How to select primary (perfomance) path

[Igor I. Shulz]

I have VA7410 array which is connected thru two hw-pathes:

fc 0 0/0/8/0/0 td CLAIMED INTERFACE HP Tachyon XL2 Fibre Channel Mass Storage Adapter
/dev/td0
fcp 0 0/0/8/0/0.8 fcp CLAIMED INTERFACE FCP Protocol Adapter
ext_bus 9 0/0/8/0/0.8.0.108.0 fcparray CLAIMED INTERFACE FCP Array Interface
target 7 0/0/8/0/0.8.0.108.0.0 tgt CLAIMED DEVICE
disk 63 0/0/8/0/0.8.0.108.0.0.0 sdisk CLAIMED DEVICE HP A6218A
/dev/dsk/c9t0d0 /dev/rdsk/c9t0d0
disk 65 0/0/8/0/0.8.0.108.0.0.1 sdisk CLAIMED DEVICE HP A6218A
/dev/dsk/c9t0d1 /dev/rdsk/c9t0d1
disk 67 0/0/8/0/0.8.0.108.0.0.2 sdisk CLAIMED DEVICE HP A6218A
/dev/dsk/c9t0d2 /dev/rdsk/c9t0d2


and

fc 1 0/0/10/0/0 td CLAIMED INTERFACE HP Tachyon XL2 Fibre Channel Mass Storage Adapter
/dev/td1
fcp 1 0/0/10/0/0.8 fcp CLAIMED INTERFACE FCP Protocol Adapter
ext_bus 8 0/0/10/0/0.8.0.110.0 fcparray CLAIMED INTERFACE FCP Array Interface
target 12 0/0/10/0/0.8.0.110.0.0 tgt CLAIMED DEVICE
disk 55 0/0/10/0/0.8.0.110.0.0.0 sdisk CLAIMED DEVICE HP A6218A
/dev/dsk/c8t0d0 /dev/rdsk/c8t0d0
disk 56 0/0/10/0/0.8.0.110.0.0.1 sdisk CLAIMED DEVICE HP A6218A
/dev/dsk/c8t0d1 /dev/rdsk/c8t0d1
disk 57 0/0/10/0/0.8.0.110.0.0.2 sdisk CLAIMED DEVICE HP A6218A
/dev/dsk/c8t0d2 /dev/rdsk/c8t0d2


During creation of VGs - how should I set primary link? Fox example, which link shoud be concidered as perfomance one: /dev/dsk/c9t0d0 or /dev/dsk/c8t0d0 ?

[Paul_481]

Hi,

The first device that you assign to your volume group will be you primary path. The second of path of course would be the secondary.

You can use the "vgreduce vg?? /dev/dsk/c9t0d0"

Then add it again "vgextend vg?? /dev/dsk/c9t0d0"

Once you vgreduce /dev/dsk/c9t0d0, /dev/dsk/c8t0d0 will automatically be the primary path.

Regards,
Paul

[Ravi_8]

/dev/dsk/c9t0d0

[Igor I. Shulz]

My ulgy and poor English....

I know HOW TO SET PRIMARY LINK, but how can I discover which link is really perfomance one? OK, I've got answer from HP support (RG1 -> Controller 1 of VA7410. So task is to determine which Tachion is connected to Controller 1 and which one is connected to Controller 2), so thread is closed.

Anyway thanx to all !!!

[Florian Heigl (new acc)]

Igor, You can use
/opt/fcms/bin/fcmsutil /dev/tdN get remote all
to find out which hba is connected to which port of Your storage system.