Software RAID1 with atacontrol

George Hartzell hartzell at
Mon Sep 27 15:18:30 PDT 2004

Pawel Jakub Dawidek writes:
 > On Mon, Sep 27, 2004 at 11:39:20PM +0930, Daniel O'Connor wrote:
 > +> On Mon, 27 Sep 2004 20:47, Pawel Jakub Dawidek wrote:
 > +> > +> Therefore I think that there is something fishy here. Since the same
 > +> > +> code is used for Promise RAID cards, the support for those card may be
 > +> > +> "broken" as well (at least unreliable in case of a crash, which is a
 > +> > +> problem since RAID1 is meant to add reliability in case of a crash).
 > +> > +> What can I do to help debug this ?
 > +> >
 > +> > I can only suggest gmirror(8):)
 > +> 
 > +> You can't boot from gmirror(8) with a hosed disk :(
 > I wonder how BIOS react on such disk. You can setup in BIOS to boot from
 > 'C', 'D', etc. disks and it will be cool if 'D' can be choosen when 'C'
 > is broken.

I have an older Supermicro system (370DER) with a built in two-channel
scsi controller.  It'll happily boot from whatever scsi device I give
it.  I have a pair of disks on channel-A, mirrored using gmirror
(da0s1 and da1s1 are the providers) and it'll happily boot from

Not quite as nice as automaticall falling-over, but close enough for
my particular use.


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