P
‘P’ determines that the number given is specified in petabytes (multiplier 2**50).
Specifying the storage in petabytes is possible only for main storage. On 32-bit
machines the unit petabytes is not available.
E
‘E’ determines that the number given is specified in exabytes (multiplier 2**60).
Specifying the storage in exabytes is possible only for main storage. On 32-bit
machines the unit exabytes is not available.
LOCK
Attempt to lock the storage (pages locked by the host operating system).
UNLOCK
Leave the store unlocked (no pages locked by the host operating system, pageable
by host OS). This is the default.
Notes:
The actual upper limit is determined by the host system’s architecture and operating system and the
amount of physical memory and available paging space. The total of MAINSIZE and XPNDSIZE on host
systems with a 32-bit architecture will be limited to 4G; host systems with a 64-bit architecture will be
limited to less than 16E.
Using minimum storage sizes, storage sizes less than or not on a 64K boundary for architecture level
ALS0 (S/370) or not on a 1M boundary for architecture level ALS1 (ESA/390) and higher, it may be pos-
sible to generate error conditions not covered by the “Principles of Operations”.
Use of storage sizes greater than supported by the guest operating system may generate incorrect re-
sults or error conditions within the guest operating system.
8.47.4 Overview Storage Allocation Units
Unit
Multiplier
Name (Symbol)
IEC Name (IEC Symbol)
Restrictions
B
None
Byte (B)
Byte (B)
Main storage only
K
2**10
Kilobyte (kB)
Kibibyte (KiB)
Main storage only
M
2**20
Megabyte (MB)
Mebibyte (MiB)
G
2**30
Gigabyte (GB)
Gibibyte (GiB)
T
2**40
Terabyte (TB)
Tebibyte (TiB)
Not on 32-bit machines
P
2**50
Petabyte (PB)
Pebibyte (PiB)
Not on 32-bit machines
E
2*60
Exabyte (EB)
Exbibyte (EiB)
Not on 32-bit machines
Table 19: Storage Allocation Units
