有些话题永远不会过时。尽管有许多新技术变得不非常流行,但那些提倡者总是不厌其烦地想重新恢复其辉煌。全球性的分层目录服务就遵循这个规律,它作为一个流行的话题近年来一再被提起。但这次我对它产生了一种奇怪的幻觉般的感觉。在九十年代初期,我们所有的讨论都是围绕着X.500和Novell引入了NDS。而且我们也还没忘记,当Banyan使用StreetTalk directory时所引起的轰动,这使得目录在八十年代成为一个热点话题。但是目录造成的声势随着顾客忙着其他新技术而渐渐消退了。慢慢地,管理者也清醒地意识到,尽管大家都在谈论着元目录和LDAP,实际上有许多最基本的问题在阻止目录的发展,并且变的越来越严重。这点同聚簇技术是很相似的。因为,多年来,采用聚簇技术的操作系统只能提供失败的备份的支持(极少数情况下提供了计算化的应用)。所以人们没有花太多的时间,就对聚簇技术的解决方案失去了热情。并不是说IS的管理者对目 Some topics will never be out of date. Although many new technologies have become less prevalent, those advocates always tire of trying to regain their glories. The global hierarchical directory service follows this rule, and it has been raised repeatedly in recent years as a popular topic. But this time I had a weirdly hallucinatory feeling about it. In the early nineties, all our discussions centered on the introduction of NDS around X.500 and Novell. And we have not forgotten yet, the sensation that caused Banyan to use the StreetTalk directory, which made the directory a hot topic in the 1980s. But the momentum created by the catalog subsided as customers were busy with other new technologies. Slowly, managers are also awake to the realization that while everyone is talking about metadirectory and LDAP, there are actually many of the most basic problems that prevent the directory from growing and getting worse. This is very similar to the clustering technology. Because, over the years, operating systems that use clustering technology can only provide support for failed backups (and in rare cases, computational applications). So if people do not spend too much time, they lose their enthusiasm for clustering solutions. This is not to say that IS’s manager is right