Re: Raid 10 Problems?

[dean gaudet]

On Mon, 5 Mar 2007, Marc Perkel wrote:

> 
> --- Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx> wrote:
> 
> > 
> > On Mar 4 2007 19:37, Marc Perkel wrote:
> > >> 
> > >>   -b internal -- seems like a good idea to speed
> > up
> > >>   resynchronization.
> > >
> > >I'm trying to figure out what the default is. 
> > 
> > -b none, meaning the whole drive will be
> > resynchronized when the
> > even counters don't match.
> > 
> >
> http://gentoo-wiki.com/HOWTO_Install_on_Software_RAID#Write-intent_bitmap
> > 
> > 
> 
> That information has been extremely useful. Thanks a
> lot. I fund a command to do the bitmap internal after
> the array was made so I added that. Seems like some of
> these features should be default. Maybe it's time for
> the raid folks to update what is default?

the bitmap has performance implications... for example:

http://www.mail-archive.com/linux-raid@xxxxxxxxxxxxxxx/msg07229.html

i still prefer to use the bitmap -- i just make it external for devices 
which are busy.

note that unless you tweak your init scripts you'll need to put external 
bitmaps on your root partition, see this thread:

http://www.mail-archive.com/linux-raid@xxxxxxxxxxxxxxx/msg06441.html

-dean
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