[CentOS] Installing on partitionable RAID arrays
Philip.R.Schaffner at NASA.gov
Thu Mar 26 13:16:44 UTC 2009
> RedShift wrote:
>> Since linux 2.6, the md layer has a feature called partitionable
>> arrays. So instead of having two disks, creating an identical
>> partition table on both and then putting those partitions in RAID 1,
>> you take those two disks and put them in one partitionable RAID 1
>> array (in mdadm terms, "mdp") and create a partition table on the new
>> RAID device. The advantages are quite clear compared to the old
>> non-partitionable arrays.
>> My question is, is this supported by CentOS? The GTK installer doesn't
>> provide a way to create such an mdp device and the integrated
>> partitioning tool does not see for example md_d0 when I create it
>> manually from the console.
I expect we may have to wait on upstream to have installer support.
Anybody with RHEL want to put in an official request?
>> Another way to get CentOS on such a configuration would be to do
>> everything manually, thus installing the base system by creating the
>> necessary disk allocations and then rpm -i all the required packages
>> to get it to boot. (I've done this before, it's not a big deal, you
>> just need to follow a certain order - I remember documenting it
>> somewhere but forgot). But since this method is probably not
>> officially documented anywhere or even supported I'll most likely
>> won't get any support if this setup were to fail somehow (like when
>> upgrading between minor versions).
>> I've tried STFW'ing, but searching for centos and partitionable arrays
>> is too ambiguous.
I tried googling too, and came up with lots of docs on "partitionable
arrays", but nothing on installing. Can't say for sure without testing,
but I suspect GRUB would choke on this. Would probably still need at
least a /boot on a separate partition, or a standard RAID1.
>> Best regards,
>> Glenn Matthys
> As a follow-up, I found the documentation I wrote how to install CentOS
> without any installer:
> # First, setup your disks to your liking. You can use whatever you want
... snip ...
> (PS: I've also attached the documentation as install_centos.txt, but
> mailman will probably strip it)
Attachment came through fine for me. Very interesting - might make a
nice Wiki article, and could be included on a LiveCD as a way of
bootstrapping a CentOS install.
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