Re: resync hangs

[Randall Smith <randall@tnr.cc>]

NeilBrown wrote:
>>
>> ~$ grep . /sys/block/md2/md/*
> ...
>> /sys/block/md2/md/sync_speed:0
>> /sys/block/md2/md/sync_speed_max:0 (system)
>> /sys/block/md2/md/sync_speed_min:0 (system)
> 
> This looks like the culprit.  The sync_speed has been limited to
> 0.  The "(system)" means that it is using the value from
>   /proc/sys/dev/raid/speed_limit_max
> 
> It seem that that value has been set to 0 somehow.
> The default value is 200000.
> 
> Could something be setting that?  Can you set it back?
>  .../speed_limit_min should be 1000 by default.
> 
> NeilBrown

I'll set it back next time it happens.  Any guess what might set that 
value to 0 and why? mdadm is the only thing I know of that knows about 
raid.  It starts up late in the init process with this command:

/sbin/mdadm --monitor --pid-file /var/run/mdadm/monitor.pid --daemonise 
--scan --syslog

Thanks for your help.

Randall