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Newsgroups: comp.unix.bsd.bsdi.misc Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.cs.su.oz.au!metro!metro!munnari.OZ.AU!news.ecn.uoknor.edu!news.cis.okstate.edu!newsfeed.ksu.ksu.edu!news.physics.uiowa.edu!newsrelay.iastate.edu!vixen.cso.uiuc.edu!uwm.edu!lll-winken.llnl.gov!nntp.coast.net!zombie.ncsc.mil!news.mathworks.com!newsfeed.internetmci.com!in2.uu.net!news.new-york.net!ritz.mordor.com!ritz From: ritz@ritz.mordor.com (Chris Mauritz) Subject: Re: Can BSDI 2.0 handle 9GB SCSI Drives? X-Newsreader: TIN [UNIX 1.3 950824BETA PL0] Lines: 66 Organization: Mordor International Message-ID: <Dr0vu0.3pC@ritz.mordor.com> References: <4mevk2$a2o@news.hal-pc.org> <4mmkdg$jsb@strange.dfwmm.net> Date: Tue, 7 May 1996 06:39:35 GMT Brian Wolfe (ahzz@dfwmm.net) wrote: : In message <4mevk2$a2o@news.hal-pc.org> - jhupp@black.gensys.com (Jeff Hupp) wr : ites: : >In article <cnordin.831100316@news.vni.net>, : > cnordin@hq.vni.net (Craig Nordin) writes: : >>jsloan@LiveNet.Net (Jim Sloan) writes: : >> : >>>................................................. It is better to have : >>>several smaller drives than one large drive for usenet news server. : >> : >>Yes yes yes yes yes!!! : >> : > And its even better to be running several smaller drives as one : >file system using the ccd driver... : > : >-- : >Windows '95; 386 performance from your Pentium. : >Jeff Hupp <Jhupp@gensys.com> <http://gensys.com> : >PGP Public Key available at http://gensys.com or on the key servers : : : : ??? I have heard of this file system driver that allows a raid 0 (stripeing) : approach to useing disks. I am running a 16Gb news server and Need to make : more efficent use of the disks. : : Please post here or emailme at mailto:ahzz@dfwmm.net if you know exactly how : to do this with the domestic bsdi 2.1 I think the ccd driver is a FreeBSD/NetBSD thing, not BSD/OS. It is apparently in pre-alpha testing now, though I'm told it is working very well. From the latest README: (3) What it does In case you don't know what it is, ccd is a disk array driver. You can combine several disk partitions into one "virtual disk". Then you can partition it or use the whole thing or add some pepper and salt or whatever you want. (4) What it does not There is no parity support yet. That's why its name doesn't resemble RAID in any form. However, there is mirroring available starting from the Jan/31 version. (4a) Cool, how do I use mirroring? Add CCDF_MIRROR to the list of flags (third field in /etc/ccd.conf), and your disk space will magically shrink into half. The writes go to all disks, while the reads will all come from the first n/2 disks. If one of the disk goes "poof", you can reconfigure the ccd to use only half the disks without mirroring. That should keep your users happy until you get the chance to put in the replacement disk. When the new disk is installed, use the ccd recovery program called `dd' (which mysteriously made its way into the release even before we put out an alpha version of ccd), e.g., to copy sd1g to sd4g, dd if=/dev/sd1g of=/dev/sd4g bs=1048576 :-) Hope that helped. Chris -- Christopher Mauritz | For info on internet access: ritz@mordor.com | finger/mail info@ritz.mordor.com OR Mordor International | http://www.mordor.com/ 201/212/718 internet access | Modem: (201)433-7343,(212)843-3451