IBM xSeries 450 Planning And Installation Manual page 85

Here are some tips for easier identification of devices in the list:
Even with no storage devices, the server has at least two default mappings —
the MemMap entries listed as fs0: and fs1: in Example 4-2 on page 70.
These are read-only RAM disks created during POST so they will always be
available. The first MemMap file system is the content of the 4 MB of NVRAM
assigned to the EFI, and contains a number of drivers. The second MemMap
file system is the content of the NVRAM assigned to the server diagnostics.
The internal disks contain Scsi and HD strings. In Figure 4-2 on page 70:
Scsi(Pun0,Lun0)/HD(Part1,Sig4879D0ED-FFF4-456D-A15C-DD6C856DF2F5)
where Lun0 is disk's SCSI ID, Part1 stands for Partition1, and Sig is the disk's
GUID (discussed in 1.3.1, "GUID Partition Table disk" on page 7).
The disk partitions are numbered from 1 onwards: the first partition is Part1,
the second Part2, and so on.
EFI System Partition is easily identifiable in Figure 4-2 on page 70 if we
realize that EFI is always the first partition on the disk (that is, it is identified by
HD Part1 in the string). In this case it is fs3.
In Figure 4-2 on page 70, the CD-ROM is represented as fs2.
Note: Unless CD-ROM media is inserted, there is no FSx mapping created
for the CD-ROM.
The USB memory devices include the string USB.
File operations in the EFI shell
From the EFI shell you may access FAT/FAT32 file systems on existing disk
partitions, run EFI executables, and manipulate with disk contents on various
media. The EFI executables are text mode utilities similar to DOS or UNIX
commands. In general, EFI commands are not case-sensitive.
Tip: All the EFI executable files have an extension of .EFI. The executables
may be run only from within EFI, not from within any operating system.
Access to the file system on a device is done through the FSn: command (where
n is the file system number shown in the device mapping table). This is similar in
concept to changing drive letters in DOS. You can use the map command at any
time to remind yourself of the available file systems.
71
Chapter 4. Installation