ciss and mpt disk devices numbering priority on a DL385 G2

[Kai Gallasch]

Hello,

on a DL385 G2 I needed some JBOD disks and built a SAS controller into
the server, because the builtin Compaq P400 controller does not support
JBOD.

Luckily the 8 x SAS 2.5" drive cage of the server has two SAS connectors
on the back, with one addressing the first four SAS disks (A) and the
other one disks five to eight (B)

So I had the P400 connected to A and the LSI SAS Controller 3442E-R to
connector B of the drive cage.

The problem now is, that with 7.2 Release the SCSI disks of the LSI SAS
controller show up as da0, da1, etc. What I wanted was that disk devices
of the ciss controller take precedence over disk devices of the LSI SAS
controller (mpt driver) so I have da0 as boot disk on the P400

So I have right now..

mpt0: da0
mpt0: da1
ciss0: da3
ciss0: da4

and not as wanted:

ciss0: da0
ciss0: da1
ciss0: da2
mpt0: da3
mpt0: da4

What I already tried:

- Putting the 3442E-R into two different PCIe slots

What options do I have to get the ciss controlled da0-da3 show up before
the mpt devices?

Any hint appreciated,

Cheers,
Kai.

----------------- devices in dmesg -------------

mpt0: <LSILogic SAS/SATA Adapter> port 0x4000-0x40ff mem
0xfddf0000-0xfddf3fff,0xfdde0000-0xfddeffff irq 36 at device 0.0 on pci67
mpt0: [ITHREAD]
mpt0: MPI Version=1.5.19.0
mpt0: Capabilities: ( RAID-0 RAID-1E RAID-1 )
mpt0: 0 Active Volumes (2 Max)
mpt0: 0 Hidden Drive Members (14 Max)

ciss0: <HP Smart Array P400> port 0x5000-0x50ff mem
0xfdf00000-0xfdffffff,0xfdef0000-0xfdef0fff irq 32 at device 0.0 on pci70
ciss0: [ITHREAD]

da0 at mpt0 bus 0 target 8 lun 0
da0: <HP DG146ABAB4 HPDC> Fixed Direct Access SCSI-5 device
da0: 300.000MB/s transfers
da0: Command Queueing Enabled
da0: 140014MB (286749488 512 byte sectors: 255H 63S/T 17849C)

da2 at ciss0 bus 0 target 0 lun 0
da2: <COMPAQ RAID 5  VOLUME OK> Fixed Direct Access SCSI-5 device
da2: 135.168MB/s transfers
da2: Command Queueing Enabled
da2: 26109MB (53472480 512 byte sectors: 255H 32S/T 6553C)

da3 at ciss0 bus 0 target 1 lun 0
da3: <COMPAQ RAID 5  VOLUME OK> Fixed Direct Access SCSI-5 device
da3: 135.168MB/s transfers
da3: Command Queueing Enabled
da3: 143357MB (293596800 512 byte sectors: 255H 32S/T 35980C)

da1 at mpt0 bus 0 target 9 lun 0
da1: <HP DG146ABAB4 HPDC> Fixed Direct Access SCSI-5 device
da1: 300.000MB/s transfers
da1: Command Queueing Enabled
da1: 140014MB (286749488 512 byte sectors: 255H 63S/T 17849C)

da4 at ciss0 bus 0 target 2 lun 0
da4: <COMPAQ RAID 5  VOLUME OK> Fixed Direct Access SCSI-5 device
da4: 135.168MB/s transfers
da4: Command Queueing Enabled