Re: iostat with raid device...

[Robin Hill <robin@robinhill.me.uk>]

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On Mon Apr 11, 2011 at 01:32:34 -0700, Linux Raid Study wrote:
> On Sat, Apr 9, 2011 at 1:50 AM, Robin Hill <robin@robinhill.me.uk> wrote:
> > On Fri Apr 08, 2011 at 05:40:46PM -0700, Linux Raid Study wrote:
> >
> >> What I'm not sure of is if the device is newly formatted, would raid
> >> recovery happen? What else could explain difference in the first run
> >> of IO benchmark?
> >>
> > When an array is first created, it's created in a degraded state - this
> > is the simplest way to make it available to the user instantly. The
> > final drive(s) are then automatically rebuilt, calculating the
> > parity/data information as normal for recovering a drive.
> >
> Thanks. So, the uneven (unequal) distribution of Wrtie/Sec numbers in
> the iostat output are ok...is that correct?
> 
If it hadn't completed the initial recovery, yes.  If it _had_ completed
the initial recovery then I'd expect writes to be balanced (barring
any differences in hardware).

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@robinhill.me.uk> |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |

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