The Virtualization Cookbook for SLES 10 SP2 - z/VM - IBM

00: STORAGE = 256M MAX = 1G INC = 1M STANDBY = 768M RESERVED = 0
00: Storage cleared - system reset.
► Answer yes to boot Linux:
DMSACP723I A (191) R/O
DMSACP723I C (592) R/O
DIAG swap disk defined at virtual address 300 (64989 4K pages of swap space)
DIAG swap disk defined at virtual address 301 (129981 4K pages of swap space)
Do you want to IPL Linux from minidisk 100? y/n
y
...
► Start an SSH session as root and view the memory in the /sys/ file system. Change
directory to /sys/devices/system/memory/ and list the files:
# cd /sys/devices/system/memory
# ls
block_size_bytes memory0 memory1 memory2 memory3
► Type the block_size_bytes file with the cat command:
# cat block_size_bytes
10000000
This number is the number of bytes in hexadecimal. 10000000 in hex is 256 M in decimal.
So the block size is 256 MB and there are four blocks: memory0-memory3, which are
represented as directories. Each of the memory blocks has a state, which is represented
as a file.
► Show the state of each memory block with the following command:
# cat memory*/state
online
offline
offline
offline
This shows that the first 256 MB is online and the next three blocks are offline.
► You can also show information about memory with the free -m command:
# free -m
total used free shared buffers cached
Mem: 241 165 75 0 18 54
-/+ buffers/cache: 92 148
Swap: 761 0 761
This shows 241 MB
► You can turn on memory by sending the string online to the state file. Turn on an
additional 512 MB of memory with the following commands:
# echo online > memory1/state
# echo online > memory2/state
► Show that the memory is now online:
# cat memory*/state
online
online
online
offline
► Again, confirm with the free -m command:
# free -m
total used free shared buffers cached
Mem: 753 170 582 0 18 54
Chapter 13. Miscellaneous recipes 209