bus instance limit for storage devices

[cgshaju]

Does any one knows the ext_bus limit for hpux 11i for emc disk devices.

The error i get in dmesg is below.the host is a rp8400 connected to emc dmx through 8HBAs.

"wsio_claim init failed isc=0x124b34c00 name=fcpdev
fcpdev_init unsuccessful. Bus Instance number 264 exceeded the maximum allowed (255)."

i need to add devices but my bus has already reached address 243.

[Steve Steel]

Hi

It will be as shown 255

Thats 8 bits or switches to set it


Steve STeel

[Dietmar Konermann]

The limitation is indeed 255, but the boundary check has been added by patches after initial release of 11.11 to avoid memory corruption. This explains why your config seems to have already reached 265 in the past.

I assume that not all instance numbers are currently in use on your system. Check for it:

# ioscan -kCext_bus | grep ext_bus | wc -l

If the result is less than 255 then your ext_bus slots are occupied by old entries reflecting former EMC/HW/SAN configurations. By design these are not automatically re-used by the kernel.

To workaround this is not an straight-forward task. You could e.g. prepare an infile for ioinit(1M), move /etc/ioconfig and /stand/ioconfig away and reboot... the system would stop booting at the ioinitrc stage. From here you could re-create a new (and clean) ioconfig and apply the prepared infile to it using ioinit(1M).

If in doubt, I would strongly recommend to open a call with your response center for assistance.

Best regards...
Dietmar.

[Alzhy]

Am having the same problem on my biggest nPar on a SuperDome. The SAN is composed of 4 EVA5000 units and 2 MSA's..

[Ashwani Kashyap]

hope this link helps :
http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000072805488

Document ID : KBRC00013394