ESA/390), and 8K for architecture level ALS2 (ESAME) and higher. A maximum of
64M may be specified for architecture level ALS0 (S/370), 2048M (2G) for ALS1
(ESA/390) and 16E for architecture level ALS2 (ESAME) and higher.
The default on startum is 2M.
B
‘B’ determines that the number given is specified in bytes (no multiplier).
K
‘K’ determines that the number given is specified in kilobytes (multiplier 2**10).
M
‘M’ determines that the number given is specified in megabytes (multiplier 2**20).
This is the default if no unit is appended.
G
‘G’ determines that the number given is specified in gigabytes (multiplier 2**30).
T
‘T’ determines that the number given is specified in terabytes (multiplier 2**40). On
32-bit machines the unit terabytes is not available.
P
‘P’ determines that the number given is specified in petabytes (multiplier 2**50). On
32-bit machines the unit petabytes is not available.
E
‘E’ determines that the number given is specified in exabytes (multiplier 2**60). 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). 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.
5.45.4 Overview Storage Allocation Units
Unit
Multiplier
Name (Symbol)
IEC Name (IEC Symbol)
Restrictions
B
None
Byte (B)
Byte (B)
K
2**10
Kilobyte (kB)
Kibibyte (KiB)
M
2**20
Megabyte (MB)
Mebibyte (MiB)
