[CentOS] Installing on partitionable RAID arrays
ssilva at sgvwater.com
Thu Mar 26 20:40:25 UTC 2009
on 3-26-2009 12:50 PM D Tucny spake the following:
> 2009/3/27 RedShift <redshift at pandora.be
> <mailto:redshift at pandora.be>>
> Mogens Kjaer wrote:
> > RedShift 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 it would make it easier for a single hot-spare to be available to several
arrays that were configured differently.
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