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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!cpk-news-hub1.bbnplanet.com!news.bbnplanet.com!ais.net!uunet!in1.uu.net!204.147.226.2!quack!quack.kfu.com!nsayer From: nsayer@quack.kfu.com (Nick Sayer) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: How to increase size of vn-device swapfile? Date: 28 Apr 1997 20:58:03 GMT Organization: The Duck Pond public unix - http://www.kfu.com/ Lines: 46 Message-ID: <5k330r$qcs$1@phoenix.kfu.com> References: <5jf770$mbj@chenab.lums.edu.pk> NNTP-Posting-Host: quack.kfu.com X-Newsreader: NN version 6.5.1 (NOV) Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:39966 aslam@lums.edu.pk (Sohail Aslam) writes: >I followed the instructions in the FAQ on adding a vn-device to increase >swap size: > 1. create a vn-device > cd /dev; sh ./MAKEDEV vn0 > 2. create a swapfile (/var/swap0) > dd if=/dev/zero of=/var/swap0 bs=1024k count=64 > 3. put into /etc/rc.local the line > vnconfig -ce /dev/vn0c /var/swap0 swap >Questions: >1. How can increase the size of /var/swap0 (the file)? You must stop using it, then increase its size. >2. How can I disable swapping to the vn-device? You must remove the vnconfig from rc.local and reboot. >3. Is the performance of swapping/paging on a vn-device the same as on > a hard partition? It can't help but be a little less, since it has to figure out what blocks are swap rather than simply using a range. It's not so terrible, though. It interleaves the swap devices so that if they're on different spindles you can win from that. >For the time being, I created another vn-device (vn1c) and another 64MB >file in /var (swap1) and vnconfig'd swap on it. Ick. If you interleave two swap chunks on the same disk, you do a lot of seeking between them. >-- >Sohail Aslam >Department of Computer Science, Lahore University of Management Sciences (LUMS) >Lahore, Pakistan tel: 92-42-572-2670 fax: 92-42-572-2591 >email: aslam@lums.edu.pk -- Nick Sayer http://www.kfu.com/~nsayer/ | nsayer [at] quack [dot] kfu [dot] com | "Hate Crime" == "ThoughtCrime" UNSOLICITED BULK EMAIL IS UNACCEPTABLE | AND WILL BE CONSIDERED AS HARASSMENT |