Service manual

Sizing Physical Memory
Chapter 4 Hardware Sizing 81
OnWindowssystems,formatdrivesasNTFSratherthanFAT.FATisnot
supported for use with Directory Server. NTFS allows access controls to be set on
files and directories.
Minimum Processing Power
High volume systems typically employ multiple, high-speed processors to provide
appropriate processing power for multiple simultaneous searches, extensive
indexing, replication, and other features.Refer to “Sizing for Multiprocessor
Systems,” on page 94 for details.
Minimum Network Capacity
Testing has demonstratedthat 100 Mbit Ethernet may be sufficient for even service
provider performance, depending on the maximum throughput expected. You
may estimate theoretical maximum throughput as follows:
max. throughput = max. entries returned/second x average entry size
Imagine for example that a Directory Server must respond to a peak of 5000
searches per second for which it returns 1 entry each with entries having average
size of 2000 bytes, then the theoretical maximum throughput would be 10 MB, or
80 Mbit. 80 Mbit is likely to be more than a single 100 Mbit Ethernet adapter can
provide. Actual observed performance may vary.
If you expectto perform multi-masterreplicationover a wide area network, ensure
the connection provides sufficient throughput with minimum latency and
near-zeropacketloss.
Refer to “Sizing Network Capacity,” on page 94 for more information.
Sizing Physical Memory
Directory Server stores information using database technology. As is the case for
any application relying on database technology, adequate fast memory is key to
optimum Directory Server performance.As arule, the more memory available, the
more directory information can be cached for quick access. In the ideal case, each
serverhas enough memory to cachethe entire contents of the directory at all times.
As Sun ONE Directory Server 5.2 supports 64-bit memory addressing, cache sizes
are no longer limitedto several gigabytes. Instead, it is now theoretically possible
to handle total cache sizes of over 1.5 terabytes on 64-bit architectures.