kj wrote:
ghe wrote:
I've partitioned a server disk fairly heavily, and I want to RAID1 it.
I see on the 'Net that there's such a thing as "partitionable RAID
arrays". But I also read that this isn't such a good idea. Seems
pretty good to me: build an array of unpartitioned drives, and slice
it up. Is there really a downside to this?
Well, you need to distinguish between software raid and hardware raid.
With hardware raid, that's what you'll get - one big /dev/sdX device
that you can partition to your heart's content.
With software raid, you build your raid from partitions (type fd). If
you want the one-big-disc approach, make a /boot and then the rest of
each disc as one big partition. Raid the big partitions and stick LVM
on top. This allows you to slice up the big raided space and deal with
only one raid device. As a bonus, it allows you to resize filesystems
that would otherwise be limited by a fixed partition size.
--kj
I use a partitionable mdadm array. Before that I tried to just make
one big array and then chop it up with LVM but I noticed a big
performance hit in bonnie++
Sam
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