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answer is

elac(elac)

1.no relationship bwt physical HD and library, it is a single adressing system, u can NOT xpecify HD, but HD will be grouped by ASP (Aux storage pool), which you can specify when u create a lib.

In IFS, you can create directory and share it as windows directory.
you can even create a storage block to install windows on it (if you have the Hardware).

and in i/5, you can install both OS/400 and AIX.

If you view PF as a file, lib is like directory
if you view pF as a table, lib is like oracle's database

2. PF=table
LF= view+index

3. it supports all types of Raid, Raid 5 is common, if one HD fail, that raid 5 set needs to rebuild. Most users are using 3rd party mirroring software, mimix, ODS, DM etc.
as/400 is a very sucessful commercial computer system, it has anything other system has, but just in a different way.

(#2703277@0)
Last Updated: 2006-1-7
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工作学习 / 专业技术讨论 / 不好意思，AS/400的门外汉问几个AS/400的问题，谢谢您的回答。 -dannyfu(Danny); 2006-1-5 {462} (#2698114@0)
1. 在AS/400中，从physical disk到LIB/OBJ，有哪基层逻辑关系? 比如一个physical disk上可以建立多个device，一个device上可以建立多个lib，一个lib中可以建立多个obj (自己猜测的)
2. 在AS/400中或DB2/400 (不知道这样写对不对) 中，有Physical File和Logical File的概念，Physical File和Logical File相当于开放平台数据库中的什么概念，比如table, index, view?
3. 在AS/400中，磁盘是怎样实现保护的，有没有诸如RAID的概念，是怎样实现的，是硬件的还是软件的，大概什么样的概念？

谢谢。

６年前本饭桶是４００程序员 -lpcome(饭主席); 2006-1-5 {937} (#2698863@0)
仅从程序员观点回答您的问题：

１、physical disk和lib没有关系。印象中在新建lib的时候没法象win or unix那样选建立在哪个‘盘’上，不过不排除当时道行太差看不出来。从现在的眼光看来，稍微高级一点的系统，lib(or dir)都是直接和logical disk打交道，没有说直接和physical打交道的。以AIX为例，filesystem --> logical volumn --> volumn group --> phycial disk；而老土的Tru64 Unix也有类似的LVM概念

４００的lib的概念有点象目录dir，但也不完全是。因为４００只有lib->obj->member这三层结构。不过４００兼容其他文件系统，因此最高层还有qdls之类的存在。

２、４００里面的PF相当于Oracle Table, LF相当于Oracle View；至于Index,概念是差不多的。

３、有Raid概念。印象中可以察看磁盘利用率，看到的几十个盘，利用率都是相近的，例如都是７６％，这样看起来象stripeset。但我个人认为有可能是Raid 5，因为当时的管理员经常说xx硬盘坏了，要换，但没提要restore。赫赫，当时我不是搞系统的，对这些东西不很敏感。程序员的权限也导致我没法察看是否有象AIX那样的软件Mirror VG,LV之类。

answer is -elac(elac); 2006-1-7 {848} (#2703277@0)
1.no relationship bwt physical HD and library, it is a single adressing system, u can NOT xpecify HD, but HD will be grouped by ASP (Aux storage pool), which you can specify when u create a lib.

In IFS, you can create directory and share it as windows directory.
you can even create a storage block to install windows on it (if you have the Hardware).

and in i/5, you can install both OS/400 and AIX.

If you view PF as a file, lib is like directory
if you view pF as a table, lib is like oracle's database

2. PF=table
LF= view+index

3. it supports all types of Raid, Raid 5 is common, if one HD fail, that raid 5 set needs to rebuild. Most users are using 3rd party mirroring software, mimix, ODS, DM etc.
as/400 is a very sucessful commercial computer system, it has anything other system has, but just in a different way.
谢谢饭主席，您的回答非常有帮助，我正在用业余时间研究，争取有个全面的概念性的收获，到时候在和大家共享。 -dannyfu(Danny); 2006-1-8 (#2706600@0)

@Calgary

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