Move OS/Boot disks from one nPar/server to Another - Procedure and How to Reorder Bus instances

[Alzhy]

We've a requirement to move nPars/servers around as the need arises. Due to certain limitations of simply of re-igniting from backup (Net or Tape), we usually simply move the OS disks around (and just do the vg00 fix/lvlnboot stuff - which in itself sometimes offer some problems ..).

However our device instances are always incremented.. i.e. say on the old server my HBAs are td0 and td1, on the new environment, the HBAs will be seen as td2 and td3. The fix that I've always employed is to simply remove /etc/ioconfig and /stand/ioconfig - but I suspect this may not be the correct way and there must be another way.. which I am asking - how do you guys do it?

[A. Clay Stephenson · Accepted solution]

0) ioscan -f | grep -e "INTERFACE" \
-e "DEVICE" | grep -v -i "target" | \
awk '{printf("%-20.20s %-12.12s %3d\n, $3,$1,($2 + 0))}' | sort > /myfile

1) Use vi (or the text editor of choice) and change the "ext_bus" as needed/desired.



2) mv /stand/ioconfig /stand/ioconfig.SAV
mv /etc/ioconfig /etc/ioconfig.SAV
shutdown -ry 0

Because the ioconfig files are missing, you will get an ioinitrc prompt.

At the ioinitrc prompt type "/sbin/ioinit -c"
to rebuild the files.

3) Now apply your changes.

/sbin/ioinit -f /myfile -r

You can ignore warnings "Input is identical to kernel" but not errors "instance number 4 already exists for class"

The -r ioinit option causes the system to reboot immediately.

If you like this same procedure can also be used to reorder lan instances.

[Alzhy]

A. Clay - what if I do not do step 0? A number of times in the past - I do not do step 0 and the effect after 2 reboots is that all my device instances now start from 0 (lan and scsi/fc hbas..).

[A. Clay Stephenson]

Step 0 gives you the text file that you edit. If will list all the interfaces (SCSI and lan) as they currently are. You then edit it to reflect your desired changes.