[ubuntu-uk] Ubuntu RAID Management

[Andy Smith]

Hi Chris,

On Fri, Aug 22, 2008 at 09:18:53PM +0100, Chris Rowson wrote:
> I'm configuring a server with software RAID and wondered if any of you
> have any ideas about monitoring the RAID array. Does anyone have any
> ideas about suitable applications for monitoring software RAID status
> under Ubuntu?

As others have said, mdadm comes configured to monitor the arrays as
long as you actually have mdadm running as a daemon after boot.  It
will email you and log to syslog.  If you need more, you can
configure it to run specific programs when it gets different events
(array failure, rebuilt, spare available etc.).

By default it also does an array consistency check on the first
Sunday of every month.  This is advisable and you may even want to
alter it to be weekly.  The reason for that is that corruption can
be introduced into a disk and then never found, since data reads may
come from the other disks.  The corruption would then only get found
when a disk dies and the array is rebuilt from the other members,
possibly introducing a double disk failure and loss of some or all
data.

Finally, if you have your own monitoring system, you can make it
look at /proc/mdstat to see what the current status is.

Cheers,
Andy

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