Explanation:
On Domino 6.x and 7.x systems where the physical RAM is greater than 2
GB, Domino 6.x and 7.x servers will calculate the maximum size of the Unified
Buffer Manager (UBM) at 3/8 of the physical RAM. This can be problematic
on UNIX systems in particular. The UBM can reach a size of up to 1.5 GB
(assuming 4GB of physical RAM) which can cause failures when the UBM combined
with other Domino shared memory components exceed per-process memory usage
maximums..
Note - this is the same setting as NSF_BUFFER_POOL_SIZE, except that the
buffer pool size is specified in megabytes rather than bytes.
Default:
For 32 Bit Domino 8 and later the default Maximum UBM size is 512 MB (for most operating
systems; 400 MB for z/OS and zLinux.)
For 64 Bit Domino 8 and later the default Maximum UBM size is 1024 MB (for most operating systems; 512 MB for OS400)
For Domino 7.x and earlier, when this
value is not manually overridden, it's calculated as a percentage of available
physical memory.
Domino 7.0.4 for OS390 & zLinux
the value is hard coded to 400 MB
Domino 7.0.4 for all other operating
systems, the calculation is:
1/8 of the first 32 MB, 1/4 of the next
96 MB, and 3/8 of everything beyond that.
Recommendation:
- 32 Bit Domino 8 servers - no action is needed.
The Maximum listed above is the default. Notes.ini
settings specifying a larger size, up to a point, will be honored if present.
- 64 Bit Domino 8 servers - no action is needed.
The Maximum listed above is the default. Notes.ini
settings specifying a larger size, up to a point, will be honored if present.
- Domino 6.x and 7.x servers, bring down
the Domino server. Set NSF_BUFFER_POOL_SIZE_MB using the table below
as a guide. Restart the Domino server.
| Operating system
| Recommended UBM Maximum
(Domino 32-bit)
|
| Windows32
| 512 MB - 750 MB
|
| Linux
| 512 MB - 750 MB
|
| AIX
| 512 MB - 750 MB
|
| Solaris
| 512 MB - 750 MB
|
| i5/OS
| 512 MB - 750 MB
|
| z/OS & zLinux
| 200 MB - 400 MB |
Restrictions:
This is available for all Domino server versions.
Restarts:
The Domino server must be restarted after modifying this setting.
References:
Recommendations
for setting NSF_BUFFER_POOL_SIZE_MB
New
default limit on UBM size in Domino 8
Domino Configuration Tuner:
This setting is included in the
DCT
catalog of best practices.