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	(8.6.12/D) Thu, 11 Jun 1998 16:36:31 +0400
From: bag@sinbin.demos.su (Alex G. Bulushev)
Message-Id: <199806111236.QAA24876@sinbin.demos.su>
Subject: Re: file system performance
In-Reply-To: <3.0.5.32.19980611135125.00a36240@computronic.hu> from "Andras Tudos - Computronic, C3" at "Jun 11, 98 01:51:25 pm"
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To: andras.tudos@computronic.hu (Andras Tudos - Computronic, C3)
Date: Thu, 11 Jun 1998 16:36:31 +0400 (MSD)
Cc: andre@pipeline.ch, isp@FreeBSD.ORG, marci@c3.hu
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> At 13:17 98.06.11 +0200, you wrote:
> >
> >What type of RAID do you have (I assume RAID 5)?
> >Is the CMD5440 an external RAID controller or internal?
> >
> RAID5. External. (Backend PC has an Adaptec UW SCSI controller connected to
> the CMD RAID controller with 16Mb of cache, it has 3 UW channels each with
> 2x 9Gb IBM UW 7200 drives.)

RAID5 is not good choice for high performance, we use RAID1+0 there
on similar system for users catalog's and mbox'es

for small block's operation raid cache very usefull (64-128MB)

  Alex.

> 
> >> >The other point is POP3 access... I think there's no way around NFS but
> >> >that should'nt be so problematic since POP3 does only read and delete
> >> >which is not so bad over NFS.
> >> >
> >> Yes, POP3 load is not that bad. The big problem is the periodic huge
> >> incoming load caused by user subscriptions to various mailing lists (we
> >> have ~60000 mailboxes at the moment and it is linearly growing by ~7500
> >> each month). We have to reach a better peak local delivery performance than
> >> the current one to keep the "sitting in the queue" time at an acceptable
> >> level.
> >
> >What sits in the queue? Incoming mail?
> >
> Yes. The local deliveries cannot keep up with the smtp-accept rate at peak
> periods. There are lists with hundreds of subscribers from our system and
> they generate a huge amount of mail traffic. The problems occur on the
> current single server system, but we want the new system to have at least
> ten times more performance than the current overloaded server to have
> spares for the continuosly increasing traffic (and we would like to develop
> other projects instead of having to upgrade our system each month :).
> 
> Andras
> 
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