Date: Fri, 18 Oct 1996 07:10:44 -0700 (PDT) From: asami@freebsd.org (Satoshi Asami) To: petzi@zit.th-darmstadt.de Cc: fs@freebsd.org, questions@freebsd.org Subject: Re: ccd setup for striping Message-ID: <199610181410.HAA13140@silvia.HIP.Berkeley.EDU> In-Reply-To: <v03007801ae8c5b837d22@[130.83.63.13]> (message from Michael Beckmann on Fri, 18 Oct 1996 00:20:04 %2B0200)
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* I have made a kernel with ccd support on two of my 2.1.5 systems, and made
* the ccd devices ccd0 through ccd4 . I would like to concatenate and stripe
* the disks which hold the newsspool on these servers. I have 4 drives with 2
* GB each, and they currently have filesystems on them like
*
* /dev/sd1s1e
* /dev/sd2s1e
* /dev/sd3s1e
* /dev/sd4s1e
*
* what must I do in order to prepare them for use with ccd ? The manpage
* speaks about devices named sd2e, sd3e, sd4e, which confuse me a bit. Do I
sd2e is an alias for sd2s1e (more precisely, sd2sNe where N is the
slice number of the first FreeBSD slice on that disk), etc. So either
is fine.
* need special disklabels ? Can I use the disks as they are ? I currently use
* the disks in their entirety for only one filesystem, no DOS partitions on
* them.
That's ok. Just make sure you have "4.2BSD" in the "type" field on
the disklabel.
You can put
ccd0 65536 ccd0 /dev/sd1e /dev/sd2e /dev/sd3e /dev/sd4e
^^^^^
this is the "interleave size", Rod Grimes recommends you make this
at least 65536 for news spools
in your /etc/ccd.conf, type "ccdconfig -Cv" (this is done
automatically next time you reboot), "newfs /dev/ccd0c", then mount it
anywhere you want.
* Another question I have is, can I use an odd number of disks for striping ?
* Is it advisable to use ccd if I want to concatenate (stripe) 3, 5 or 6 disks ?
No, as long as you don't turn on mirroring as well (in which case you
obviously need even number of disks).
Satoshi
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