Maximizing Performance and Scalability with IBM WebSphere
H
hardware and system tuning and optimization
for WebSphere-based platforms, 271 “277
hardware clustered solution
architecture and function of, 295 “298
hardware clustering
available for LDAP environments, 345
primary forms of, 295
service availability provided by, 294 “298
hardware upgrade
pilot application costs associated with, 16 “17
hash_area_size parameter
for Oracle system configuration and tuning, 437
HBAs (Host Bus Adaptors). See Host Bus Adaptors (HBAs)
heap
defined, 158
high availability
horizontal clustering for in WebSphere, 307
methods for achieving WebSphere platform, 293 “307
recap of topologies suitable for, 307
WebSphere clustering for, 307
high availability and failover fundamentals
in WebSphere, 292 “293
High Availability Cluster Multiprocessing (HACMP)
clustering solution, 295
as solution for applications using NFS, 349
high CPU utilization of JVM
determining cause of poor performance of, 498
high load average
drilling down to, 476 “478
high-availability database server topologies, 218 “223
architectural considerations and best practices for, 219 “223
high-availability extension
example of for multiple JVMs with multiapplication servers, 215
high-performance WebSphere applications
developing, 395 “410
horizontal and vertical scaling
advantages of combined, 153 “154
horizontal clustering
for high availability in WebSphere, 307
horizontal scaling
example of with WebSphere, 151
vs. vertical scaling, 152 “153
with WebSphere, 150 “152
Host Bus Adaptors (HBAs)
adding to upgrade system performance, 10
hot disaster recovery sites
typical configuration and function of, 300 “301
hot disk
picking with the iostat command, 487 “488
Hot Standby Routing Protocol (HSRP)
by Cisco, 353
hot-standby databases
database availability options, 306
function of, 219 “220
HPjmeter profiler
function of, 511 “513
specifications, 513
user interface, 512
Web site address for downloading, 511
HSRP. See Hot Standby Routing Protocol (HSRP)
HTTP plug-in
function of, 54 “58
HTTP plug-in configuration file
code example for declaring the ConnectTimeout setting and value, 322 “323
code for mapping to WebSphere 4 dual instance Web container configurations, 314 “315
code for mapping to WebSphere 5 dual instance Web container configurations, 315 “316
default virtual host section of, 56 “57
example of in WebSphere, 54 “56
noncontext configuration section of, 56
Route directive section in, 57 “58
ServerGroup directives in, 58
UriGroup directive declaration section of, 57
HTTP plug-in directive
for setting ConnectTime, 332 “333
for setting RetryInterval, 331 “332
HTTP plug-in topology
example in WebSphere, 55
HTTP server
function of with WebSphere, 53 “54
third-party HTTP server platforms, 54
HTTP server clustering, 294
HTTP servers/Web server tier
in a WebSphere high availability environment, 303 “304
HTTP sessions
importance of invaliding when they aren't required, 398 “399
HTTP Web server
WebSphere queue settings, 285
HTTP Web server plug-in
code example of a WebSphere 4 configuration file, 311 “312
code example of a WebSphere 5 configuration file, 312
function of, 311 “329
Hypertext Markup Language (HTML)
Web container processing of static content from, 59 “60
HyperTransport bus
incorporated in the AthIon 64, 89