Thomas Davis wrote:
> JMy 4way IDE based, 2 channels (ie, master/slave, master/slave) built
> using IBM 16gb Ultra33 drives in RAID0 are capable of about 25mb/sec
> across the raid.
nice to hear :-) not a very big performance degradation
>
>
> Adding a Promise 66 card, changing to all masters, got the numbers up
> into the 30's range (I don't have them at the moment.. hmm..)
>
> > I was also wondering about the reliability of using slaves.
> > Does anyone know about the likelihood of a single failed drive
> > bringing down the whole master/slave pair? Since I have tended to
> > stay away from slaves, for performance reasons, I don't know
> > how they influence reliability. Maybe it's ok.
> >
>
> When the slave fail, the master goes down.
>
> My experience has been, when _ANY_ IDE drive fails, it takes down the
> whole channel. Master or slave. The kernel just gives fits..
hmm .. strange .. I got an old Pentium box, and disconnected the slave and
the raid5 array continued to work after a TON of syslog messages.
Anyway, I agree that the master-only configuration is much more reliable
from an electrical point of view.
I was wondering how much IDE channels linux 2.2 can handle,
can it handle 8 channels ?
would an Abit with 4 channels + 2 promise ultra 66 cards work ?
or a normal BX mainboard (2 channels) + 3 promise ultra 66 ?
thanks for infos,
Benno.
