HP StorageWorks Disk Array XP operating system configuration guide for HP-UX XP24000, XP12000, XP10000, SVS200, v01 (A5951-96018, June 2007)

Max physical extent size
(MPE)
Physical extent
size (PE)
Device type
625188n = 36
defaultdefaultn = 2 to 3OPEN-L*n
defaultdefaultOPEN-8/9/E-CVS OPEN-V
default870 to 119731(MB) × N1OPEN-8/9/E*n-CVS
OPEN-V*n (n = 2 to
36)
N28119732 to (MB) × N1
N1 = [ VCS volume capacity (in MB) from Remote Console PC ] × nN2 = N1 / PE ( means round up to
next integer) Example: CVS volume capacity is 6000 MB for OPEN-9*22-CVS volume:N1 = 6000 × 22 =
132000N2 = 132000/8 = 16500
SCSI TID map for Fibre Channel adapters
When an arbitrated loop (AL) is established or reestablished, the port addresses are assigned
automatically to prevent duplicate TIDs. With the SCSI over Fibre Channel protocol (FCP), there is no
longer a need for target IDs in the traditional sense.
SCSI is a bus-oriented protocol requiring each device to have a unique address since all commands
go to all devices. For Fibre Channel, the AL-PA is used instead of the TID to direct packets to the
desired destination.
Unlike traditional SCSI, when control of the loop is acquired, a point-to-point connection is established
from initiator to target. To enable transparent use of FCP, the operating system maps a TID to each
AL-PA.
The host maps SCSI protocol to Fibre Channel protocol and detects and accesses Fibre
Channel-connected devices using device files (/dev/dsk/c*t*d* and /dev/rdsk/c*t*d*) in
the same way as for SCSI-connected devices. The device files for Fibre Channel-connected devices
are configured in a different way from SCSI-connected devices, because Fibre Channel supports 126
addresses per path while SCSI supports 16 TIDs per path.
The following table identifies the fixed mappings between the TID (drive) values assigned by the
operating system and the Fibre Channel native addresses (AL_PA/SEL_ID) for Fibre Channel adapters.
The controller number (the dks value in /dev/dsk/dks*d*l*s*) depends on the server configuration,
and a different value is assigned per each column.
The mapping cannot be done when these conditions exist:
• Disk array devices and other types of devices are connected in the same loop
• Information for unused devices remains in the server system
• Multiple ports participate in the same arbitrated loop
Table 13 SCSI TID map
AL-PAAL-PAAL-PAAL-PAAL-PAAL-PAAL-PAAL-PAt value
253A557298B2CDEF0
2339547197B1CCE81
Disk array supported emulations44