topic Re: SCSI ID's in Operating System - HP-UX

SCSI ID's

Gavin Westermann — Tue, 21 Jan 2003 19:10:13 GMT

This from my K420 running 11.11. Two hard drives inside and two outside. I want to put the two IBM drives inside the box but cannot figure out what the SCSI ID's of the Seagates are so they don't conflict.

10/0.5 target
10/0.5.0 disk SEAGATE ST34371W
10/0.6 target
10/0.6.0 disk SEAGATE ST34371W
10/0.7 target
10/0.7.0 ctl Initiator
10/4 bc Bus Converter
10/4/0 tty MUX
10/4/4 ext_bus HP 28655A - SE SCSI ID=7
10/4/4.0 target
10/4/4.0.0 disk IBM DFHSS4W
10/4/4.2 target
10/4/4.2.0 disk IBM DFHSS4W

Any help or suggestions are appreciated.

Gavin

Re: SCSI ID's

A. Clay Stephenson — Tue, 21 Jan 2003 19:14:24 GMT

Your Seagate drives 10/0.5.0 = 5 and 10/0.6.0 = 6 are on a different SCSI bus than your IBM drives so there is no conflict regardless of the settings.

Re: SCSI ID's

Patrick Wallek — Tue, 21 Jan 2003 19:15:34 GMT

You 2 Seagte drives are at SCSI ID 5 & 6. In the path 10/0.5.0, the SCSI ID is the middle number in the 3 after the '/'.

Your 2 IBM disks are at SCSI ID 0 & 2.

Re: SCSI ID's

Jeff Schussele — Tue, 21 Jan 2003 19:17:37 GMT

Hi Gavin,

The SCSI ID is normally set in the enclosure(s) - not on the drive itself. Right now the Seagates are at SCSI IDs 5 & 6 on HW path 10/0. The IBMs are at 0 & 2 on HW path 10/4/4.
There should be no problem moving them where you want them ...UNLESS... you already have LVM structures created on them. Then you'll have to vgexport -s them prior to move & vgimport -s them back afterwards.

We normally try to avoid using K-class internal drives because they are NOT hot swappable. But that's entirely up to you.

Re: SCSI ID's

Robert-Jan Goossens — Tue, 21 Jan 2003 19:19:07 GMT

Hi,

/dev/dsk/c2t5d0 (10/0.5.0)
/dev/dsk/c2t6d0 (10/0.6.0)
Id is 10/0.5.0 5
10/0.6.0 6

Robert-Jan.

Re: SCSI ID's

fg_1 — Tue, 21 Jan 2003 19:20:24 GMT

Gavin

Your ibm disk if you added them inside the box would not conflict since your 2 other drives are:

10/0.5.0 is equal to SCSI ID 5
10/0.6.0 is equal to SCSI ID 6

Your 2 IBM drives are currently:

10/4/4.0.0 is equal to SCSI ID 0
10/4/4.2.0 is equal to SCSI ID 2

No problems here since they are 2 different SCSI Bus Paths.

Gl

Frank G.

Re: SCSI ID's

Gavin Westermann — Tue, 21 Jan 2003 19:31:42 GMT

Thanks for the quick response all. I do intend to move them to the inside of the box and add another. In previous attempts to install another drive on the same bus as the Seagates the system would not boot or even see the drives. This may have been my fault not being clear on how to determine the ID's on the internal existing drives

Thanks

Re: SCSI ID's

Eugeny Brychkov — Tue, 21 Jan 2003 19:36:05 GMT

Gavin,
ioscan output can be considered as tree-like structure. First comes hardware path where HBA (host bus adapter) is installed:
10/0
10/4/4
then SCSI Id, and then LUN (logical unit) number. Note that physical disks always have LUN=0.
If you see class of deivce='disk' then it's physcial drive, if you see 'sctl' then it's SCSI controller, if you see 'target' then this means that device with this SCSI id exists on the bus. Indeed:
10/4 bc.... bus convertor, it's circuit between processor and I/O modules;
10/4/0 tty mux .... mux device connected to the port 0 of bus converter;
10/4/4 ext_bus (bus extender on bc's port 4), as seen from description it's SE card having SCSI id=7. As prove we should see somewhere in ioscan output 10/4/4.7.0 sctl;
10/4/4.0 target ... device with this SCSI id is present on the bus;
10/4/4.0.0 disk ... this device on the bus was identified as hard disk
etc etc etc
Eugeny

Re: SCSI ID's

A. Clay Stephenson — Tue, 21 Jan 2003 21:20:06 GMT

Hold on there - you can't move these drives inside!!!
Note that they are currently connected to a SE-SCSI controller thus I suspect your IBM drive are LVD (which is compatible wit SE); however, the internal drives on a K-box must be HVD (Hi-Voltage Differential) SCSI which is not compatible with either SE or LVD SCSI. Connecting this equipment can dage drives, controllers, and terminators!!!

Re: SCSI ID's

Gavin Westermann — Tue, 21 Jan 2003 21:32:55 GMT

I will take a good look at the IBM DFHS SCSI drives to check for that before I try to install them inside. Thanks for the heads up on that one. Might have saved me some big headaches.

Gavin

Re: SCSI ID's

Gavin Westermann — Wed, 22 Jan 2003 03:13:03 GMT

From what I am reading on these drives so far you are correct, they do not seem to be HVD. Thanks for that heads up.