88 Sun Fire V890 Server Owner’s Guide • September 2004
Caution – All internal options (except disk drives and power supplies) must be
installed only by qualified service personnel. For information about installing or
removing a PCI FC-AL host adapter card, see the Sun Fire V890 Server Service
Manual, which is included on the Sun Fire V890 Documentation CD.
About FC-AL Device Addresses
In a Sun Fire V890 internal storage array, each FC-AL device is assigned a unique
selection ID based on its physical location in the storage array. Each slot on the disk
backplane is hard-wired to a different selection ID.
Each FC-AL disk drive is connected directly to a Fibre Channel loop and appears as
a separate node on the loop. Each node on a loop is assigned a unique arbitrated
loop physical address (AL_PA), one of 127 available addresses per loop.
AL_PA values may be hard-assigned or soft-assigned and are determined when the
loop is initialized—typically when booting the system or when adding or removing
a device as part of a hot-plug operation. Hard-assigned AL_PAs are established first,
according to the selection ID for each device. If, for any reason, there are conflicts
with hard-assigned addresses during loop initialization, the devices involved
automatically revert to soft-assigned addresses to resolve the conflicts.
The AL_PA values that are hard-assigned to each device depend on the device’s
location within its backplane (disk slot number). The following table shows the
selection IDs and AL_PA values that are hard-assigned to Sun Fire V890 internal
FC-AL devices, depending on the device location. Both selection IDs and AL_PA
values are expressed as hexadecimal numbers.
Base Backplane Sel ID AL_PA Expansion Backplane Sel ID AL_PA
Disk 0 00 EF Disk 6 08 D9
Disk 1 01 E8 Disk 7 09 D6
Disk 2 02 E4 Disk 8 0A D5
Disk 3 03 E2 Disk 9 0B D4
Disk 4 04 E1 Disk 10 0C D3
Disk 5 05 E0 Disk 11 0D D2
SES processor 06 DC
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