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电梯直达

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发表于 2011-08-26 14:16 |只看该作者 |倒序浏览

IBM DS3500标配4个分区，不太理解，存储是可以做多组RAID，是一个RAID里面只能有四个分区，还是不管几组RAID，就只能有4个分区，（比如说我在一个RAID里面分了4个logical drive，其他RAID里面还能在分出来logical drive吗？）另外，logical drive和lun 是一个东西吗？

drive, logical, LUN, 分区, drive, logical, LUN, 分区

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lei8c8

家境小康

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发表于 2011-08-26 16:49 |只看该作者

IBM DS3000系列中
Logical drive=LUN，你可以建立很多logical drive
RAID Group=Array

分区和LUN mapping有关

What are storage partitions?
Storage partitioning is a base feature of the  . A  is a logical entity that uses one or more  that can be accessed by a single host. It can also be shared among hosts that are part of a host group. The first time you map a logical drive to a specific host or host group, a storage partition is made. Subsequent logical drive mappings to that host or host group do not make another storage partition.
Do not use more than one storage partition under these conditions:
You have only one attached host that accesses all of the logical drives in the storage subsystem.
You prepare to have all attached hosts share access to all logical drives on the storage subsystem. When you use this type of configuration, all of the hosts must have the same operating system. You also must have special software on the hosts (such as clustering software) to manage logical drive sharing and accessibility.
You must use more than one storage partition under these conditions:
You want specific hosts to access specific logical drives in the storage subsystem.
You have hosts with different operating systems attached to the same storage subsystem. You must make a storage partition for each type of host.

What can I map a logical drive to?
You can map a  to a  or  . When you map the first logical drive to a host or host group, you automatically create a storage partition. Any mappings that you create after the first mapping do not create new storage partitions. These examples show how logical drive mappings work.
Example 1 – You map logical drive 1 to a host named Fred, which creates the first map for logical drive 1. This mapping creates a storage partition that contains host Fred and logical drive 1. Then you map logical drive 2 to host Fred. Mapping logical drive 2 to host Fred does not create a new partition. The partition contains host Fred with mappings to logical drive 1 and logical drive 2.
Example 2 – You map logical drive 3 to host group Barney, which creates the first map for logical drive 3. Host group Barney contains host Bar1 and host Bar2. Mapping logical drive 3 to host group Barney creates a new partition. The partition contains host Bar1, host Bar2, and logical drive 3. Host Bar1 and host Bar2 can access logical drive 3 with the same  . (The LUN is a value that identifies logical drive 3.) At a different time, you map logical drive 4 to host group Barney. Mapping logical drive 4 to host group Barney does not create a new partition. Now the partition contains host group Barney (host Bar1 and host Bar2), logical drive 3, and logical drive 4.
Example 3 – You map logical drive 5 to host Bar1, which is in host group Barney. When you map to a single host in a host group, you do not map to the entire host group. By mapping logical drive 5 to only host Bar1, you create a new storage partition. The new storage partition contains host Bar1 and logical drive 5. Bar2 does not have access to logical drive 5.