topic Re: Reg SAN -switch port change in Operating System - HP-UX

Reg SAN -switch port change

chindi — Mon, 20 Jun 2011 09:29:07 GMT

Hi ,
we have a server rx4640 model with 8gb ram 11iv2..n only one fc card in it...
root #/ >ioscan -fnC fc
Class I H/W Path Driver S/W State H/W Type Description
=================================================================
fc 0 0/2/1/0 td CLAIMED INTERFACE HP Tachyon XL2 Fibre Channe
l Mass Storage Adapter
/dev/td0

which is connected to a san-switch 24 port...
we r havng a power downtime during which this san-switch would be powere off for 5 min...

now this san-switch is in cluster with another san-switch...also zoning has been done for this rx4640 server...in both switches..
cfg: TOP_SWITCH_CEDGE
zone: ATM_SERVER_EVA
50:00:1f:e1:50:09:61:28
50:06:0b:00:00:60:21:a8
50:00:1f:e1:50:09:61:2c
cfg: BOT_SWITCH_CEDGE
zone: ATM_SERVER_EVA
50:06:0b:00:00:60:21:a8
50:00:1f:e1:50:09:61:2d
50:00:1f:e1:50:09:61:29

my questn is at time of actvty can i shutdown d applcn n place the cable in another san-switch ( xyz port ) ...there wouldb be sme pyhsical path changes right ??
i will have to do vgimport when i change the san-switch for this particular rx4640 host ??

Re: Reg SAN -switch port change

Duncan Edmonstone — Mon, 20 Jun 2011 09:37:28 GMT

It's not where the server is plugged into the SAN that matters - it's where the disk array is plugged in.

If the disk array is being moved to a different SAN port or SAN switch, or the switch domain ID is changing then the hardware paths and device files will change and you will need to vgexport/vgimport.

If its just the server thats moving to a different SAN port, you should be fine to unmount the filesystems/deactivate the VG, move the server then re-activate/re-mount.

HTH

Duncan

Re: Reg SAN -switch port change

chindi — Mon, 20 Jun 2011 09:50:21 GMT

Hi Duncan
you mean i just have to ;

1] shutdowm my applicn
2] vgexport -p -v map file
3] vgchange -a n vg
4] power off the switch 1
5] change d port f rom switch 1 to any switch 2
6] vgchange -a y vg
7] mount lvol

is it fine ?????

Re: Reg SAN -switch port change

Duncan Edmonstone — Mon, 20 Jun 2011 10:06:54 GMT

Yes, lookd good to me - chucking in the "-s" option on the vgexport will likely make the vgimport more straightforward as well, as you will get the VGID of the volume group also written to the map file...

HTH

Duncan

Re: Reg SAN -switch port change

chindi — Mon, 20 Jun 2011 10:21:08 GMT

Hmm thnx for the -s option Duncan.