Date: Sun, 15 Sep 1996 21:38:40 +0200 From: petzi@zit.th-darmstadt.de (Michael Beckmann) To: isp@freebsd.org Subject: INN history file and disk I/O Message-ID: <v02140b01ae62039c6700@[195.52.251.6]>
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Hello ISPs, I have run into a problem with one of my newsservers recently. It is a P120, 64 MB, Adaptec 2940, 3 SCSI drives running FreeBSD 980801-SNAP. INN version 1.4unoff4. It receives and sends several full feeds, but is hardly used by readers. In general, the performance of this system is good; I see about 5 - 10 % cpu load and almost no swap usage. I get immediate response from the system, except when I try to telnet to the nntp port. nntp readers simply time out; it takes forever until the INN prompt appears, if it appears at all. This situation changes when I throttle the INN. Then I get the INN prompt immediately. Using systat -vm, I have found out that it has 80 - 100 disk seeks per second on the disk that carries the history file (which is about 90 MB large). When I move the history file, it is the other disk that gets hit, so it definitely is the history file that causes this I/O. Could this be the reason for my problem ? Sometimes I see messages like this in the log: Sep 15 21:07:00 news innd: ME cant sendto CCreader bytes 4 No such file or directory I don't know if this is relevant here. Any experiences on how to deal with that ? Suggestions are welcome. Michael
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