PLEASE TEST: IPI deadlock avoidance patch

Brad Knowles brad at
Thu Aug 26 16:04:46 PDT 2004

At 5:10 PM -0500 2004-08-26, Craig Boston wrote:

>  Two of the drives in the RAID5 are on:
>  atapci0: <Intel PIIX4 UDMA33 controller>
>  ad0: 9541MB <Maxtor 51024H2/DAC10SC0> [19386/16/63] at ata0-master UDMA33
>  ad2: 9541MB <Maxtor 91024U3/RA530JN0> [19386/16/63] at ata1-master UDMA33
>  The third drive is on:
>  ahc0: <Adaptec 2940 Ultra SCSI adapter>

	Ouch.  Bad juju, bwana.  RAID-5 really, really wants all drives 
to be 100% identical, in every way, shape, and form.  If they're not 
and you're very, very lucky, it might just be slow.

Brad Knowles, <brad at>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <> for more info.

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