Quote:
Do you think that it the best to have a mksysb of rootvg if I have a mirror on this box.
What do you do if the mirror fails, both disks die a horrible death or the place where your server stood, is empty on next morning?!
No mirror, complex raid array placed at different locations etc. could not convince me to take no mksysb. The mksysb is your last resort.
On paging space:
I don't know the official recommendation of the paging space today (RAM * 1,25?), but we usually have it somewhat small. On most boxes it's at least as large as the current RAM it has. When anything starts to swap, it doesn't matter if you have 4 GB paging space or 20 GB, because the box will be very slow and it has to be either tuned with vmo or needs more RAM, which has to be determined (or not).
For splitting paging space to SAN disks, I see no problem with this. We don't do that and keep it on internal mirrored disks, but currently I have no idea what should be bad about it... maybe a point of possible failure more.
But honour your mksysb!