new scsi disk

[icahn]

When inserting a new scsi disk into an empty hot-swap bay in an F50 (AIX 4.3.3), are there any switches or jumpers I have to set before inserting the disk? On this particular machine, I'm told that there are not enough scsi addresses to allow a new disk to be configured into the system ("because the high bit in the scsi id is not set&quot. How can I verify this?

Currently I have,

# lscfg -l scsi*
DEVICE LOCATION DESCRIPTION
scsi1 30-58 Wide SCSI I/O Controller
scsi0 10-60 Wide SCSI I/O Controller
# lsdev -C -s scsi
hdisk0 Available 10-60-00-0,0 16 Bit SCSI Disk Drive
hdisk1 Available 10-60-00-1,0 16 Bit SCSI Disk Drive
hdisk2 Available 10-60-00-2,0 Other SCSI Disk Drive
hdisk3 Available 10-60-00-3,0 Other SCSI Disk Drive
hdisk4 Available 10-60-00-4,0 Other SCSI Disk Drive
ses0 Available 10-60-00-14,0 SCSI Enclosure Services Device
cd0 Available 10-60-00-5,0 SCSI Multimedia CD-ROM Drive
rmt0 Available 10-60-00-6,0 SCSI 4mm Tape Drive

With wide SCSI, I should be able to connect 15 devices. Wouldn't cfgmgr assign the new disk to location 10-60-00-15 without setting any switches?

 

[MoshiachNow]

Yes,Normally it should be done automatically.

Who tells you can not - is it some system message ?
what does it say exactly ? "Long live king Moshiach !"
h

http://www.noahide.com/movement.htm

 

[icahn]

There is supposed to be a switch on the backplane of the H50 to which all the disks are connected. If this switch is set to "low", the new disk might create scsi address conflicts. If reset to "high", the existing disk addresses will be changed (from 0-4 to the 8-13 range). That way the disk will be auto-configured by cfgmgr, but we are not sure what effect that may have on the OS, for e.g. in the bootlist.

We switched providers for aix support and now getting this difference in opinion.

 

[Yegolev]

I forget where the jumper is, but from your addresses it seems like someone set you to low addresses. Factory default is high. I don't remember the details so I suggest looking in the H50 Service Guide (not User's Guide), back in the part with the hardware diagrams. If no help there, perhaps your support people can help you find it. Pretty sure it's on the back of the six-pack.

I would not bother changing it, myself, if you can attach the DASD to a different adapter. Note the address of hdisk0 is 10-60-00-0,0 which means that if you have another six-pack it should plug into, uh, 10-78 I think, so a 10-78-00-0,0 will be a different address since it is on a different adapter. Your actual address may vary, since I don't remember the address of the second integrated SCSI controller.

If you do not wish to obtain a second six-pack, well then you are out of SCSI addresses. Note that 10-60...0,0 through 0,6 are used. 0,7 is used by the adapter.

 

[gheist]

You should run diag when you are hotplugging disks in working system

If you plug the new disks in halted system - they apear as new disks when you boot up

When you unplug disks - first move data from them and remove physiscal disk from vg

ONLY If you are working with non-hotswappable disks - you will need to adjust a wheel with numbers on back side of disk to reflect its new SCSI ID