Server 2019 Multi-Path(MPIO)Multi-LUN

1 MPIO几种模式

1.1 Fail Over Only(仅故障转移)

The failover policy employs one active/optimized path and all other paths are active/unoptimized, standby, or unavailable. The non-active/optimized paths will be tried round-robin upon failure of the active/optimized path until an available path is found.

1.2 Round Robin With Subset(协商会议，李彦宏的英文名就叫Robin)

The round robin with subset policy executes the round robin policy only on paths designated as active/optimized. The non-active/optimized paths will be tried on a round-robin approach upon failure of all active/optimized paths.

1.3 Least Queue Depth(最少队列深度)

The least queue depth policy compensates for uneven loads by distributing proportionately more I/O requests to lightly loaded processing paths.

1.4 Weighted Paths(加权路径)

The weighted paths policy allows the user to specify the relative processing load of each path. A large number means that the path priority is low.

1.5 Least Blocks(带子集的协商会议，传说中alua)

The least blocks policy routes requests to the processing path with the least number of pending I/O blocks.

2 MPIO配置详解

(1)添加"Multipath I/O"功能

(2)在MPIO属性中，可以添加存储阵列，有两种方式：一种是手动添加；另一种是Device ID(尽量使用这种方式). 如下图，是手动添加，点击添加，输入供应商(8个字符)和产品ID(16个字符)，如果不够，用空格补全. 添加之后需要重启才能生效.

(3)我们测试一下，在E分区创建一个50G的大文件，当从E分区向C分区拷贝大文件的同时，拔掉一张FC卡上的光纤线缆，看看文件传输过程会不会掉. 从实验结果看，文件传输正常.

3.Mount storage target LUN to OS

(1)登录LUN管理端

(2)Create Volume方式

1)Create LUN 0

2)Create LUN 1

3)Create LUN 2

4)Create LUN 3

5)Create LUN 4

6)Create LUN 5

7)Create LUN 6

8)Create LUN 7

9)Create LUN 8

10)Create LUN 9

11)提示"Volume vd0001_v0010 was created successfully"

12)查看Volume vd0001_v0001信息

13)查看Volume vd0001_v0010信息

(3)Delete Volume方式

(4)查看Vdisk vd0001_RAID1信息

(5)由于测试机接了两张FC卡，可以看到管理端会显示2个Host

1)Host 1

2)Host 2

(6)当我们在管理端创建10个LUN后，在测试机可以看到"磁盘管理器"中生成了10个LUN：Disk 4~13(Offline)

(7)我们让Disk 4~13从Offline变成Online状态，并格式化为之创建分区及盘符