【正文】 失效 [rootlocalhost /] mdadm /dev/md1 f /dev/sdc1 /dev/sdc2 mdadm: set /dev/sdc1 faulty in /dev/md1 mdadm: set /dev/sdc2 faulty in /dev/md1 raid1 [rootlocalhost /] mdadm create /dev/md1 level=1 raiddevices=2 /dev/sdd /dev/sdc mdadm: array /dev/md1 started. 詳細信息 [rootlocalhost /] mdadm detail /dev/md1 /dev/md1: Version : Creation Time : Sun Apr 8 01:53:03 2020 Raid Level : raid1 Array Size : 104384 ( MiB MB) Used Dev Size : 104384 ( MiB MB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Sun Apr 8 01:53:14 2020 28 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : 6bb034a0:f113a422:0f314a33:f0c11868 Events : Number Major Minor RaidDevice State 0 8 48 0 active sync /dev/sdd 1 8 32 1 active sync /dev/sdc 分區(qū) [rootlocalhost /] fdisk /dev/sdd l Disk /dev/sdd: 106 MB, 106954752 bytes 64 heads, 32 sectors/track, 102 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Device Boot Start End Blocks Id System /dev/sdd1 1 49 50160 fd Linux raid autodetect /dev/sdd2 50 102 54272 fd Linux raid autodetect [rootlocalhost /] fdisk /dev/sdc l Disk /dev/sdc: 106 MB, 106954752 bytes 64 heads, 32 sectors/track, 102 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Device Boot Start End Blocks Id System /dev/sdc1 1 49 50160 fd Linux raid autodetect /dev/sdc2 50 102 54272 fd Linux raid autodetect 管理 設備失敗 [rootlocalhost /] mdadm /dev/md1 fail /dev/sdd mdadm: set /dev/sdd faulty in /dev/md1 設備移除 [rootlocalhost /] mdadm /dev/md1 remove /dev/sdd mdadm: hot removed /dev/sdd 設備增加 [rootlocalhost /] mdadm /dev/md1 add /dev/sdf?增加了一塊全新的硬盤 [rootlocalhost /] mdadm detail /dev/md1 /dev/md1: Version : Creation Time : Sun Apr 8 01:53:03 2020 29 Raid Level : raid1 Array Size : 104384 ( MiB MB) Used Dev Size : 104384 ( MiB MB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Sun Apr 8 02:27:05 2020 State : clean, degraded, recovering Active Devices : 1 Working Devices : 2 Failed Devices : 0 Spare Devices : 1 Rebuild Status : 73% plete?raid1 陣列自行完成數(shù)據(jù)的重建 UUID : 6bb034a0:f113a422:0f314a33:f0c11868 Events : Number Major Minor RaidDevice State 2 8 80 0 spare rebuilding /dev/sdf 1 8 32 1 active sync /dev/sdc 關閉陣列設備 Raid5 [rootlinux /] mdadm C /dev/md5 level=5 raiddevices=4 /dev/sdc11 /dev/sdc12 /dev/sdc13 /dev/sdc14 mdadm: /dev/sdc11 appears to contain an ext2fs file system size=312960K mtime=Sun Feb 24 00:09:49 2020 mdadm: /dev/sdc11 appears to be part of a raid array: level=raid5 devices=4 ctime=Sun Feb 24 00:07:59 2020 mdadm: /dev/sdc12 appears to be part of a raid array: level=raid5 devices=4 ctime=Sun Feb 24 00:07:59 2020 mdadm: /dev/sdc13 appears to be part of a raid array: level=raid5 devices=4 ctime=Sun Feb 24 00:07:59 2020 mdadm: /dev/sdc14 appears to contain an ext2fs file system size=312896K mtime=Sun Feb 24 00:09:49 2020 mdadm: /dev/sdc14 appears to be part of a raid array: level=raid5 devices=4 ctime=Sun Feb 24 00:07:59 2020 Continue creating array? y mdadm: array /dev/md5 started. [rootlinux /] mdadm S /dev/md5 mdadm: stopped /dev/md5 方式二指定 spare設備的數(shù)量 30 [rootlinux /] mdadm C /dev/md5 level=5 raiddevices=4 sparedevices=1 /dev/sdc11 /dev/sdc12 /dev/sdc13 /dev/sdc14 /dev/sdc15 mdadm: /dev/sdc11 appears to contain an ext2fs file system size=312960K mtime=Sun Feb 24 00:09:49 2020 mdadm: /dev/sdc11 appears to be part of a raid array: level=raid5 devices=4 ctime=Sun Feb 24 00:20:33 2020 mdadm: /dev/sdc12 appears to be part of a raid array: level=raid5 devices=4 ctime=Sun Feb 24 00:20:33 2020 mdadm: /dev/sdc13 appears to be part of a raid array: level=raid5 devices=4 ctime=Sun Feb 24 00:20:33 2020 mdadm: /dev/sdc14 appears to contain an ext2fs file system size=312896K mtime=Sun Feb 24 00:09:49 2020 mdadm: /dev/sdc14 appears to be part of a raid array: level=raid5 devices=4 ctime=Sun Feb 24 00:20:33 2020 mdadm: /dev/sdc15 appears to contain an ext2fs file system size=312960K mtime=Sun Feb 24 00:09:49 2020 mdadm: /dev/sdc15 appears to be part of a raid array: level=raid5 devices=4 ctime=Sun Feb 24 00:07:59 2020 mdadm: largest drive (/dev/sdc15) exceed size (104320K) by more than 1% Continue creating array? y mdadm: array /dev/md5 started. 結果查看 [rootlinux dev] mdadm detail /dev/md5 /dev/md5: Version : Creation Time : Sun Feb 24 00:21:02 2020 Raid Level : raid5 Array Size : 312960 ( MiB MB) Used Dev Size : 104320 ( MiB MB) Raid Device。只有 raid1以后的磁盤陣列由于本身并不是把所 有的磁盤都納入實際使用，故可以實現(xiàn)磁盤（數(shù)據(jù)）的容錯。故障后重建信息的時間比鏡像配置情況下要長。優(yōu)勢：更高的容錯能力，具備更快數(shù)據(jù)讀取速率的潛力。 RAID50 具備更高的容錯能力，因為它允許某個組內(nèi)有一個磁盤出現(xiàn)故障，而不會造成數(shù)