hardware mirrors recognized as individual disks in fbsd

Steve Franks stevefranks at ieee.org
Tue Jan 23 18:14:24 UTC 2007

dmesg gives me:

atapci1: <AcerLabs M5287 SATA150 controller> port
mem 0xdffff800-0xdffffbff irq 21 at device 31.1 on pci0

Two pairs of drives are identical in terms of partitions, and no ar0
devices found, So I'd guess I have one of those "crappy software
raid's:" that you mention.  Guess I'll buy 2 new disks, format to
165's, build a BSD-software raid, take the two of the origonals over
to the neighbor's for an off-site backup.

Thanks all,

On 1/22/07, Damian Wiest <dwiest at vailsys.com> wrote:
> On Tue, Jan 16, 2007 at 11:33:47AM -0700, Steve Franks wrote:
> > I'm tired of win2k crashing, and we won't even go into my opinion of vista's
> > strongarm marketing tactics (read: changing my hardware means I have to pay
> > again? they can keep their OS).
> >
> > Problem is, I've got 320GB of accumulated detrius on ntfs volumes to
> > migrate.  I see there is some good r/w ports for ntfs, so I'm willing to
> > evaluate that to see if it's stable (shoestring budget here obviously - this
> > is my personal stuff only).
> >
> > Forging ahead, I get ready to start playing the mounting game, but
> > lo-and-behold, suddenly I have 4 disks whereas in windows I had two.  Now I
> > praise FreeBSD for it's superior intellect here, but now I have a problem.
> > I want two 160GB mirrored volumes, not 4 unmirrored ones.  The RAID is an
> > ASUS P5DR1-VM motherboard with a ULI raid chipset onboard.  Very nice setup
> > for the money.
> >
> > Is this normal?  Am I going to break my mirror if I mount a single disk?  If
> > so, how do I mount a mirror?
> >
> > Thanks,
> > Steve
> >
> > --
> > Steve Franks, KE7BTE
> > Staff Engineer
> > La Palma Devices, LLC
> > http://www.lapalmadevices.com
> > (520) 312-0089
> It sounds like your onboard RAID chip is either not supported, or the
> appropriate driver is not being loaded.  Can you post the output of
> dmesg?
> Also, be aware that you may not really have a hardware RAID chip.
> Many (most?) times the onboard chips simply make multiple disks look
> like a single LUN to the operating system; they also require driver
> support.  Real hardware RAID chips/cards tend to be expensive,
> proprietary, don't require an OS driver and include a battery backup
> system for data in the RAID cache should the system lose power.
> You may want to read up on gmirror.
> -Damian
> ps. I've got at least a half-dozen different x86 system boards that
>     include these crappy RAID chips from vendors like nVidia, Intel,
>     Adaptec, LSI, etc.  Typically you get closed-source, Windows-only
>     driver support.
> pps. If you do want real hardware RAID support under FreeBSD, I've had
>      great experiences with the Promise arrays (m500 and m300) and
>      one of the PCI cards (I'd have to check on the exact model).

Steve Franks, KE7BTE
Staff Engineer
La Palma Devices, LLC
(520) 312-0089

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