On Thu, Oct 28, 1999 at 02:18:32PM +0200, Thomas Waldmann wrote:
...
>
> > I can understand the write performance but I would think the read
> > performance would be better given that it should be reading from both
> > halves of the mirror?
>
> It was NOT better here, too. I also wondered about that because the docs say
> sth different.
This should be clarified in the docs alright...
If you run two bonnies you will see that your read performance gets better
(well the sum of the read performance will be superior to that of one disk).
RAID-1 will distribute reads to the two disks, but it's not a gain if you
only read one consecutive piece of data. If the two disks should share the
reading, they should seek all the time (disk A should skip the blocks disk B
just read). That doesn't improve read performance.
However, if concurrent reads take place, you will see a performance gain from
the read distribution.
> > Basically looking for the MAXimum performance out of this thing.
>
> RAID-0 is better ;-) But far less fail safe (not at all failsafe ;-).
Absolutely. If you want MAXimum performance and don't care too much about the
data, go with RAID-0.
Remember, an N disk RAID-0 is N times more prone to failure than one single
drive. This gets ugly when you have many disks, especially because you'll
likely loose the entire filesystem if a disk goes down.
--
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