Bug#510641: Bug #510641: mdadm: checkarray emits messages for auto-read-only md devices

[Adam D. Barratt]

Philipp Kern wrote, Sunday, January 04, 2009 12:14 AM
> I just got alerted by mdadm with this:
> /usr/share/mdadm/checkarray: line 167: echo: write
> error: Device or resource busy

We've had the same issue for the past couple of monthly checks. I hadn't 
reported it as everything seemed to be working and no-one else seemed to be 
experiencing it.

> Actually it tried to write to /sys/block/md0/md/sync_action
> and it seems that md0 does not like that.  It works fine with
> md1 and md2.  The mdstat is as follows:
[...]
> The md devices were created by a setup script and md0
> holds the swap space which is, I think, the rationale for
> using auto-read-only.

Our setup's similar. The arrays were created by lenny d-i (RC1) and the swap 
array (md1) is marked as auto-read-only.

Aside from the slightly worrying error message (at least at first glance), 
the arrays after the swap never actually get checked, as the failure causes 
the script to exit.

Adam