Date: Thu, 11 Jun 1998 16:36:31 +0400 (MSD) From: bag@sinbin.demos.su (Alex G. Bulushev) To: andras.tudos@computronic.hu (Andras Tudos - Computronic, C3) Cc: andre@pipeline.ch, isp@FreeBSD.ORG, marci@c3.hu Subject: Re: file system performance Message-ID: <199806111236.QAA24876@sinbin.demos.su> 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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> 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 > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-isp" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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