Date: Thu, 11 Jun 1998 13:51:25 +0200 From: "Andras Tudos - Computronic, C3" <andras.tudos@computronic.hu> To: "IBS / Andre Oppermann" <andre@pipeline.ch> Cc: isp@FreeBSD.ORG, marci@c3.hu Subject: Re: file system performance Message-ID: <3.0.5.32.19980611135125.00a36240@computronic.hu> In-Reply-To: <357FBCC5.BBB836FE@pipeline.ch> References: <3.0.5.32.19980611000210.00a868b0@computronic.hu> <3.0.5.32.19980611124654.00aad210@computronic.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.) >> >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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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