Date: Sat, 21 Nov 1998 19:05:59 -0600 From: Stormy Henderson <stormy@futuresouth.com> To: "original recipient in envelope at chain.freebsd.os.org.za" <questions@FreeBSD.ORG> Subject: Re: How to use ccd Message-ID: <19981121190559.D303@futuresouth.com> In-Reply-To: <Pine.BSF.4.05.9811220244590.3324-100000@chain.freebsd.os.org.za>; from Khetan Gajjar on Sun, Nov 22, 1998 at 02:50:33AM %2B0200 References: <Pine.BSF.4.05.9811220244590.3324-100000@chain.freebsd.os.org.za>
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A happy camper (Khetan Gajjar, khetan@chain.freebsd.os.org.za) once wrote...
> I've got two SCSI drives I'd like to make into one partition, in order
> to write CD-ROM 660+ MB images to. The drives are not identical. DMesg
> output is listed below. What would the correct interleave number be for
> this scenario ?
> da0: <QUANTUM LPS540S 5900> Fixed Direct Access SCSI2 device
> da0: 516MB (1057616 512 byte sectors: 64H 32S/T 516C)
> da1: <CONNER CFA540S 14B1> Fixed Direct Access SCSI2 device
> da1: 515MB (1056708 512 byte sectors: 64H 32S/T 515C)
I'm a newbie, but I just did this two days ago, and it worked for me.
The manpage for ccd says, "For large writes, the optimum interleave factor
is typically the size of a track, while for large reads, it is about a
quarter of a track." Since you won't need as much speed on reads when
writing CDS, use a quarter. Both of your drives are 32 sectors per track
with 512 byte sectors, so try an interleave of 8.
> Would a ccd partition of da0 and da1 combined together be a good
> enough "drive" to use when creating and burning CD-ROM images ?
> Once created, I presume the command to create these two partitions into
> one would be
> ccdconfig -cv ccd0 [interleave value] 0 /dev/da0s1e /dev/da1s1e
And put it into /etc/ccd.conf, here's mine:
ccd0 16 none /dev/da0s2e /dev/da1s2e
> Would this then be mounted with mount /dev/ccd0 /mnt ?
After you "newfs -b 8192 -i 1024 /dev/rccd0c", then you "mount /dev/ccd0c
/mnt". The newfs will give an error message after it is done, just ignore
it, it still worked.
Be happy...
--
http://www.futuresouth.com/~stormy/signature.html
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