Re: [cobalt-users] Second drive in RaQ3i - Mirror

["H.P. Stroebel" <hpstr@xxxxxxxxxxxxx>]

James schrieb:

> extremely useful if I could put a second hard drive in and use it to
> make an exact mirror of the first drive.

> Has anyone implemented such a solution?

i have my rack backing up via the second network port (internal network)
to another machine, that runs with two hard disks and the linux
raid-level tools (mirroring) on debian 2.2.

setup was rather complicated and i am not very convinced that it would
help much. booting from the second disk is not as simple as i thought,
as the root partition doesn`t like to boot from a md (=software raid)
device.
if the server crashes and reboots, it goes into single user mode because
the md devices have not been unmounted; you have to check and clean them
manually (have not tried this using a script).
i will throw out this solution because it doesn`t seem much reliable (i
am not sure if i installed all right); in my opinion it is better to buy
a hardware solution (not for a raq, though...).

there are two howtos concerning this : the raid-level howto and the
linux root-raid-howto; redhat 6.2 - at least i think - contains improved
support for software raid-level-devices, but i haven`t figured out what
it could be...

good luck :-)