Date: Mon, 17 Nov 2008 17:59:00 +0100 From: "Paul B. Mahol" <onemda@gmail.com> To: "Sossi Andrej" <asossi@dotcom.ts.it> Cc: freebsd-stable@freebsd.org Subject: Re: swap_pager: indefinite wait Message-ID: <3a142e750811170859o226d3d91r45ac4106821e6fae@mail.gmail.com> In-Reply-To: <49219959.8040209@dotcom.ts.it> References: <49219959.8040209@dotcom.ts.it>
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On 11/17/08, Sossi Andrej <asossi@dotcom.ts.it> wrote: > Hello, > I manage a www (apache), database (postgresql) and e-mail (qmail) with > about 100 Internet domains. > We recently purchased a DELL MD3000i server with data access through > ISCSI protocol. > I installed a new server with FreeBSD 7.0 compiled kernel with ISCSI > (v. 2.1) and SCHED_ULE scheduler. > The server's local disk configuration is: > 512 MB / > 1024 MB SWAP > 254 MB / var > 2048MB / var/ qmail > 512 MB /tmp > ~ 70 GB /usr > > The apache data (/usr/local/www), postgre (/usr/local/pgsql) and qmail > (/usr/local/vpopmail) are instead on the partition on ISCSI. After > installing all the necessary softwares I tested the machine as mail > server for a one domain and everything worked fine for 2-3 days. > I wanted to test the correct functioning of qmail and of the > reading/writing on ISCSI. On the end of testing I decided to transfer > all of data (www, DB and e-mail) on the FreeBSD 7.0. I compressed all > the data on the original server (on tar.gz format). I transferred them > on the new server and started to decompress the files. Www data have > been decompressed correctly on the ISCSI disk. But while the messages > were being decompressed (~80GB of tar.gz) and all the DB were being > restored, the server crashed. Which application were used for decompression? > The error shown was: > > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 31, size: 4096 I believe this can happen any time when to much of swap partition is used. If this sort of thing happens often, review memory management of application(s) that is causing such scenario, if that is application fault - you have two choices: get more RAM (this may not always help) or use another application. Increasing swap partition will not help much .... > This message repeated every 30 seconds. > While restarting with the single user mode I checked there wasn't any > message after the crash in /var/log/messages. > > I think 1GB of swap should be enough, since with this configuration on > FreeBSD 5.5 everything worked for over 270 days without reboot. > The local disks are 2 of ~80GB in RAID 1 (mirror) with Gmirror > before installing FreeBSD I tested the 2 disks with the badblocks > software on Slackware which didn't find any r/w error. > > Can somebody help me understand why the system crashed this way or how > to avoid future crash? > It's a production server and I can't afford an out-of-service or data loss. > > Thank you very much and kind regards. > > -- > Sossi Andrej > ------------------------- > DotCom Information technology > > Via Biancospino, 9 > 34151 - Opicina (TS) > Italy > > tel: +39 040 2158191 > fax: +39 040 0641954 > E-mail: asossi@dotcom.ts.it > ---------------------------- > > Ai sensi del D.lgs n. 196 del 30.06.03 (Codice Privacy) si precisa che > le informazioni contenute in questo messaggio sono riservate e ad uso > esclusivo del destinatario. Qualora il messaggio in parola Le fosse > pervenuto per errore, La preghiamo di eliminarlo senza copiarlo e di non > inoltrarlo a terzi, dandocene gentilmente comunicazione. Grazie > > This message, for the D.lgs n. 196 / 30.06.03 (Privacy Code), may > contain confidential and/or privileged information. If you are not the > addressee or authorized to receive this for the addressee, you must not > use, copy, disclose or take any action based on this message or any > information herein. If you have received this message in error, please > advise the sender immediately by reply e-mail and delete this message. > Thank you for your cooperation. > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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