[Gluster-users] 1/4 glusterfsd's runs amok; performance suffers;

Brian Candler B.Candler at pobox.com
Sat Aug 11 11:20:08 UTC 2012

On Sat, Aug 11, 2012 at 12:11:39PM +0100, Nux! wrote:
> On 10.08.2012 22:16, Harry Mangalam wrote:
> >pbs3:/dev/md127  8.2T  5.9T  2.3T  73% /bducgl  <---
> Harry,
> The name of that md device (127) indicated there may be something
> dodgy going on there. A device shouldn't be named 127 unless some
> problems occured. Are you sure your drives are OK?

I have systems with /dev/md127 all the time, and there's no problem. It
seems to number downwards from /dev/md127 - if I create md array on the same
system it is /dev/md126.

However, this does suggest that the nodes are not configured identically:
two are /dev/sda or /dev/sdb, which suggests either plain disk or hardware
RAID, while two are /dev/md0 or /dev/127, which is software RAID.

Although this could explain performance differences between the nodes, this
is transparent to gluster and doesn't explain why the files are unevenly
balanced - unless there is one huge file which happens to have been
allocated to this node.



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