Resetting Fiber connection

[Larry Scheetz]

I have a N4000 (11.0)with duel fiber connection to separate brocade switches. One of the switches went out this weekend which dropped that fiber link. Now that the switch is back up when doing an ioscan I am seeing NO_HW. Our Windows servers had to be rebooted to synch the connection backup. This is a production box and cant reboot. Is there anyway to re-synch this connection? I have done a ioscan -fn but it shows it as NO_HW.
Thanks Larry

[Karthik S S]

Try doing a "insf -e" may be the device instances have changed.

Run the the following commands and observe them carefully,

ioscan -fnC fc
fcmsutil /dev/td0
fcmsutil /dev/td1
ioscan -fnC disk

Regards,
Karthik S S

[Mark Grant]

You'd normally do this kind of thing using "fcmsutil" but as that takes a device name you are not going to have much luck if ioscan can't see it.

I suspect that there is something else wrong here. ioscan should see the card even if you don't have it connected to a switch.

[Steven E. Protter]

insf -e is needed to get any disks assigned while the machine is running to be recognized.

There are limits to what 11.00 can do without a reboot, which does run ioscan(definitely) and insf -e(probably) at boot time.

SEP

[Florian Heigl (new acc)]

check in mstm's logtool and fcmsutil *if* your system has succesfully reconnected to the brocade (F_LOGIN)

Try if a dd from a SAN LUNs raw device actually works.

If You happen to find problems with that, stop Your applications and take the fc adapter off- on online.

fcmsutil /dev/fcNUM (dis|en)able

ioscan -fnCdisk afterwards

Also check fcmsutil actually sees the partner WWNs it should.

If that doesn't help, You're probably out of luck and it's time for a reboot.

Regards,
Florian

[Hazem Mahmoud_3]

Try resetting the card using lanadmin.
# lanadmin
Then choose "lan"
Then choose the correct ppa # for the card (you can get the ppa # from "ioscan -funC lan" and looking at the "I" column (for instance #)
Then choose "reset"

I reset our gigabit card in times like this and it seemed to bring it back to life.

-Hazem

[Kirby A. Joss]

Two more possibilies...

1. The Brocade fabric id shows up as part of the HW path in ioscan. Make sure that the FC switch had this configured to match the one it replaced, or it your old dev will all be NO_HW and new devices will be created which you must then vgextend.

2. The Tachyon cards "remember" the N-Port ID to which they were connected, (Item 1 impact) and may refuse to connect to another (HP security feature). Check your syslog for instructions. I have seen things like "run fcsmutil replace_disk" in there. When I did whatever it said, it has worked for me.