[Info-vax] MSA$UTIL experiment - try build mixed SAS/SATA drive RAID mirror set

[Rod Regier]

As an experiment on an RX2600 with a P400 controller
I tried building a mixed SAS / SATA RAID mirror set.

I know that the above-mentioned configuration will function fine using separate SAS and SATA drives as JBOD, so I was investigating whether a combo would work.

(Possibly handy for failed drive replacement with a SATA disk in the future
for existing SAS-only RAID mirror sets).

It would appear either the controller or MSA$UTIL doesn't support
mixed drive type RAID mirror sets.

I'm not insisting it should be supported (work), but does anyone have more detail?

MSA> add unit 1/disk=(1,2)/raid=1/size=130gb
Mixed drive types are used for the creation of the unit
Please use similar drives. Issue SHOW DISKS command to determine the drive type
MSA> sho disks

 SATA device                                             [Disk]
 Disk 2: bus: 1, Target id: 6, Port: 2I,  Box/Enclosure: 1, Bay: 2,  size 465.76
 [500.11]GB
  Disk 2, # 0, size 976707632 blocks, (465.73 [500.07] GB), Unused.

 SAS device                                              [Disk]
 Disk 1: bus: 1, Target id: 7, Port: 2I,  Box/Enclosure: 1, Bay: 1,  size 136.73
 [146.82]GB
  Disk 1, # 0, size 286683952 blocks, (136.70 [146.78] GB), Unused.