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Conference ssdevo::hsz40_product

Title:HSZ40 Product Conference
Moderator:SSDEVO::EDMONDS
Created:Mon Apr 11 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:902
Total number of notes:3319

794.0. "Will a SWXRC-04 give performance problems on Digital Unix V3.2G ?" by OSL09::NILSTAD () Wed Mar 05 1997 04:22

Hi

We have a customer that are useing a SWXRC-04 connected to
a AS4100 with DU V3.2G. It seems to be working, but when using
the file command on a raid disk on the SWXRC-04 ,# file /dev/rrza8c, 
it reports back that the disk is a RZxx. 
Will this give any performance hit?.


Regards
Kjell-Magne Nilstad
DIGITAL Norway
T.RTitleUserPersonal
Name		DateLines
794.1SSDEVO::ROLLOWDr. File System's Home for Wayward Inodes.Wed Mar 05 1997 10:2910
	It might.  When the SCSI driver doesn't recognize a disk
	it calls it "RZxx".  The default options for such a device
	may be more limited than for one it recognizes, probably
	a lack of tagged command queueing when that is otherwise
	supported.  You may want to adapt the HSZ40 entry in the
	/sys/data/cam_data.c file to recognize the controller by 
	its other name and that should get all the same options.

	This file is reasonably commented, so adapting an existing
	entry shouldn't be hard.
794.2SMURF::KNIGHTFred KnightWed Mar 05 1997 10:2915
Yes, it will create a performance hit.  The engineering/marketing
group for the H/W specifically decided to NOT support the SWXRC
variant on Digital UNIX (or any on-base system for that matter).

To make it work, you need to edit the /sys/data/cam_data.c file
to create an entry for your SWXRC device.  Use scu to look at
the inquiry data, then make an entry exactly like the HSZ40 entry
but with the inquiry string fields changed.  Just look at the
difference between the HSZ40 and HSZ20 entries to get an idea
of what you need to change.

Support may be another issue depending on the current stand that
the H/W engineering/marketing groups are taking.

	Fred Knight
794.3OSL09::NILSTADThu Mar 06 1997 12:213
Tanks !!

KMN