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Old 10-17-2013, 08:02 PM   #1
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Oracle Linux 5.8 Installation Mirroring Catch 22 - Help!

I need to install OL 5.8 (which is RHEL under the covers). Done it 100s of times before, but this time I want to mirror the installation across 2 brand new blank drives. Hardware RAID 1 is not an option, so it must be done with software.

During the installation, I get to the part of creating the Linux partitions, etc. Through trial and error, I have deduced the Make RAID Device screen (accessed by clicking the RAID button) will clone everything on a source drive to a target drive, thus creating a mirror. However, it will only do that IF the source drive contains 'software RAID' partitions ONLY. But it can't because the source drive HAS to have a boot (and swap) partition. Creating a software RAID partition of the entire drive 1 and then cloning it to drive 2 succeeds, but when you click Next, the installer says there is no boot partition defined and the installation cannot continue.

Thus, it seems it's a catch 22.

So, is it even possible to install Linux onto a (software) mirrored pair of drives?

I haven't been able to find any documentation to tell me how to do it and my research suggests trying to mirror the boot drive to another blank drive AFTER installation is a huge no-no.

Anyone help with this?

Old 10-17-2013, 08:57 PM   #2
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So, it seems it is possible after all, but the kicker is you have to install Linux onto a single drive first, then RAID 1 it with a second drive after the installation has completed.

I eventually found a 'How To' document on Oracle's support website. I didn't look there first because their support website is <insert your own expletive>.

For anyone who's interested and has access to My Oracle Support, here's the document ID:
How to Configure Oracle Enterprise Linux to be Highly Available Using RAID1 (Doc ID 759260.1)


I'll report back when I've had a chance to follow Oracle's procedure. I'm sure it'll be fine because their online documentation is always simple, straight forward and 100% error/bug free. Ahem. ;-)



clone, install, mirror, raid

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