Date: Fri, 1 Mar 2002 16:37:58 -0600 From: Glenn Johnson <gjohnson@srrc.ars.usda.gov> To: trini 0 <gms08701@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: ccd Message-ID: <20020301223758.GA990@node1.cluster.srrc.usda.gov> In-Reply-To: <20020301194855.5431.qmail@web13108.mail.yahoo.com> References: <20020301194855.5431.qmail@web13108.mail.yahoo.com>
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On Fri, Mar 01, 2002 at 11:48:55AM -0800, trini 0 wrote:
> Im trying out ccd for the first time. Im following instructions on
> freebsddiary, and the ccd man page. I have ccd in the kernel.
> snip from dmesg:
> ccd0-3: Concatenated disk drivers
>
> snip from dmesg:
> ad2: 26105MB <IBM-DPTA-372730> [53040/16/63] at
> ata1-master UDMA33
> ad3: 26105MB <IBM-DPTA-372730> [53040/16/63] at
> ata1-slave UDMA33
>
> --------------------------------------------
>
> I ran
> disklabel -r -w ad2 auto
> disklabel -r -w ad3 auto
>
> then I ran disklabel -e on ad2 and ad3
> They look like this:
>
> # /dev/ad3c:
> type: unknown
> disk: amnesiac
> label:
> flags:
> bytes/sector: 512
> sectors/track: 63
> tracks/cylinder: 16
> sectors/cylinder: 1008
> cylinders: 53040
> sectors/unit: 53464320
> rpm: 3600
> interleave: 1
> trackskew: 0
> cylinderskew: 0
> headswitch: 0 # milliseconds
> track-to-track seek: 0 # milliseconds
> drivedata: 0
>
> 8 partitions:
> # size offset fstype [fsize bsize
> bps/cpg]
> c: 53464320 0 unused 0 0
> # (Cyl. 0 - 53039)
> e: 53464320 0 unused 0 0
> # (Cyl. 0 - 53039)
>
> ---------------------------------------
>
> Went to /dev and ran ./MAKEDEV ccd0 and the ccd family
> are there under /dev.
>
> Then Im stuck on this:
> hivemind# ccdconfig ccd0 32 0 /dev/ad2e /dev/ad3e
> ccdconfig: ioctl (CCDIOCSET): /dev/ccd0c:
> Inappropriate file type or format
>
> Anyone knows where Im going wrong?
A few things.
[1] You have both of your drives on the same IDE channel. This is not
ideal, particularly when setting up a striped volume as you are. The
reason is that the two drives on the same IDE channel can not be
accessed at the same time. You want to have each drive on separate
IDE channels, ie. both as masters. Your current configuration will
not keep it from working but will hinder performance significantly.
[2] You have to have the fstype field of partition 'e' set to '4.2BSD'.
[3] You probably want to put your config into a file called
'/etc/ccd.conf' so that your ccd0c volume can be started up at boot
time via the /etc/rc script.
Lastly, if you are using a recent version of FreeBSD, have a look at vinum.
--
Glenn Johnson
USDA, ARS, SRRC Phone: (504) 286-4252
New Orleans, LA 70124 e-mail: gjohnson@srrc.ars.usda.gov
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