rootvg mirrored

I want to increase the size of /tmp by 1GB
I know that the command is
chfs -a size=+1G /tmp
But the rootvg is mirrored and when I do a lsvg -p rootvg, I could see 2 disks.
Will there be any impact if I increase the size of /tmp when the rootvg is mirrored ?
Please advise.

This will work perfectly - actually this is the point of having a Logical Volume Manager! it is the software which takes care of these details.

I hope this helps.

bakunin