Configure speed of checkarray in mdadm?

Configure speed of checkarray in mdadm?

[David Vuorio]

Hi,

I'm a happy user of mdadm 2.6.7.1 (2.6.7.1-1ubuntu8) and would like to
make a request.

When my monthly RAID check is triggered (I have two SATA disks in a
RAID1 setup) it consumes a significant amount of resources, essentially
freezing the system for the most part.

While I might cancel or reschedule these checks as needed, I would
prefer if the bandwidth usage could be configured manually, or even
adjusted dynamically. Alternatively, is there already a way to minimize
the impact beforehand?

Thanks a lot for your help.

Kind regards,
David Vuorio

Re: Configure speed of checkarray in mdadm?

[Thomas Backlund]

David Vuorio skrev:
> Hi,
> 
> I'm a happy user of mdadm 2.6.7.1 (2.6.7.1-1ubuntu8) and would like to
> make a request.
> 
> When my monthly RAID check is triggered (I have two SATA disks in a
> RAID1 setup) it consumes a significant amount of resources, essentially
> freezing the system for the most part.
> 
> While I might cancel or reschedule these checks as needed, I would
> prefer if the bandwidth usage could be configured manually, or even
> adjusted dynamically. Alternatively, is there already a way to minimize
> the impact beforehand?
> 
> Thanks a lot for your help.
> 

Change value of /sys/block/mdX/md/sync_speed_max ?

--
Thomas

Re: Configure speed of checkarray in mdadm?

[David Vuorio]

David Vuorio wrote:
> When my monthly RAID check is triggered (I have two SATA disks in a
> RAID1 setup) it consumes a significant amount of resources, essentially
> freezing the system for the most part.

Hmm,

I had missed some vital parts of the md man page for some reason, and
apparently wasn't persistent enough in Googling either...

Well, /proc/sys/dev/raid/speed_limit_{min,max} should be enough for my
purposes. Problem solved, I guess.

Kind regards,

/David