A PowerPath version change alone shouldn't change the disk device files, I've upgraded a number of times, and downgraded PP before without a change. Did something else change like what switch ports are in use, or what HBAs are being used?
Unless there are other reasons it is important you reuse the old device files, I would just use Lynn's suggestion with a twist. "If you haven't already vgexported the VGs" you can use the -s option, this will allow for discovery of the new paths because the mapfile will contain the VGID. When you do the vgimport, each device will be searched for this VGID.
- Create a mapfile for each VG.
# vgexport -p -v -s -m /vgXX.mapfile vgXX
- Check the mapfiles for consistency (not required but good practice).
The first line should contain the VGID, and there should be a subsequent line for each LVOL.
# more /vgXX.mapfile
VGID c2644d3e4501d78a (example)
1 lvol1
2 lvol2
- Export the volume groups.
# vgexport vgXX
- You have already done the ioscan and insf -e.
- Make the directory and special file.
# mkdir /dev/vgXX
# mknod /dev/vgXX/group c 64 0x0?0000
- Import the VGs, again using the -s option.
# vgimport -v -s -m /vgXX.mapfile vgXX
- Activate VG and mount LVs.
# vgchange -a y vgXX
# mount -a
This will get your VGs running with the new paths. There are other ways, but this is by far the easiest.
Jim
Hindsight is 20/20
