Re: ADSMconnect agent for Exchange throughput

Try some performance tuning before abandoning the Agent.

I doubled my ADSM solution capacity by tunning my server. I increased TPC
buffers and parameters (tcp_sendspace, tcp_recvspace, somaxconn, sb_max)
and also read some kernel tips from the ADSM Performance guide over vmtune.

On the client side, I increased TCPBUFFSIZE and TCPWINDOWSIZE. The Connect
Agent Redbook gives a little help, but nothing like learning from trying
(if well documented, of course).

Helped a lot in my implementation, I am doing my benchmarks this week.

And, about your backup window, the Agent does the backup online, an since
mail is by definition an assynchronous activity, ...

Is your network dedicated to the backup activity ? I've experienced IBM's
fast ethernet interface having problems with auto-negotiation, so force the
right media (100_half / 100_full_duplex), etc.

good luck,
Rodrigo


>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
>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
>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
>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
>> - a multi-session backup with Backint agent for SAP (6 sessions in //
>> 34 GB/hr.
>>
>> As these rates are ok for us right now, we will not investigate much
>> 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
>> > actually get. You may have a router or something in between whic
>> > causing the bottleneck. In my experience the network transfer ra
>> > will generally be only limited by the network infrastructure. We
>> > getting a ntr of about 15 GB/hr over standard 100BT from UNIX to
>> > 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 C
>> > | Exchange running on a Compaq 7000 (2x400 MHz):
>> > |
>> > | we have a rate of 4 GB / hour for backups with the Adsm agent
>> > 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 ADSMconnec
>> > | > 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 Exc
>> > | >
>> > | > It takes the ADSMconnect agent 2.85 hours to backup the 8
>> > | > database
>> > | > with a network transfer rate of 3.04GB/hr. I am using the
>> > | > settings
>> > | > recommended in the "Using ADSM to Back Up and Recover Mic
>> > Exchange
>> > | > Server"
>> > | > redbook. It states that the throughput maximum that can b
>> > for a
>> > | > 100mb Ethernet network is 34GB/hr. I am getting only one
>> > that.
>> > | > Where is my bottleneck? I have asked our network people t
>> > | > any network problems. The ADSM server and the Exchange se
>> > | > in different subnets, but they are in the same room and o
>> > 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
>> > | >
>> > ----------------------------------------------------------------
>> > | > ----
>> > |
>>