aix fc switch connection problem

[raziel99]

Hi there !
this is what i have:

server: p650 6M2
os: aix 5.2 ml1
fc adapter: 2 adapters - IBM 6239 with Firmware version 1.81X1
fc switch: migrating from mcdata-ds24m2 to cisco mds9140. one adapter
connected to the mcdata, and one connected to the new cisco mds9140

my problem: the fc adapter does not connect properly to the cisco
mds9140 switch. there is a link, but the switch gui interface shows
link failure. when i examined the fc-scsi-protocol characteristics i
noticed a difference between the 2 adapters:

the command I issued: "lsattr -EHl fscsi0 (or fscsi1)"
the adapter that is connected to the old mcdata switch, and is working
properly has the property "attach=switch" and the adapter that is
connected to the new cisco switch and has a problem has the property
"attach=al". this property is NOT user-settable, so i don't know what
to do in order to change this value.

i also tried to change the admin mode of the port in the switch - to
fix it as an F port, and fix it to 2gb speed, but that didn't help.

is there anything else you can advise?
thanks,
yaron

[Hajo Ehlers]

Check and compare with
$ lsattr -EHl fcs0
$ lsattr -EHl fcs1
the fc-hba settings.

If you get no link on the fc-hba attached to your cisco you might have
to cross the cable on one end. Its pretty easy to build and attach the
cable the "wrong way"
Example:
wrong:
hba switch cisco
TX RX TX TX
RX TX RX RX

correct:
hba switch cisco
TX -> RX TX -> RX
RX -> TX RX -> TX

hth
Hajo

[Dmitri Pasyutin]

On Tuesday 06 December 2005 16:40, raziel99 wrote:

> the command I issued: "lsattr -EHl fscsi0 (or fscsi1)"
> the adapter that is connected to the old mcdata switch, and is
> working properly has the property "attach=switch" and the
> adapter that is connected to the new cisco switch and has a
> problem has the property "attach=al". this property is NOT
> user-settable, so i don't know what to do in order to change
> this value.

Try deleting the adapter and reconfiguring it (assuming it is
fcs1):

rmdev -Rdl fcs1
cfgmgr

The fscsi1 device should come up with 'attach=switch' if the
Cisco switch is in a SAN fabric.

If this adapter was never connected before, there is a good
chance that the initial value of 'attach' will be 'al', since
new adapters usually come with plugs that emulate a loop. As
you said, you cannot change this value on the fly, only by
reconfiguring the device.

Dmitri