Date: Fri, 12 Apr 1996 14:11:32 -0400 (EDT) From: Charles Owens <owensc@enc.edu> To: Satoshi Asami <asami@CS.Berkeley.EDU> Cc: stable@FreeBSD.ORG, SCSI@FreeBSD.ORG Subject: Re: Disk Mirroring Message-ID: <Pine.FBS.3.92.960412141056.10948C-100000@dingo.enc.edu> In-Reply-To: <199604102312.QAA19403@sunrise.cs.berkeley.edu>
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On Wed, 10 Apr 1996, Satoshi Asami wrote: > * Is there a way to mirror two disks in FreeBSD? The two different > * possibilities are at the driver layer or at the filesystem layer. > * I imagine the driver layer would be the easiest. Just take the > * block to be written and write it out to both disks. The reason I > * suggest the filesystem layer is to avoid duplicating the swap space > * on both disks. It would be cool if the boot code could > * automatically deal with either disk failing and still having the > * system boot. Naturally, the driver should be able to deal with > * either disk failing. Has anyone given this some thought? With > * disks getting real cheap, it is a good way to have some fault > * tolerance with out the cost or performance hit of RAID. (Actually, > * I think mirroring is one form of RAID.) > > There is a driver called "ccd" (concatenated disk) that I ported from > NetBSD. It is designed primarily for striping disk arrays but it has > mirror support so you can use it to mirror partitions by just making > it a mirrored 2-disk array. :) > > Please take a look at > > http://stampede.cs.berkeley.edu/ccd/ > > for details. I'm planning to put it into -current soon but there's a > 2.1R version too. > Any chance that you'll do a -stable version anytime soon? --- ------------------------------------------------------------------------- Charles Owens Email: owensc@enc.edu "I read somewhere to learn is to Information Technology Services remember... and I've learned that Eastern Nazarene College we've all forgot..." - King's X -------------------------------------------------------------------------
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