Re: Logical Volume Manager and RAID
On 1/19/06, hendrik@topoi.pooq.com <hendrik@topoi.pooq.com> wrote:
> I'm planning to set up an array of two hard disks as a software RAID in
> and AMD64 box. TO have some flexibility, I'm also planning to use LVM.
> How does RAID interact with LVM? Do I place RAID on top of LVM or the
> other way around?
>
> Or am I worrying unnecessarily: Is it possible to mix them arbitrariy
> in multiple layers -- some LVM partitions on a RAID drive that's split
> as two LVM partitions on physical hard disks? ( I can't imagine
> why I'd want to do anything that convoluted, but if I knew it's that
> flexible I'll worry less about accidentally breaking something. :-)
>
> Also -- are the file system and partition formats identical no matter
> whether I run this Debian-only box with an AMD64 kernel or an i386
> kernel?
>
> -- hendrik
>
>
> --
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lvm should go on top of raid devices. as far as lvm is concered, the
raid devices are just block devices like harddrives.
but much of the code (device mapper) is the same between raid and
lvm2. So yeah, you should be able to do weird stuff with them.
file system formats are the same, no matter what they are running on,
otherwise it's no longer the same type of filesystem (ie., there would
be ext3-32 and ext3-64, and so on).
--
Noah Dain
"Single failures can occur for a variety of reasons that have nothing
to do with a hardware defect, such as cosmic radiation ..." - IBM
Thinkpad R40 maintenance manual, page 25
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