16.再次查看状态。
[root@localhost ~]# cat /proc/mdstat Personalities : [raid1] [raid0] md10 : active raid0 md102[1] md101[0] 41871360 blocks super 1.2 512k chunks md102 : active raid1 sdd1[2] sde1[1] 20953088 blocks super 1.2 [2/1] [_U] [====>................] recovery = 23.8% (5000704/20953088) finish=1.2min speed=208362K/sec md101 : active raid1 sdb1[2] sdc1[1] 20953088 blocks super 1.2 [2/1] [_U] [======>..............] recovery = 32.0% (6712448/20953088) finish=1.1min speed=203407K/sec unused devices: <none> [root@localhost ~]# cat /proc/mdstat Personalities : [raid1] [raid0] md10 : active raid0 md102[1] md101[0] 41871360 blocks super 1.2 512k chunks md102 : active raid1 sdd1[2] sde1[1] 20953088 blocks super 1.2 [2/2] [UU] md101 : active raid1 sdb1[2] sdc1[1] 20953088 blocks super 1.2 [2/2] [UU] unused devices: <none> [root@localhost ~]# mdadm -D /dev/md101 /dev/md101: Version : 1.2 Creation Time : Sun Aug 25 16:53:00 2019 Raid Level : raid1 Array Size : 20953088 (19.98 GiB 21.46 GB) Used Dev Size : 20953088 (19.98 GiB 21.46 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Update Time : Sun Aug 25 17:07:28 2019 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Consistency Policy : resync Name : localhost:101 (local to host localhost) UUID : 80bb4fc5:1a628936:275ba828:17f23330 Events : 45 Number Major Minor RaidDevice State 2 8 17 0 active sync /dev/sdb1 1 8 33 1 active sync /dev/sdc1 [root@localhost ~]# mdadm -D /dev/md102 /dev/md102: Version : 1.2 Creation Time : Sun Aug 25 16:53:23 2019 Raid Level : raid1 Array Size : 20953088 (19.98 GiB 21.46 GB) Used Dev Size : 20953088 (19.98 GiB 21.46 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Update Time : Sun Aug 25 17:07:36 2019 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Consistency Policy : resync Name : localhost:102 (local to host localhost) UUID : 38abac72:74fa8a53:3a21b5e4:01ae64cd Events : 39 Number Major Minor RaidDevice State 2 8 49 0 active sync /dev/sdd1 1 8 65 1 active sync /dev/sde1 常用 RAID 间比较# 名称硬盘数量容量/利用率读性能写性能数据冗余RAID0 N N块总和 N倍 N倍 无，一个故障，丢失所有数据
RAID1 N（偶数） 50% ↑ ↓ 写两个设备，允许一个故障
RAID5 N≥3 (N-1)/N ↑↑ ↓ 计算校验，允许一个故障
RAID6 N≥4 (N-2)/N ↑↑ ↓↓ 双重校验，允许两个故障
RAID10 N（偶数，N≥4） 50% (N/2)倍 (N/2)倍 允许基组中的磁盘各损坏一个
一些话#
此篇涉及到的操作很简单，但是，有很多的查看占用了大量的篇幅，看关键点，过程都是一个套路，都是重复的。
