installing as a degraded RAID-1 mirror

[Matthew Miller]

On Fri, Jun 17, 2005 at 02:51:14PM -0400, Jack Howarth wrote:
>     Does anyone know if it is possible to install FC4 on a new
> machine with a single SCSI drive as a degraded RAID-1 mirror?
> That is, can one just create a set of software RAID-1 mirror
> partitions in diskdruid using just the partitions from a single
> drive? The idea would be to get FC4 on the machine and then
> add a second SCSI drive later to use for the missing RAID-1

I just checked, and the installer won't let you create a RAID without at
least two devices. So, unless I'm missing something, looks like a "no".

> partitions. Also, I have had good luck with the performance of
> two SATA drives attached to the same Promise SATA controller.
> What sort of speed hit am a likely to take by using two SCSI
> drives on the same controller compared to the SATA configuration?

As I understand it SATA controllers are always always one device per
channel, even if it's the same controller. 

Meanwhile SCSI is designed so you can have a bunch of things talking on the
same cable at once without it being a big deal. You'll probably get better
performance than with SATA.



-- 
Matthew Miller           mattdm at mattdm.org        <http://www.mattdm.org/>
Boston University Linux      ------>                <http://linux.bu.edu/>
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