Blast from the past: 4.0F device file naming rules

[Adam Garsha]

Does anyone remember what the naming convention for disks was back in good 'ol 4.0F?

e.g. rz+(some-letter)+....

which relates to Bus Target and LUN. I am googling around, but it isn't popping up quickly for me.

[Vladimir Fabecic]

rz ((SCSI ID) + (Bus number X 8))
For example:
disk with SCSI ID 5 bus 0: rz5
disk with SCSI ID 5 bus 1: rz13
disk with SCSI ID 1 bus 4: rz33

[Adam Garsha]

Thanks, so:

rze128c would be: ???

What is the "e" representing? LUN?

So is it?:

rze128c: BUS 16, Target 0, LUN4, ?

and

rzg128c: BUS 16, Target 0, LUN5, ?

Also, (bonus points) how can you determine WWID for a disk with 4.0F from the UNIX level?

[Hein van den Heuvel]

The 'some-letter' were the luns.

For example on a an HSZ40 you would create a device DKA400, DKA401

The bus number came from teh actuall scsi bus, and thus would chance when you added/removed an interface, or used a differnt bus.

The 400 would be Unit 4, lun 0
That 401 woudl be Unit 4, lun 1

hth,
Hein.

[Hein van den Heuvel · Accepted solution]

Ah, now I see this is pretty much the same question as:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=969030

Similar question was dicussed a year before that in:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=476248


[going for the bonus points :-) ]

Would the wwid not be in one of the scsi mode pages tha t you can see with SCU, notably the "Device identification page."?
(http://home.comcast.net/~SCSIguy/SCSI_FAQ/RMiller_Tools/scu/scu.html)

Or maybe use the console software? P00>>> wwidmgr -show ...


Hein.

[Adam Garsha]

I disagree about the relevance of the first to links, they weren't on point. The last link may help, if it does, I'll pay-up.

[Vladimir Fabecic]

Addon:
If you have multilun devices then:
LUN 0 : no additional leter
LUN 1 : lettr a
LUN 2 : letter b
...
For example like Hein said.
Another example:
rza33 would be BUS 4 ID 1 LUN 1

[Adam Garsha]

scu> set nexus bus 5 target 1 lun 1
scu> show inquiry pages

Gives me the WWID. thanks.

[Adam Garsha]

Are you sure that LUN0 doesn't equal "a"?

[Martin Moore]

rza33 would be LUN 0, not LUN 1. "a" or no extra letter is LUN 0.

LUN 0 = rzaNN or rzNN
LUN 1 = rzbNN
LUN 2 = rzcNN
LUN 3 = rzdNN
LUN 4 = rzeNN
LUN 5 = rzfNN
LUN 6 = rzgNN
LUN 7 = rzhNN

where NN = (8 * SCSI Bus number) + SCSI target ID.

V4 was limited to a max target ID of 7 and a max LUN of 7.

Martin