Replacing the hard drive - which SCSI id?

[dictum9]

rx4640 running 11.23

I have 2 internal hard drives, and one of them went bad. It's c3t0d0 (0/1/1/1.0.0)
But looking at the server, I cannot figure out which one to replace, the one on top or the bottom. The one on the bottom says 0 and top 1. What does that mean?
Also one of them has a flashing light?


disk 1 0/1/1/0.1.0 sdisk CLAIMED DEVICE HP 73.4GMAX3073NC
/dev/dsk/c2t1d0 /dev/dsk/c2t1d0s3 /dev/rdsk/c2t1d0s2
/dev/dsk/c2t1d0s1 /dev/rdsk/c2t1d0 /dev/rdsk/c2t1d0s3
/dev/dsk/c2t1d0s2 /dev/rdsk/c2t1d0s1
disk 2 0/1/1/1.0.0 sdisk CLAIMED DEVICE H 73.4GMAX3073NC
/dev/dsk/c3t0d0 /dev/dsk/c3t0d0s3 /dev/rdsk/c3t0d0s2
/dev/dsk/c3t0d0s1 /dev/rdsk/c3t0d0 /dev/rdsk/c3t0d0s3
/dev/dsk/c3t0d0s2 /dev/rdsk/c3t0d0s1

[dictum9]

Correction - of them has a light that's totally off, ID "1", the one on top. Is that the bad hard drive which correlates to c3t0d0?

[Robert Salter · Accepted solution]

You can dd to verify which disk is which,i.e.
dd if=/dev/dsk/c2t1d0 of=/dev/null bs=1024
will hit the good disk (in your case), just check the disk and see if the light is on steady.

Good luck,

Robert

[Jaime Bolanos Rojas.]

etc,

when it comes to physically determining good drives and bad drives,

Flashing green is always good.
Flashing red or amber is never good.
NO flashing is like dead.

Regards,

Jaime.

[dictum9]

I can try dd. But can't you infer this info from the hardware path?

[dictum9]

I did dd and was able to tell from the
flashing light which drive it was accessing.

[Sameer_Nirmal]

Assuming your diagnostic about the bad disk
c3t0d0 (0/1/1/1.0.0) is right. The identification of the actual physical disk could be done looking at the h/w path or device file.

In rx4640, the slot 1 ( lower one ) has SCSI ID 0 and slot 2 ( Upper ) one has SCSI ID 1. Refer the doc at page 34.
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00112414/c00112414.pdf

As per the h/w path and device file, the target ID is 0, so the disk at the slot 1 is in picture. Morever verification could be done using the physical inspection of LEDs and using "dd" command as stated above.

In some models, you need to follow the docs and above methods to map the physical drive with its h/w path or device file. Earlier HP used to embose ot sticker the h/w path next to physical disk. Now on this server, marking of 0 and 1 indicates the SCSI IDs.