HIghest instance number

[kw_1]

We have large amount of disks on our HP-UX 11i systems. Because we are troubleshooting/re-configuring disk assignments, we are re-ioscanning over and over many times. Does anyone knows what is the highest instance number it can be and what will happen if that limit is exceeded?

[Steve Steel]

Hi



For more information, see man "insf(1M), lssf(1M), mksf(1M), rmsf(1M)" ,Your O/S release Notes and the "Configuring
HP-UX for Peripherals" manual.


www.docs.hp.com


Steve Steel

[Sachin Patel]

I don't know the highest number but we have instance number upto 110 in one of our server.

Sachin

[Dietmar Konermann]

See page 2 of:
http://www.docs.hp.com/hpux/onlinedocs/netcom/maxlun-whitepaper-v1.0.pdf

Best regards...
Dietmar.

[Bill McNAMARA_1]

depends on the hardware configuration more than software. Under FC you can get in the order of 16Million theoretically addressed or something crazy like that, but in reality it's what you're busses support.

cXtYdZ
c 7bits = lots of ext_bus'es
t 4 bits = 16 targets
d 3 bits = 8 luns
for SCSI busses.
(FC targets overflow >4bit t fields into the c field)

Later,
Bill

[Lorenzo Facello]

Hi,
Have you try to launch:
insf -e
to reinstall all the device file.
Take a look also at the man pages to find other options.

L.

[Bill Hassell]

As you delete disks or LUNs, be sure to use rmsf to remove the device files (not rm /dev/dsk..whatever...) as this will remove the instance from the kernel and allow that instance to be reused.

Alternatively, you can specify a given (unused) instance number using insf -I

Hint for systems with a lot of devices: ioscan -k will always give instant response without polling every device on the system. The only time you'll need to drop the -k is when you add devices while the system is running (which is a bit risky anyways).

[kw_1]

I apologize for not being more specific with my question. By instance number, I meant the second column of the output from "ioscan -f". Our current highest number is 267 so I assuming we're safe to at least 512. Unless there is a limitation problem, we probably won't take any steps to re-assign any numbers.