Date: Mon, 24 Feb 1997 23:33:00 -0400 (AST) From: The Hermit Hacker <scrappy@hub.org> To: Carey Nairn <Carey.Nairn@ccd.tas.gov.au> Cc: Lennart Nilhov <lennart.nilhov@kagg.gy-edu.kalmar.se>, freebsd-questions@freebsd.org Subject: Re: ccd-driver Message-ID: <Pine.BSF.3.95.970224233201.12695e-100000@thelab.hub.org> In-Reply-To: <3.0.32.19970225103013.0070c8b8@falcon.pacit.tas.gov.au>
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On Tue, 25 Feb 1997, Carey Nairn wrote:
> At 19:06 24/02/97 -0400, The Hermit Hacker wrote:
> >On Tue, 25 Feb 1997, Carey Nairn wrote:
> >
> >> If you want to mirror one disk on another (i.e. make an exact duplicate)
> >> then ccd is not the solution you want.
> >>
> > Why not? I'm personally using it to strip 5 disks into one file
> >system for news, but according to the man page(s), ccd does support
> >mirror'ng...
> >
>
> from the ccd man page...
>
> The ccd driver provides the capability of combining one or more
> disks/partitions into one virtual disk.
>
> I didn't see anything about using ccd to mirror. If you can point me to
> the relevant man page I would happily be corrected on this point.
>
i've just checked 'man ccdconfig' on both 2.2-current of last
year sometime, as well as my current 3.0-current machine, and both state:
A ccd is described on the command line and in the ccd configuration file
by the name of the ccd, the interleave factor, the ccd configuration
flags, and a list of one or more devices. The flags may be represented
as a decimal number, a hexadecimal number, a comma-separated list of
strings, or the word ``none''. The flags are as follows:
CCDF_SWAP 0x01 Interleave should be dmmax
CCDF_UNIFORM 0x02 Use uniform interleave
CCDF_MIRROR 0x04 Support mirroring
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
CCDF_PARITY 0x08 Support parity (not implemented yet)
The format in the configuration file appears exactly as if it were en-
tered on the command line. Note that on the command line and in the con-
figuration file, the _f_l_a_g_s argument is optional.
#
# /etc/ccd.conf
# Configuration file for concatenated disk devices
#
# ccd ileave flags component devices
ccd0 16 none /dev/sd2e /dev/sd3e
FreeBSD July 17, 1995 2
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