These corresponds to /dev/sdb and /dev/sdd devices. I've checked them (same LUN, just different path using SANsurfer from Qlogic)
We have one VG using one of the PVs: --- Physical volumes --- PV Name /dev/sdb1 PV UUID zytcmV-fa9l-tsKi-FVCF-2MXV-ektu-r7t2a1 PV Status allocatable Total PE / Free PE 52097 / 1
The problem is that we can't add the second PVLink, as we normally do in HPUX, to the VG: [root@svl06 ~]# vgextend vg02 /dev/sdd1 /dev/sdd1 not identified as an existing physical volume Unable to add physical volume '/dev/sdd1' to volume group 'vg02'.
pvlinks is an HP-UX thing. These days the two standard methods for doing it on Linux with qlogic cards are the qlogic driver's built-in failover and the dm-multipath generic multipath driver. I think qlogic and the Linux distributions are pushing toward dm-multipath as the standard solution, but qlogic failover has been around longer (Red Hat only added dm-multipath in RHEL4u2).
You'd probably want PowerPath if you had an EMC. You can also use qlogic's SanSurfer for some additional load balancing options with the qlogic driver. HP's SecurePath, however, was pretty much a dead product the last time I looked - HP had no plans to support 2.6 kernels and said to use the qlogic failover driver (they had an HP-certified package).
