HP XP Racks - Manual (Page 16)

Figure 3 RAID Manager Configuration on VIO Client
The restrictions for using RAID Manager on AIX VIO are:
1.
Command device. RAID Manager uses the SCSI Path-through driver for accessing the command
device. Therefore, the command device must be mapped as RAW device of Physical Mapping
Mode. At least one command device must be assigned for each VIO Client. The RAID Manager
instance numbers among different VIO Clients must be different, even if the command is
assigned for each VIO Client, because the command device cannot distinguish between VIO
Clients due to use of the same WWN via vscsi.
2. LUN sharing between VIO Server and VIO Clients. It is not possible to share a command device
between VIO Server and VIO Clients, and a normal Lun also cannot be shared between VIO
Server and VIO Clients.
3. Volume discovery via vscsi on VIO Client. The inqraid command discovers the volume
information by using SCSI inquiry, but VIO Client cannot report the real SCSI inquiry (Page0
and Page83) as shown below.
Example for inqraid command:
lsdev -Cc disk | /HORCM/usr/bin/inqraid
hdisk0 -> NOT supported INQ. [AIX ] [VDASD ]
hdisk1 -> NOT supported INQ. [AIX ] [VDASD ]
hdisk2 -> NOT supported INQ. [AIX ] [VDASD ]
:
:
hdisk19 -> NOT supported INQ. [AIX ] [VDASD ]
The following commands discover the volumes by issuing SCSI inquiry. These commands
cannot be used, because there is no port/LDEV for RAID information.
raidscan -pd <device>, raidar -pd <device>, raidvchkscan -pd <device>
raidscan -find [conf] , mkconf.sh, inqraid
pairxxx -d[g] <device>, raidvchkdsp -d[g] <device>, raidvchkset
-d[g] <device>
\\.\CMD-Serial#-LDEV#-Port#:/dev/rhdisk on horcm.conf
Therefore, you need to know the volume mapping information (/dev/rhdisk) on the VIO Client
by referring to the physical volume mapping through the VIO Server.
16 Installation requirements