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OpenVMS Hobbyist Program | Alpha Systems Forums | Alpha Hardware Forum
Author Question about scsi raid controller (mylex dac960)

Posts: 28
Location: Sofia, Bulgaria
Joined: 02.01.06
Posted on March 20 2006 11:00
In my alphaserver 1200 I have a three channel SCSI RAID controller mylex DAC960. But I can not determine what EXACTLY it is. There are a lot of stickers on it but most important are:
1. DEC part N: KZPSC-UX
rev: C02

2. DEC part N: KZPAC-XF
rev: E03

AFAIK KZPAK is ultra/wide (which means 20MHz 16bit) and KZPSC is fast/wide (10MHz 16bit). The question is what exaclty interfaces supports this one (is it ultra or fast)? How can I determine? Now I'm running the ra200rcu utility and in the "controller setup" menu -> "SCSI Xfr Paramethers" -> I can choose the transfer rate between 5 and 10 MHz - maybe is the KZPSC? But there is also Max. (maybe 20MHz? or again 10MHz) and Async. (what means that?). The RCU utility itself says that is KZPAC... but I'm not sure because of the stickers and the possible speed selection.
It is so bothering me this question because I have two failed drivers and I want to replace them and I found two 80pin 18G drives:
ST-318203LW Ultra2 SCSI Wide (Cheetah 18LP, LVD)
Can they work with mine DAC960? In which case - if it is KZPAC, KZPSC or not a chance at all? If I connect them to test - can this damage the controller or the drives?
109218396 http://azonmedia.com

User Avatar

Posts: 277
Location: UK
Joined: 24.02.06
Posted on March 25 2006 22:32
Ultra SCSI2 drives can choose to run slower at Ultra speeds. I don't know about LVD (low voltage differential SCSI). The KZPAC expects Single End (not differential scsi)

Posts: 28
Location: Sofia, Bulgaria
Joined: 02.01.06
Posted on April 03 2006 23:43
Thanks Ian,
I have read in the wikipedia about the SCSI, and there was clearly stated that the SCSI is backward compatible (if the connector is the same). But I brought two older drives (SCSI-3) and they are working fine now (I find the SCSI standarts/docs confusing and preffered not to risk with LVD).
But the transfer from the drives (IMHO) is low - 6-10mb/s. I tested with hdparm (under Alpha Core) - no difference between RAID-1 and JBOD (I expected RAID-1 to be a little faster in reading than JBOD). All drives are 7200rpm, SCSI-2 are the drives in the RAID-1, and SCSI-3 - in the JBOD.
I expected to be somewhere around 15mb/s at least for the RAID. Now I'm reading the OpenVMS docs about MONITOR (DISK). Can it provide the transfer rate in mb/s (if I put the disk under load - some file transfer)? Or another way?
I'm just curious about this...
109218396 http://azonmedia.com
Author RE: Question about scsi raid controller (mylex dac960)

Posts: 5
Joined: 12.02.09
Posted on April 24 2013 16:17
That question I can answer. Your controller is a KZPAC-XF. The part number KZPSC-UX is the cache memory module. The cache memory module may have a backup battery which is required if you are going to do asyncronous writes. The battery is probably long since expired.

Richard Loken VE6BSV
Athabasca, Alberta
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