kern/123666: [aac] aac(4) will not work with Adaptec SAS RAID 3805 controller

[Ed Maste]

>  but in 7.0-STABLE all worked fine
>  
>  msk-srv# uname -mr
>  7.0-STABLE amd64
>  msk-srv# dmesg | grep ^aa
>  aac0: <Adaptec RAID 3805> mem 0xd8400000-0xd85fffff irq 18 at device 14.0 o=
>  n pci11
>  aac0: Enabling 64-bit address support
>  aac0: Enable Raw I/O
>  aac0: Enable 64-bit array
>  aac0: New comm. interface enabled
>  aac0: [ITHREAD]
>  aac0: Adaptec 3805, aac driver 2.0.0-1
>  aacp0: <SCSI Passthrough Bus> on aac0
>  aacp1: <SCSI Passthrough Bus> on aac0
>  aacp2: <SCSI Passthrough Bus> on aac0
>  aacd0: <Volume> on aac0
>  aacd0: 953690MB (1953157120 sectors)
>  aacd1: <RAID 5> on aac0
>  aacd1: 5722190MB (11719045120 sectors)

It looks like this followup was to the wrong PR;  kern/123666 is about
a failure of the driver to attach.  Your issue is that your RAID-5 array
is larger than 2TB and the driver in 7.0-RELEASE is missing support for
that; it is fixed in RELENG_7 and will be in 7.1.

-Ed