Hi,

Thank you for replying. How do I go about turn on the
LTO drive compression, as these drives are attach to
L25 tape library at the back. Any command I can use? I
also going to uncheck the netbackup compression see
how it goes tonite. Regarding the buffer setting, I'm
using the default which I think 32K. Do you think this
buffer setting cause the extra time? I attached the
tape library to our SUN box and ONLY backup data from
the SUN. No network backup or so ever. I'm very
suprise about the time that I have here.

What negative impact can I get if I use bigger buffer
size? And if I use both drives at the same how's the
writing work? Does it write at the same time or one
after another?

I'll let you know the outcome tomorrow morning.

Thank you.

regards,
feroz

 --- "Donaldson, Mark"
<Mark.Donaldson AT experianems DOT com> wrote: > Don't use
the Netbackup client compression.  It's
> software based and causes
> a high client load, slowing the backups.  Your LTO
> drive is capable of
> hardware compression, use that.
> 
> LTO is good for about 15 MB/sec native, perhaps
> 25-30MB streaming rates if
> you can get the data to it fast enough & the data is
> decently compressible.
> So 74G at 15 MB/sec is only 84 minutes so you're
> really underperforming. 
> 
> Check your buffer sizes.  For my LTO drives, I'm
> using 256K buffers & it
> makes a big performance difference.  Check this
> whitepaper for a description
> buffer sizes & counts.  Make sure to set the buffers
> for both client & media
> server. 
> http://seer.support.veritas.com/docs/183702.htm  If
> your system is
> Windows, check out this instead:
> http://seer.support.veritas.com/docs/244652.htm
> 
> Also consider the path from client to media server. 
> If it's standard
> ethernet, it's only capable of about 10MB/sec, and
> your drive will be
> underutilized.  Consider Gigabit ethernet if
> possible.
> 
> That should be enough to start with - post back any
> results you get.
> -M
> 
> -----Original Message-----
> From: Feroz F. Basir [mailto:dbase77 AT yahoo DOT com]
> Sent: Thursday, March 13, 2003 9:54 AM
> To: Donaldson, Mark;
> veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] 2 tape drives issue
> 
> 
> Hi,
> 
> LTO drive.
> 
> regards,
> feroz
> 
>  --- "Donaldson, Mark"
> <Mark.Donaldson AT experianems DOT com> wrote: > What kind
> of
> drive (DLT, LTO, etc.) in the L25?
> > -M
> > 
> > -----Original Message-----
> > From: Feroz F. Basir [mailto:dbase77 AT yahoo DOT com]
> > Sent: Thursday, March 13, 2003 4:15 AM
> > To: veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: RE: [Veritas-bu] 2 tape drives issue
> > 
> > 
> > Hi,
> > 
> > Thank you to all who replied to my problem. I got
> it
> > to work to use both tape drives at the same time
> > using
> > 2 different policies. 
> > 
> > Backup took about 5 hrs to finish for 74 GB data
> on
> > 1
> > tape. I wonder myself if I can improve the time
> > here.
> > I only backup oracle data files. Plus select to
> > compress. Is this normal behaviour. I'm using NB
> 4.5
> > business server on SUN storedge L25 tape library
> > with
> > 2 drives.
> > 
> > Thank you again.
> > 
> > regards,
> > feroz
> > 
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