On Sat, 2007-03-31 at 22:14 -0700, John R Pierce wrote:
Cen Tos wrote:
I've been reading the RHEL 5 manual/guide linked from centos, and the idea of LVM with expandable partitions seems like a great idea (yes duh why else would it exist if not?). Although the documentation shows a screenshot of how the final setup would look like with LVM & RAID together, it doesn't actually gives the step.
- Am I correct in thinking it should be done in this way
- setup Softraid
- setup LVM on the raid partitions
Secondly, LVM allows expansion of the LVM group when we add a new drive. But with softraid, how will this happen? Searching around does not turn up any guide on this. Am I correct in thinking I must always add new drives in pairs (for Raid 1), create a new softraid partition then assign this new partition to the LVM group?
yup, pretty much thats how it works.
In IBM AIX (where LVM kinda came from), the soft raid and volume management is rather tightly integrated, but in linux, its seperate.
I guess you've got the gist of the matter right - setup software raid - setup LVM on the software raid paritions
and if you need to increase space thereafter - add in the physical drives - setup new software raid - add these /dev/mdX into LVM (pvcreate, vgextend etc.)