On Tue, Oct 06, 2009 at 05:59:37PM +0000, Joseph L. Casale wrote: > >pvcreate is the first step of creating LVM areas. If you're not going > >to use LVM then you don't need to pvcreate. However I recommend > >that you _do_. > > Yea I guess I was rather vague. I do plan to carve up the md device w/ lvm > once it's up. Historically I run pvcreate on lvm partitions for various reasons. > > Should I create an pvm partition on the md0 device? I was not even sure I could... You don't run pvcreate on lvm partitions. You run pvcreate on the block devices that will be added to the volume groups. This puts the required headers on the device so that they can be identified by lvm. Now these block devices could be a hard disk partition, a complete raw hard disk (/dev/sda, for example)... or a raid metadisk (/dev/md0). Could even be a flash drive if you wanted. Doesn't matter. It's just a block device. As per my previous email, pvcreate /dev/md0 vgcreate MyVolumeGroup /dev/md0 lvcreate -L 1T MyVolumeGroup MyLVol1 lvcreate -L 1T MyVolumeGroup MyLVol2 lvcreate -L 1T MyVolumeGroup MyLVol3 would create 3 1Terabyte logical volumes which could be accessed as /dev/MyVolumeGroup/MyLVol1 etc etc. They're what you could run mke2fs on and mount. (commands off the top of my head, so might be slightly wrong!) -- rgds Stephen