-bu

[Veritas-bu] backing up LARGE oracle databases (looking for s ugge stions)

2005-01-31 12:28:54
Subject: [Veritas-bu] backing up LARGE oracle databases (looking for s ugge stions)
From: Charles Ballowe <cballowe AT gmail DOT com> (Charles Ballowe)
Date: Mon, 31 Jan 2005 11:28:54 -0600
Your bottleneck could also be bus bandwidth. If your drives and
network card are both on the same 33 Mhz 32 bit pci bus, the max
bandwidth is around 132000000 bytes/sec - overhead. That would be 60
read from disk + 60 write to network. Since I don't know enough about
your server config, I can't say whether that's the case, but it could
be. You could try piping /dev/zero into a network stream just to prove
the point.

-Charlie


On Mon, 31 Jan 2005 09:46:30 -0600, Dobbertien, Matthew
<MDobbertien AT tribune DOT com> wrote:
> We have run multiple tests on the system.  Writing the backup to
> /dev/null results in over 100 MB/s throughput, but running the same jobs
> over the network maxes out at 60 MB/s regardless of number of streams or
> tape drives or disk on the back end (we generally write to virtual tape,
> which has a throughput of over 150 MB/s).  We do see a maximum
> throughput of 40 MB/s per stream--I believe this is just the overhead
> from bpbkar.  The disks we are reading from are capable of pushing data
> much faster than that (backend disks are on a clarion cx600).  Even
> running three backup streams from the same disk results in over 100 MB/s
> throughput.
> 
> Matthew Dobbertien
> Sr. Systems Analyst
> Chicago Tribune
> mdobbertien AT tribune DOT com
> 312-222-2203 (Work)
> 312-656-3019 (Cell)
> 
> -----Original Message-----
> From: blaine_robison AT netzero DOT com [mailto:blaine_robison AT netzero DOT 
> com]
> Sent: Monday, January 31, 2005 9:09 AM
> To: Dwayne.Brzozowski AT mail.va DOT gov
> Cc: Dobbertien, Matthew; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] backing up LARGE oracle databases (looking for
> s ugge stions)
> 
> Hey,
> thanks Dwayne,
> 
> Matt how do you know the GigE connection is the choke point?
> 
> Blaine Robison
> Solaris Certified System Administrator
> Solaris Certified Network Administrator
> Sun Certified Backup and Recovery Engineer
> Veritas Certified Professional Data Recovery
> 
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