Date: Tue, 8 Oct 1996 10:53:57 +0200 (EET) From: mika ruohotie <bsdscsi@shadows.aeon.net> To: asami@freebsd.org (Satoshi Asami) Cc: pjchilds@imforei.apana.org.au, freebsd-scsi@freebsd.org Subject: Re: striping/mirroring? Message-ID: <199610080853.KAA03301@shadows.aeon.net> In-Reply-To: <199610080601.XAA01024@silvia.HIP.Berkeley.EDU> from Satoshi Asami at "Oct 7, 96 11:01:22 pm"
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> > Actually, it would be better if you write your ccd.conf entry as > ccd0 <interleave> CCDF_MIRROR disk1 disk3 disk2 disk4 > > That would make disk1 and disk3 the data disks and disk2 and disk4 the > mirrors. Reads only come from the first half, so we want to spread > those between both controllers. does this work already? (i cant experiment yet, disks are on purchase list i have to get signed before i get the disks) and am i right assuming (some old post listed these) that 128 is the interleave value that gives me most speed for reads? question, do i have to mirror as many drives as i am striping? since i'd rather strip to 3 and mirror to one... (living close to the edge... =) ) > * Advantages are reasonable speed, and a measure of safety. If one disk > * fails then you can just "turn-off" ccd and continue on with the other > * good pair of disks. it's this simple? nothing lost? sounds cool... =) > Yes...but I would recommend you keep at least one spare disk that you > can substitute as soon as you find out you have a bad disk. (Ideally, > this spare disk should be already connected so you can immediately > start your recovery procedure.) Use "dd" to make a copy of the whole > disk. but if the spare is online, and running there's the chance it is broken already... and since it just hangs there i would not know it until... > Satoshi mickey
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