Getting started the hard way with RAID

Marius Gedminas marius at
Sat Dec 3 15:16:35 UTC 2011

On Fri, Dec 02, 2011 at 09:44:28AM -0800, Kevin O'Gorman wrote:
> On Fri, Dec 2, 2011 at 1:30 AM, Marius Gedminas <marius at> wrote:
> > On Thu, Dec 01, 2011 at 06:56:30PM -0800, Kevin O'Gorman wrote:
> >> I'm in the late stages of recovering a broken system.  The original
> >> had a hardware raid controller managing a mirror set that contained
> >> some stuff that was not backed up. Fortunately, one reason it wasn't
> >> backed up is that it wasn't really vital.  Nevertheless, I'd like to
> >> get at that stuff.
> >>
> >> The hard part is that I no longer have that RAID controller, just the
> >> two drives.  The controller was a 64-bit PCI card, and the new mobo
> >> cannot handle it.
> >
> > Have you googled for the model and manufacturer of that RAID controller?
> Not yet, but I will.  It was a 3ware 9550SX controller.

$ dmraid -l
asr     : Adaptec HostRAID ASR (0,1,10)
ddf1    : SNIA DDF1 (0,1,4,5,linear)
hpt37x  : Highpoint HPT37X (S,0,1,10,01)
hpt45x  : Highpoint HPT45X (S,0,1,10)
isw     : Intel Software RAID (0,1,5,01)
jmicron : JMicron ATARAID (S,0,1)
lsi     : LSI Logic MegaRAID (0,1,10)
nvidia  : NVidia RAID (S,0,1,10,5)
pdc     : Promise FastTrack (S,0,1,10)
sil     : Silicon Image(tm) Medley(tm) (0,1,10)
via     : VIA Software RAID (S,0,1,10)
dos     : DOS partitions on SW RAIDs

No 3ware here.  A quick Google seems to confirm that dmraid is mostly
for fakeraid devices, while 3ware is a real hardware RAID controller.

(I'm not sure what the difference is -- so the RAID logic runs on an
embedded CPU on the daughter card instead of your main CPU, which makes
performance better, but why would that have any impact on on-disk
metadata formats?)

Looks like you may need to buy a 3ware RAID card if you want to recover
your data.

Marius Gedminas
#define QUESTION ((bb) || !(bb)) /* Shakespeare */
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