Lpar Memory Fragmentation - Hitachi Compute Blade 2000 User Manual

LPAR memory fragmentation

With LPAR manager firmware version 59-1X/79-1X or earlier, when you repeatedly
activate and deactivate LPARs with different memory size, a message "Memory
allocation failed (Fragmentation)." appears and an LPAR might fail to be activated even
if the memory size is enough. This is called "LPAR memory fragmentation", which
occurs in activating an LPAR that requires discontinuous blank memories on physical
memory. A typical example is shown below:
(1) Example of failure in LPAR activation due to LPAR memory fragmentation
When all blank memories including five or more discontinuous ones are allocated to
LPARs, LPAR activation fails.
Memory allocation
(Example)
LPAR 1 3 GB
LPAR 2 1 GB
LPAR 3 1 GB
LPAR 4 1 GB
LPAR 5 1 GB
LPAR 6 1 GB
LPAR 7 1 GB
LPAR 8 1 GB
LPAR9 1 GB
LPAR 10 20 GB
Memory allocation
(Example)
LPAR 1
blank
1. Activates
LPAR 3
LPARs with
an even
blank
number.
LPAR 5
blank
LPAR 7
blank
LPAR9
blank
LPAR manager screen (Example)
+-------------------------------------------------+
| Memory Allocation Display
| # Mem Org Addr (Hex)
| 1 00000000 00000000
| 2 00000000 30000000
| 3 00000000 c0000000
| 4 00000001 00000000
| 5 00000001 30000000
| 6 00000001 70000000
| 7 00000001 b0000000
| 8 00000001 f0000000
| 9 00000002 30000000
| 10 00000002 70000000
| 11 00000002 b0000000
| 12 00000002 f0000000
| 13 00000003 30000000
| 14 00000008 00000000
| [PageUp]:Page Up / [PageDown]:Page Down
+-------------------------------------------------+
1389
3 GB
1 GB
2. Activates
LPARs with
1 GB
24 GB
memory.
1 GB
1 GB
1 GB
1 GB
1 GB
1 GB
20 GB
|
Mem Size Name |
768MB SYS2 |
2304MB LPAR1 |
256MB SYS1 |
768MB LPAR1 |
1024MB ******** |
1024MB LPAR3 |
1024MB ******** |
1024MB LPAR5 |
1024MB ******** |
1024MB LPAR7 |
1024MB ******** |
1024MB LPAR9 |
19712MB ******** |
512MB ******** |
|