NSF Buffer Pool (Now
know as UBM- Unified Buffer Manager) is responsible for caching disk I/O for
all the databases on a server, improving the performance of the server. The
Notes Index Facility(NIF) operates in the buffer and then Writes/Reads to disk
if it needs to.
How NSF Buffer Pool calculated in Domino Servers?
By default domino
calculates the NSF Buffer Pool Size based on the type of OS and amount of RAM
installed. Roughly it allocates 3/8th of Installed RAM.
Note: You can change the size of Buffer pool by adding a notes.ini
entry “NSF_Buffer_Pool_Size_MB=” (Please refer this technote, before making any
changes )
How to check how much buffer is in use?
In the server console
enter this command
Database.Database.BufferPool.Per*
Note: Over 95 % is good but 99.9% is bad.
Refer the below technotes for more information.
