D Tucny wrote:
>
> > ...
> >> Not only do you
> >> have to execute 4 times as much commands, reconstruction of the 4
> >> arrays will take place in parallel leading to slow disk access
> during
> >> reconstruction.
> >
> > Is this right?
> >
> > When I have replaced a disk and added several partitions
> > to an array, the rebuild is done one partition at a time.
> >
> > The /proc/mdstat would say "delayed" on the partitiones
> > waiting.
> >
> > Mogens
>
> I must be mistaken then, it's been a long time since I've used
> regular md devices.
>
>
> I can confirm this and furthermore, the default sync max transfer rate
> is very low for modern disks, so unless you've increased it to speed up
> sync or you have a very heavy disk workload, it's probably not going to
> impact normal disk access that much...
>
> That said... I'd much prefer partitionable arrays from a management
> point of view... It's how all the hardware solutions work and they can't
> all be wrong ;)
And if someone is thinking of changing things, what would really be nice
would be a default install on a single disk where you could add the
mirror disk later and sync it in. Is that possible?
--
Les Mikesell
lesmikesell at gmail.com