>Mark Lo wrote:
>
> > Hi,
> >
> > I have software raid 1 running on my system, how can i find out
> > whether the raid is working properly without shutting down my server.
> > As I know, If there is a raid error, the system will prompt at the
> > startup time. So , how to find out whether the raid is working fine
> > without reboot the server.
The software RAID subsystem will start logging to syslog and possibly the
console in the event of problems. You can also get some information from
the /proc filesystem:
# cat /proc/mdstat
Personalities : [raid1]
read_ahead 1024 sectors
md0 : active raid1 sdb1[1] sda10[0] 1024896 blocks [2/2] [UU]
unused devices: <none>
In this case, I have a raid1 filesystem, /dev/md0. It's active using
partitions sdb1 & sda10. The 2/2 indicates 2 out of 2 mirrors active and
I'm not sure what 'UU' means I *think* if one of the disks was bad or
being updated, one of the U's would be replaced with '_' but don't quote me
on that.
-Eric
Eric Sisler
Library Computer Technician
Westminster Public Library
Westminster, CO, USA
[EMAIL PROTECTED]
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