I have tried a simple ftp from the NT (Exchange server) to UNIX and got
27G/hr out of it.  So it isn't the network.  Of course, the ftp is from disk to
disk.  I can only get at most 3G/hr out of the ADSM connect agent (disk to
tape).  We are running Seagate Backup Exec in production to backup the db.
The Seagate backup takes about half the time even though the data have to march
through the network twice (NT server to Seagate Backup Exec server to ADSM
server).
We would like to switch to ADSM for simplicity, but with throughput
much worse than Seagate there is no way we could justify the switch.
We only have a 6 hour window to backup the db.  As the db is expected to
grow exponentially next year we won't be able to back it up in 6 hours.

Eliza

------------------------------------------------------------------------------
 Eliza Lau
 Eliza Lau
 Virginia Tech Computing Center                email : eliza.lau AT vt DOT edu
 Virginia Polytechnic Institute & State University
 1700 Pratt Drive
 Blacksburg VA 24060                           phone : (540) 231-9399
------------------------------------------------------------------------------
>
>
> Lau,
>
> an ftp via our LAN gives transfer rate of 4-8 GB/hr.
>
> The bottleneck seems to reside in the adsm clients because:
>
> - an mono-session backup with Adsm connect agent for Exchange gives 4 GB/hr
> - a multi-session backup with Backint agent for SAP (6 sessions in //) gives
> 34 GB/hr.
>
> As these rates are ok for us right now, we will not investigate much further
> for the moment.
>
> Regards,
>
> Rene Lambelet
> Nestec SA - 55, Av. Nestle - CH-1800 Vevey
> Tel: ++41'21'924'35'43 / Fax: ++41'21'924'45'89
> E-Mail: rene.lambelet AT nestle DOT com
>
>
>
> > -----Original Message-----
> > From: Simon Watson [SMTP:simon.s.watson AT SHELL.COM DOT BN]
> > Sent: Monday, August 30, 1999 10:51 AM
> > To:   ADSM-L AT VM.MARIST DOT EDU
> > Subject:      Re: ADSMconnect agent for Exchange throughput
> >
> > Lau,
> >
> > Why not try a simple ftp to see what network transfer rates you can
> > actually get.  You may have a router or something in between which is
> > causing the bottleneck.  In my experience the network transfer rate
> > will generally be only limited by the network infrastructure.  We are
> > getting a ntr of about 15 GB/hr over standard 100BT from UNIX to UNIX,
> > although it is generally a bit smaller for NT.
> >
> > Cheers,
> > Simon
> > ----------
> > | From: Rene.Lambelet /  mime, , , Rene.Lambelet AT NESTLE DOT COM
> > | To: ADSM-L /  mime, , , ADSM-L AT VM.MARIST DOT EDU
> > | Subject: Re: ADSMconnect agent for Exchange throughput
> > | Date: Monday, 30 August, 1999 4:06PM
> > |
> > | Hello Lau,
> > |
> > | we have an OS/390 server, 3.1.2.20, ATM connection via CISCO CIP card,
> > | Exchange running on a Compaq 7000 (2x400 MHz):
> > |
> > | we have a rate of 4 GB / hour for backups with the Adsm agent for
> > Exchange.
> > |
> > | Regards,
> > |
> > | Rene Lambelet
> > | Nestec SA - 55, Av. Nestle - CH-1800 Vevey
> > | Tel: ++41'21'924'35'43 / Fax: ++41'21'924'45'89
> > | E-Mail: rene.lambelet AT nestle DOT com
> > |
> > |
> > | > -----Original Message-----
> > | > From: Eliza Lau [SMTP:lau AT VTCAT.CC.VT DOT EDU]
> > | > Sent: Tuesday, August 10, 1999 9:45 PM
> > | > To:   ADSM-L AT VM.MARIST DOT EDU
> > | > Subject:      ADSMconnect agent for Exchange throughput
> > | >
> > | > ADSMers,
> > | >
> > | > What throughput is everyone getting out of the ADSMconnect agent for
> > | > Exchange?
> > | >
> > | > The setup:
> > | > AIX 4.3.1 server running ADSM 3.1.2.13.
> > | > 3494 with four 3590 drives (device data rate - 32G/hr)
> > | > ADSMconnect agent 1.1b
> > | > 100mb ethernet connection for the ADSM server and the Exchange server
> > | >
> > | > It takes the ADSMconnect agent 2.85 hours to backup the 8G Exchange
> > | > database
> > | > with a network transfer rate of 3.04GB/hr.  I am using the performance
> > | > settings
> > | > recommended in the "Using ADSM to Back Up and Recover Microsoft
> > Exchange
> > | > Server"
> > | > redbook.  It states that the throughput maximum that can be obtained
> > for a
> > | > 100mb Ethernet network is 34GB/hr.  I am getting only one tenth of
> > that.
> > | > Where is my bottleneck?  I have asked our network people to look for
> > | > any network problems.  The ADSM server and the Exchange server are
> > | > in different subnets, but they are in the same room and only 30 feet
> > from
> > | > each other.  Where else should I look?  Thanks.
> > | >
> > | > dsm.opt:
> > | > TCPwindowsize   64
> > | > tcpbuffsize     32
> > | > txnbytelimit    25600
> > | > compression     off
> > | >
> > | >
> > --------------------------------------------------------------------------
> > | > ----
> > | >  Eliza Lau
> > | >  Virginia Tech Computing Center                email :
> > eliza.lau AT vt DOT edu
> > | >  Virginia Polytechnic Institute & State University
> > | >  1700 Pratt Drive
> > | >  Blacksburg VA 24060                           phone : (540) 231-9399
> > | >
> > --------------------------------------------------------------------------
> > | > ----
> > |
>