Adding SAN switch

[Lawrence Kaufman]

Hello. I have my server attached to (2) VA disk arrays via (4) HBAs. Each VA controller is attached to its own HBA. I want to install a SAN switch between the HBAs and VAs. My question is: Are the device IDs going to change for all of the LUNs assigned? I am assuming they are. Am I going to need to vgexport and vgimport? Thanks!

[Patrick Wallek · Accepted solution]

>>My question is: Are the device IDs going to change for all of the LUNs assigned?

YES

>>Am I going to need to vgexport and vgimport?

YES

When doing the vgexport/vgimport be sure to use the '-s' switch to insert the VGID into the map file.

Say your VG is VG01:

# vgexport -m /var/tmp/vg01.map -p -v -s vg01

When you vgimport

# vgimport -m /var/tmp/vg01.map -v -s vg01

The '-s' switch will search for disks matching the VGID in the vg01.map file so you don't have to manually specify the disk devices on the vgimport command line.

[Lawrence Kaufman]

Thanks!

[Eric SAUBIGNAC]

Bonsoir Lawrence,


When you work with SAN switch, HP-UX hardware path take care of the ID of the switch and the number of the port on wich the storage is connected. Unless you are working with HP-UX 11iv3, the special disks file names will do change

So you will have do export/import the VG ... sorry !

Just a precision. You said "I want to install a SAN switch between the HBAs and VAs." Nice. But, just one switch ? If yes be aware that the switch will become a SPOF. You should at least add 2 switch.

Hope this will help

Regards

Eric