*BSD News Article 86531


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From: mi@rtfm.ziplink.net (Mikhail Teterin)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Optimum ccd
Date: 15 Jan 1997 15:35:10 GMT
Organization: Aldan at Newton Upper Falls
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Hello everybody!

I managed to create the ccd disk out of for CONNER CP30540 disks
(0.5G). The I/O is about 2.5 times faster then that of the individual
drives. However, I expected a near to 4 factor.

Should I keep experimenting with ileave-number, or 2.5 is considered
pretty good?

The drives are attached to the dual channel aic7770, two drives
per channel.  (Does it make sence to split the load over the
channels?)

Another thing. If there is a need to fsck the /dev/rccd0c, fsck
will hang the system :( I found that using c-partitions of my drives
for ccd is _wrong_, but do not know exactly how to change the
situtation:  ccd0    192     none    /dev/sd2s1c /dev/sd3s1c
/dev/sd4s1c /dev/sd6s1c

And it works if the /ccd was cleanly unmounted (no fsck neccessary)...
All the drives are "Dangerously allocated", because there are no
other OSes on this machine.

I'll appreciate all the hints from those who use ccd succesfully.
Thanks!

	-mi
-- 
	"Windows for dummies"