I'm completely new to linux admin and file system. Recently we acquired an HP MSA P2000 san. I've setup the disk into a vdisk and created 3 volumes on it. On Centos 7, I've also setup the multipath mapper and have those volumes mapped into /dev/mapper/mpatha, mpathb and mpathc.
I saw on a couple of web site that they do the following: (whichever is the underlying disk of e.g. mpatha)
# fdisk /dev/sdd # kpartx -a /dev/mapper/mpatha # mkfs.ext3 /dev/mapper/mpathap1
to format the disk. Redhat DM multipath document recommend
# pvcreate /dev/mapper/mpatha
to create an LVM volume.
My question is
- For the former, when the volume is expanded later, do I need to backup and fdisk, mkfs the entire /dev/sdd again?
- For the latter, it seems like vdisk and volume creation is already managed by the HP P2000 disk management tool, it seems I don't really need to further create partitions/volumes on top of it. Should I probably not LVM here, no?
- What's the right thing to do? do I really need to 'format' and initialize a further partition?