On 05/23/2012 03:07 PM, Les Mikesell expounded in part:
I thought these days you could raid the whole disk and put partitions
on the raid, although I've never done it that way. I have 2 complaints
about MD. One is that it doesn't handle errors/retries on members very
well - it will kick members that are perfectly fine running standalone
or as the last remaining member, and the other is that partitions over
2TB need a new format that the kernel doesn't auto-detect. Much of the
reason I liked MD in the first place was its ability to assemble
things correctly at boot regardless of the drive's physical attachment
or location.
You can raid the whole disk. But having smaller partitions makes it
easier to distribute them over odd numbers of disks. Back when I ran
AIX, you could add a disk of any size to the VG, and mirrored LVs would
allocate LPs from physically separate PPs. You never had to worry
about matching disk sizes. With MD, you can also add odd disk sizes and
fully use them, but you have to do it manually, and more solutions are
available with smaller partitions. (But having too many is too tedious.)
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