Jorge,
this a limitation of the technology. TSM tries to workaround it by using
"aggregates" - bunch of files is treated as single object. However for
tiny flies (I liked your typo, it is close to bugs :-) even an aggregate
of 256 files is too small and LTO does not stream.
You cannot work around this limitation without changing the technology. A
technology suitable for performing such a task is used in IBM 3590 B/E/H
and STK 9840/9940 drives. LTO is good for bulk transfer/storage and to be
more competitive onprice has some limitations.
Zlatko Krastev
IT Consultant
Jorge Andrés Salinas Girodengo <[EMAIL PROTECTED]>
Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
13.06.2003 18:16
Please respond to "ADSM: Dist Stor Manager"
To: [EMAIL PROTECTED]
cc:
Subject: Re: TSM LTO 3580 Performance
Hi All
I have sort of the same problem. But my drives are connected through a
SAN.
So small flies in LANFree Backups are an issue. Is there a way to avoid
this
interrupted stream issue? It sounds like a terrible waste to have several
LTO-1s with fibre attachments and HBAs and what nots to have to always
rely
on disk pools.
Thanks
Jorge Salinas
----- Original Message -----
From: "Lloyd Dieter" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, June 13, 2003 9:57 AM
Subject: Re: TSM LTO 3580 Performance
> Also...an Adaptec 2940 is an older SCSI-2 card...10MB/sec, isn't it?
>
> Maybe that's an issue....
>
> -Lloyd
>
>
> On Thu, 12 Jun 2003 08:11:51 -0500
> Colby Morgan <[EMAIL PROTECTED]> wrote:
>
> > We in the process of moving to an IBM 3580 external LTO drive for
manual
> > offsite vaulting of primary storage pools. I have read several older
> > reports on http://msgs.adsm.org about poor performance with TSM, LTO and
> > small files. We are experiencing the same behavior and I was just
> > curious if anybody has ran into this lately. We see about
10-15GB/hour
> > with small files and 42-57GB/hour on larger files.
> >
> > We are running TSM 5.1.6.5 on Win2k SP3. The drive is an external IBM
> > 3580 and is the only device hooked to an Adaptec 2940 SCSI controller.
> > We are also running v5.0.5.4 of the IBM 3580 drivers.
> >
> > I maxed out the following server options (which helped):
> > MoveBatchSize 1000
> > TxnGroupMax 256
> >
> > I also set the drive parameters via ntutil as described in this
Redbook
> > (which also helped):
> > http://www.redbooks.ibm.com/redpieces/pdfs/sg246268.pdf
> >
> > Anybody else ran into these problems?
> >
> >
> > Thanks,
> >
> > Colby
> >
>
>
> --
> -----------------------------------------------------------------
> Lloyd Dieter - Senior Technology Consultant
> Registered Linux User 285528
> Synergy, Inc. http://www.synergyinc.cc [EMAIL PROTECTED]
> Main:585-389-1260 fax:585-389-1267
> SMS:[EMAIL PROTECTED]
> -----------------------------------------------------------------
