Date: Thu, 11 Jun 1998 00:02:10 +0200 From: "Andras Tudos - Computronic, C3" <andras.tudos@computronic.hu> To: isp@FreeBSD.ORG Cc: marci@c3.hu Subject: file system performance Message-ID: <3.0.5.32.19980611000210.00a868b0@computronic.hu>
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We are setting up a largish qmail based mail server. We are using 3 frontend machines (PII-233, 128Mb, FreeBSD 2.2.6) to accept incoming smtp mail and to service pop3 user requests. The mailboxes are on the backend machine (PII-400, 128Mb, FreeBSD 2.2.6, external HW RAID array on UW SCSI) and are shared via NFS. All PCs are on a 100Mbps switched LAN. The problem: file system performance (either measured over NFS or on the local RAID array). We can get 1.6Mbps when continuosly copying 1-2K files and 44Mbps when copying (dd) /dev/zero. The later is perfect, but the former is too low. We tried almost all options (sync and async mode), but couldn't get it higher. With this performance the server can deliver about 700,000 messages per day (measured with simulated mail load), which is less than required (on long term). Any ideas how to improve performance? Andras Tudos C3, Budapest To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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