Designing Enterprise Solutions with Sun Cluster 3.0 by Richard Elling

By Richard Elling

I purchased this advisor to reinforce my suncluster3x wisdom. it is a reliable booklet, yet with extra "designs" and functional battle-camp examples it can be a superb selection.

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The DNS data files are stored in the global file system, rather than on the root disk. named(1M) process to read them in, regardless of which node is hosting the service. Because the system creates and destroys the connections for each lookup performed, requests fail if they are being processed when a DNS outage occurs. LDAP The LDAP protocol is gaining popularity as the standard way to store user profile and application configuration data. Products like the iPlanet™ Portal Server and iPlanet Messaging Server, for example, use it extensively to hold user preferences.

A write- behind policy does not immediately write the data to the higher latency memory, thus improving performance if the data is to be written again soon. Obviously, the write-behind policy is considerably more complicated. For this, the hardware or software must maintain information about the state of the data, that is, whether or not the data has been stored in the higher-latency memory. If not, then the data must be written before it can be discarded to make room for other data. If the persistence requirement of the cache and its higher-latency memory is the same, either both are persistent or not, write-behind cache policies make good sense.

The logging option introduced with UFS in the Solaris 7 operating environment stores changes in the metadata, the log of metadata changes, on the disk. This dramatically speeds up the file system check because the metadata can be regenerated completely from the log. File system read caches are used in the Solaris operating environment to store parts (pages) of files that have been read. The default behavior for the Solaris operating environment is to use available RAM as a file system cache. When the Solaris 8 operating environment system gets low on available memory, the system discards file system cached pages in preference to executable files or text pages.

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