Hi
How many FC adapter do you have in your Exchange client? Is the disk for
the client SAN connected?
If the disk is SAN connected, try using two HBA:s instead of one. Mixing
sequential writing with random reading is not a good idea.
I have had this kind of problem before, with a 3584 with 2 SCSI drives
connected through a SAN Data Gateway. When we inserted a second HBA, the
problem was gone. Now we have reached speeds up to 15MB/s on the SAN Data
Gateway attached drives. We also have two drives connected through FC, and
there we have reached, as a maximum, 27MB/s.
Best Regards
Daniel Sparrman
-----------------------------------
Daniel Sparrman
Daniel Sparrman
Exist i Stockholm AB
Bergkällavägen 31D
192 79 SOLLENTUNA
Växel: 08 - 754 98 00
Mobil: 070 - 399 27 51
Karsten Huettmann
<Karsten.Huettman To: ADSM-L AT VM.MARIST
DOT EDU
n AT CARUS DOT DE> cc:
Sent by: "ADSM: Subject: Pooooor TDP for
Exchange Performance via SAN
Dist Stor
Manager"
<[email protected]
.EDU>
2002-03-18 07:35
Please respond to
"ADSM: Dist Stor
Manager"
Hi everybody!
I'm sitting here looking at my customers environment and wonder
how TDP for Exchange
is sooooo slow via SAN.
We have a complete Win2000 environment with all the newest
patches installed
(Server 4.2.1.12, StorageAgent 4.2.1.12, API 4.2.1.30, TDP Exch.
2.2)
We share two drives of a 3584 library via SAN data gateway
(newest firmware).
The backup via LAN (!) is nearly as fast as it could be (up to 12
MB/s without compression).
But the backup via SAN ist very slow.
It starts slow (at 1200 KB/s) and slows down to 800 KB/s.
Does anyone have recommendations tuning the dsm.opt-file or
tdpexc.cfg-file...
my dsm.opt-file:
tcpwindowsize 63
tcpbuffsize 32
txnb 25600
my tdpexc.cfg-file:
buffers 4
buffersize 2048
... or any other ideas?
(Are there any rules-of-thumb how to tune this options?)
Thanx in advance,
Karsten Huettmann, c.a.r.u.s. IT AG, Germany
-----
Mit freundlichen Grüssen / with regards
Mit freundlichen Grüssen / with regards
Karsten Hüttmann
----------------------------------------------------------
Karsten Hüttmann
Karsten Hüttmann
c.a.r.u.s. Information Technology AG
Advanced System Center
Bornbarch 9, 22848 Norderstedt, Germany
E-Mail: karsten.huettmann AT carus DOT de
Firma: +49.40.51435.3231
Mobil: +49.171.7634388
Fax: +49.40.51435.1111
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