1. DDMs(physical disk drives).
2. Array Sites
8 DDMs of same speed and capacity for DS8000.
3. Array
For DS8000, One 8-DDM Array Site used to construct one RAID array.
For DS8000, Array Site to Array is One to One.
Must select a RAID type for an array.
4. Rank
For DS8000, One Array forms one FB Rank or CKD Rank.
For a Rank, it's available space is divided into extends.
For a Extent , it can across all disks of an array. And it's capacity is 1GB.
5. Extent Pool
An Extent Pool is constructed by the extends from a set of Ranks.
An Extent Pool can contain a set of Ranks, all the ranks must be have the same RAID type and the same disk RPM(the same capacity and the same speed).
6. LUN
A LUN is a logical volume composed of fixed block extends. These extends must be from one FB Extent Pool.
One LUN can not acrross multi Extent Pool.
One LUN can acrross multi Rank in one Extent Pool.
The format of LUN ID : xyzz, x=address group xy=LSS zz=volume ID
7. LSS
A LSS is composed of a set of Logical Volumes.
LSS can acrross multi Extent Pools.
Logical Volume can not acrross multi Extent Pools.
A Logical Volume(FB Type) = A LUN.
8. Address Group
An Address Group is composed of 16 LSSs. All of the 16 LSSs have the same stgType(FB or CKD).
9. Volume Group
A VG is composed of a set of logical volumes(LV). The LV can come from different Extent Pool.
LVs in a same Extend Pool can belongs to different VGs.
A LV can belong to multi VGs. As seen in the below figure(volume1/2/3).
volume1/2/3同时属于三个VG：DB2-1，DB2-2，DB2-test。可以认为volume1/2/3被这三个VG共享。对于volume1 来讲，它是否可以把一部分空间分配给host AIXprod1，另一部分空间分配给host AIXprod2？
10. 命令
列出所有的arraysite：lsarraysite
列出所有的array：lsarray
列出所有的rank：lsrank
列出所有的Extent Pool：lsextpool
创建LUN：mkfb vol 可见LUN是fb格式的volume
列出所有vg：lsvolgrp
列出所有host连接：lshostconnection
列出所有IO port：lsioport