Hi everyone.
This isn't specifically a CentOS question, since it could apply for
any distro but I hope someone can answer it anyway.
I took the following steps but was puzzled by the outcome of the test
at the end:
1. Create a RAID1 array called md3 with two 750GB drives
2. Create a RAID1 array called md9 with two 500GB drives
3. Initialise md3 then md9 as physical volumes (pvcreate)
4. Create a new volume group called "3ware" with md3 (helps me
remember what controller the disks are on)
5. Use vgextend and add md9 to the 3ware volume group.
6. Add a logical volume filling the volume group then create a ext3
filesystem on the entire volume.
Now I started moving a lot of data onto the volume and iostat said all
the data was being written to md9. Why that array? How does it decide
which physical volume to write to?
I could not find any documentation or information online about how
exactly this works.
Thanks!
Oliver
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