mdadm命令来自于英文词组“multiple devices admin”的缩写,其功能是用于管理RAID磁盘阵列组。作为Linux系统下软RAID设备的管理神器,mdadm命令可以进行创建、调整、监控、删除等全套管理操作。
语法格式:mdadm [参数] 设备名
常用参数:
实例参考
使用四块硬盘设备创建一个指定名称的,级别为RAID10的磁盘阵列组:
[root@liuzhongwei ~]# mdadm -Cv /dev/md0 -n 4 -l 10 /dev/sdb /dev/sdc /dev/sdd /dev/sdemdadm: layout defaults to n2mdadm: layout defaults to n2mdadm: chunk size defaults to 512Kmdadm: size set to 20954112Kmdadm: Defaulting to version 1.2 metadatamdadm: array /dev/md0 started.
查看指定RAID磁盘阵列组设备的简要信息:
[root@liuzhongwei ~]# mdadm -Q /dev/md0/dev/md0: 39.97GiB raid10 4 devices, 0 spares. Use mdadm --detail for more detail.
查看指定RAID磁盘整列组设备的详细信息:
[root@liuzhongwei ~]# mdadm -D /dev/md0/dev/md0: Version : 1.2Creation Time : Wed Jan 13 08:24:58 Raid Level : raid10 Array Size : 41908224 (39.97 GiB 42.91 GB)Used Dev Size : 20954112 (19.98 GiB 21.46 GB)Raid Devices : 4Total Devices : 4 Persistence : Superblock is persistent Update Time : Thu Jan 14 04:49:57 State : cleanActive Devices : 4 Working Devices : 4 Failed Devices : 0Spare Devices : 0 Layout : near=2 Chunk Size : 512KConsistency Policy : resync Name : localhost.localdomain:0 (local to host ) UUID : 289f501b:3f5f70f9:79189d77:f51ca11a Events : 17 Number Major Minor RaidDevice State 0 8 16 0active sync set-A /dev/sdb 1 8 32 1active sync set-B /dev/sdc 2 8 48 2active sync set-A /dev/sdd 3 8 64 3active sync set-B /dev/sde
将指定的硬盘从RAID磁盘阵列组中停止:
[root@liuzhongwei ~]# mdadm /dev/md0 -f /dev/sdbmdadm: set /dev/sdb faulty in /dev/md0[root@liuzhongwei ~]# mdadm /dev/md0 -r /dev/sdbmdadm: hot removed /dev/sdb from /dev/md0
将指定的硬盘添加至RAID磁盘阵列组中:
[root@liuzhongwei ~]# mdadm /dev/md0 -a /dev/sdbmdadm: added /dev/sdb
彻底停用一个RAID磁盘阵列组:
[root@liuzhongwei ~]# mdadm --stop /dev/md0mdadm: stopped /dev/md0