How does LVM decide which Physical Volume to write data to?
I am moving data from a single drive to a new volume group called "3ware" (helps me remember which controller the drives are attached to!).
The steps I took are as follows:
1. Created a PV made of /dev/md3 (two 750GB drives in RAID1).
2. Created a PV made of /dev/md9 (two 500GB drives in RAID1).
3. Added the 750GB then the 500GB physical volumes to the new volume group (in that order).
Now when I started moving data onto the new group I can see with iostat that the data is being put onto md9. So what determines which physical volumes get the data?