Scsi Tid Map For Fibre Channel Adapters - HP XP20000/XP24000 Configuration Manual

Table 32 LUSE device parameters (HP-UX) (continued)
Device type
OPEN-L*n
OPEN-8/9/E-CVS OPEN-V
OPEN-8/9/E*n-CVS
OPEN-V*n (n = 2 to 36)
N1 = [ VCS volume capacity (in MB) from Remote Console PC ] × nN2 =
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 because 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
138 Disk array supported emulations
n = 22
n = 23
n = 24
n = 25
n = 26
n = 27
n = 28
n = 29
n = 30
n = 31
n = 32
n = 33
n = 34
n = 35
n = 36
n = 2 to 3
70 to 1 19731(MB) × N1
1 19732 to (MB) × N1
Physical extent size (PE)
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
default
default
8
8
N1 / PE
Max physical extent size
(MPE)
38205
39942
41679
43415
45152
46889
48625
50362
52098
53835
55572
57308
59045
60782
62518
default
default
default
N2
( means round up to next