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

["V. Peter Stulginskis" <vps@xxxxxxxxxxxxxx>]

James,

Mirroring rarely works the way you hope it would.  If you want to implement
a level of RAID go to RAID-5 with hot-swappable drives.  It's a much better
use of resources and has a greater potential for recovery.  Personally and
depending on your requirements, with the cost of complete systems dropping I
recommend to use the money you were planning to spend on RAID implementation
an install a complete redundant second system.  You may have to load some
software in the event of your primary system going down, but as long as
you've maintained some decent backups the confidence and time of recovery is
much better.

Pete Stulginskis

-----Original Message-----
From: cobalt-users-admin@xxxxxxxxxxxxxxx
[mailto:cobalt-users-admin@xxxxxxxxxxxxxxx]On Behalf Of H.P. Stroebel
Sent: Wednesday, May 24, 2000 6:19 AM
To: cobalt-users@xxxxxxxxxxxxxxx
Subject: Re: [cobalt-users] Second drive in RaQ3i - Mirror




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 :-)


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