Date: Sun, 16 Oct 2005 09:16:34 -0400 From: "Will Saxon" <WillS@housing.ufl.edu> To: <stable@freebsd.org> Subject: Disk 100% busy Message-ID: <0E972CEE334BFE4291CD07E056C76ED807738005@bragi.housing.ufl.edu>
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I am trying to diagnose a problem whereby a virus scanner (clam antivirus) is taking too long to scan attachments on a mail server. We have an attachment limitation of 20MB and an attachment of 7-20MB can take over 3 minutes to scan. This often causes the sending mail server to timeout and resend the mail. =20 In this case, my mail gateway is is a dual 3.06GHz Xeon with 1GB of ram and 2 36GB 15krpm drives in a raid-1 on a smart array 6i (cciss) controller. I am running FreeBSD 5.4-RELEASE-p1.=20 Systat -vmstat reports the disk mirror is 100% busy at all times on this machine, with an average of around 300 tps at 15KB/t. This seems wrong to me, as these numbers are maintained even when the system doesn't otherwise appear busy. We don't seem to be swamped by log writes. How can I tell what's generating these disk writes? At the moment the 100% disk utilization is the only thing I can see that would cause the scanning delay. The machine overall is sluggish with file operations.=20 -Will -- Will Saxon Systems Programmer, Network Services University of Florida Department of Housing Phone: (352) 392-2171 x10148 Email: wills@housing.ufl.edu
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