HP XP20000/XP24000 HP StorageWorks XP Disk Array Configuration Guide (T5278-96 - Page 138

SCSI TID map for Fibre Channel adapters

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Table 32 LUSE device parameters (HP-UX) (continued) Device type Physical extent size (PE) Max physical extent size (MPE) n = 22 8 38205 n = 23 8 39942 n = 24 8 41679 n = 25 8 43415 n = 26 8 45152 n = 27 8 46889 n = 28 8 48625 n = 29 8 50362 n = 30 8 52098 n = 31 8 53835 n = 32 8 55572 n = 33 8 57308 n = 34 8 59045 n = 35 8 60782 n = 36 8 62518 OPEN-L*n n = 2 to 3 default default OPEN-8/9/E-CVS OPEN-V default default OPEN-8/9/E*n-CVS OPEN-V*n (n = 2 to 36) 70 to 119731(MB) × N1 8 default 119732 to (MB) × N1 8 N2 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 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

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Table 32 LUSE device parameters (HP-UX)
(continued)
Max physical extent size
(MPE)
Physical extent size (PE)
Device type
38205
8
n = 22
39942
8
n = 23
41679
8
n = 24
43415
8
n = 25
45152
8
n = 26
46889
8
n = 27
48625
8
n = 28
50362
8
n = 29
52098
8
n = 30
53835
8
n = 31
55572
8
n = 32
57308
8
n = 33
59045
8
n = 34
60782
8
n = 35
62518
8
n = 36
default
default
n = 2 to 3
OPEN-L*n
default
default
OPEN-8/9/E-CVS OPEN-V
default
8
70 to 119731(MB) × N1
OPEN-8/9/E*n-CVS
OPEN-V*n (n = 2 to 36)
N2
8
119732 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 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