Question about DEC (SNKZPCAAX) SCSI Controller

6 Answers

Two disks appear with multiple addresses on DEC 3000-900

I have two 9.1-GB disks installed on a DEC 3000-900.
They are set for DKA200 and DKA300. Originally, they were set using the jumpers on the Disks as DKA0 and DKA100.
The CD-ROM isconfigured as DKA400.

Despite reconfiguring the jumpers, the show dev command lists the following BOOTDEVs and Addresses. Nothing lists for the CD-ROM.
BOOTDEV ADDRS DEVTYPE
DKA0 A/0/0 DISK
DKA100 A/1/0 DISK
DKA200 A/2/0 DISK
DKA300 A/3/0 DISK
A/4/0 (No Boot Dev or Type listed)
(This is the CD-ROM)
DKA500 A/5/0 DISK
DKA600 A/6/0 DISK

The system will not boot successfully from either the CD-ROM or Disk 200.

Are the mulitple addresses for the two disks confusing the system?
How do I get rid of the multiple addresses?

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The initial Boot Partition is corrupted.
You must change the boot order.
-in the bios of the Workstation check if you have a "boot device"option, (different than the boot priority) several chipset have this option, you can chose between added controller or integrated one.
-Check in the documentation the priority of each slots, you may have inserted the array controller on a slot with higher priority then the internal controller, changing slot will change priority.
-try to perform a clear cmos, some times, old information can prevent the machine to boot from some devices.

Thank you for using FixYa!

Posted on Feb 07, 2009

  • blueextc3221
    blueextc3221 Feb 07, 2009

    CLICK HERE for your owner's guide.



    CLICK HERE for your service information guide.



    If your system has been asking for the time recently on boot-up please check the CMOS battery!!

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It sounds like he has twin scuzzy raid drives, they are just either run in raid array. They must be set up to run in a raid setup, where tehy both run identical data for 2 reasons, the speed and the ability to be redundant, in case one goes that has mission critical data, it won't get lost. The drives may run at 10,000 rpms if he has the running of a scuzzy card,I just googled it, they were quite the rage n their day, back when 5400rpm drives were considered fast at 10,000

Posted on Feb 06, 2009

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Each IDE/ATA channel can support either one or two devices. IDE/ATA devices of course each contain their own integrated controllers, and so in order to maintain order on the channel, it is necessary to have some way of differentiating between the two devices. This is done by giving each device a designation as either master or slave, and then having the controller address commands and data to either one or the other. The drive that is the target of the command responds to it, and the other one ignores the command, remaining silent.

please add some comment and give more information.
Thanks 

Posted on Feb 06, 2009

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Check for the ID number for the controller. You have an ID conflict. How many devices are on the bus?

I can check my machine at home later today if you can't find the conflict.

Dan

Posted on Feb 06, 2009

  • 1 more comment 
  • ABRsvcs Feb 06, 2009

    OK. The default address for the controller in those machines is 6. Check the removable plastic numbers to be sure that none of the fingers have broken off. This was a common fault when changing the bus IDs.



    More to come.



    Dan

  • ABRsvcs Feb 07, 2009

    Can you post the boot log. In other words show here what you see on the screen. I think that R5 may not be set properly in the boot sequence.



    Dan

  • ABRsvcs Feb 09, 2009

    My error. I had DSSI on the brain. The problem is esentially the same though. The default bus ID for the controller is 6. The showing of multiple devices indicates either multiple devices responding to the same ID or an unterminated SCSI bus. Check for the correct terminator.



    Dan

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Check scsi cable and connectors.

If you cannot fix the problem by changing jumper settings, try replacing scsi cable to CD. Or swapping cables.

The disk not booting can be a different system problem.

Try changing jumper settings and using SCSI configuration utility first.

Posted on Feb 06, 2009

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Looks like it can't find the right disks/partitions to boot from.
The order may be being re-arranged when you attach them all at once.
Could be an issue with identification, are you using device paths
what's your boot setup? Where is the boot manager
installed ....

Posted on Feb 06, 2009

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