Maximizing Performance and Scalability with IBM WebSphere
N
names services server
function of in WebSphere 5, 75
NAS (Network Attached Storage). See Network Attached Storage (NAS)
Net Present Value (NPV) vs. Total Cost of Ownership (TCO), 23
netstat command
finding the number of TIME_WAIT state connections with, 389
netstat -i command
obtaining network performance statistics with, 491
netstat -i interface_name command
for showing network- related errors in Linux, 494
netstat tool
for monitoring Oracle and DB2 for performance issues, 442
network
effect of a large database workload environment on, 433 “434
Network Attached Storage (NAS), 122
function of, 125 “126
network components
function of, 163
support for in WebSphere, 306 “307
network configuration
intelligent routing in, 276 “277
system and hardware tuning and optimization for, 276 “277
Network controllers and interfaces, 140 “145
network errors
commands for probing additional, 493 “494
selecting counters to test for, 494
in Windows and Unix, 493 “495
network infrastructure availability, 352 “370
overview, 352 “353
network performance
determining cause of poor, 499 “500
monitoring, 490 “497
monitoring in Unix, 490
network technology
importance of using fastest possible in networks, 351
network utilization
example calculation for, 491 “492
key values in Performance tool output, 496
monitoring in Unix, 490 “493
script for monitoring, 492
in Windows environments, 495 “497
networks
main categories of within a WebSphere environment, 162 “164
New Heap
managing in Sun HotSpot JVM, 288
NFS
configuration issues, 348
example of basic implementation, 348
implementation and performance, 347 “350
options, 347 “350
options for using in a WebSphere environment, 348
NFS cluster
importance of failover time within, 351 “352
NFS implementation
considerations when looking at highly available, 350 “352
example of basic, 348
example of highly available, 350
file locking and I/O management in, 352
NFS server availability
for exposing server files to other servers, 347 “352
NO_IMPLEMENT exception, 340
NO_RESPONSE message, 339
node
contents of in WebSphere 5, 72 “73
node agent
in WebSphere 5, 73
None type
in Oracle Transparent Application Failover, 368
nonraw file systems vs. raw file systems, 435
non-Web-based WLM topology
advantages of, 202 “203
differences in topology design considerations, 202
disadvantages of, 203 “204
final considerations for using, 204
non-Web-based workload management topology
considerations for, 202
Novell eDirectory server
supported by WebSphere, 344
NPV. See Net Present Value (NPV)