RAID 5+1
11103 ワード
RAID 5+バックアップディスク
[root@linuxprobe ~]# mdadm -Cv /dev/md0 -n 3 -l 5 -x 1 /dev/sdb /dev/sdc /dev/sdf /dev/sdg
mdadm: layout defaults to left-symmetric
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 512K
mdadm: size set to 20954624K
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
[root@linuxprobe ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Thu Jan 16 20:56:10 2020
Raid Level : raid5
Array Size : 41909248 (39.97 GiB 42.92 GB)
Used Dev Size : 20954624 (19.98 GiB 21.46 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Thu Jan 16 20:57:56 2020
State : clean, degraded, recovering
Active Devices : 2
Working Devices : 4
Failed Devices : 0
Spare Devices : 2
Layout : left-symmetric
Chunk Size : 512K
Rebuild Status : 23% complete
Name : linuxprobe:0 (local to host linuxprobe)
UUID : 7a86eb15:2da27ed6:af887a2f:29a3cac5
Events : 4
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
1 8 32 1 active sync /dev/sdc
4 8 80 2 spare rebuilding /dev/sdf
3 8 96 - spare /dev/sdg
[root@linuxprobe ~]# mkfs.ext4 /dev/md0
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=128 blocks, Stripe width=256 blocks
2621440 inodes, 10477312 blocks
523865 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2157969408
320 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
[root@linuxprobe ~]# echo "/dev/md0 /RAID5 ext4 defaults 0 0" >> /etc/fstab
[root@linuxprobe ~]# mkdir /RAID5
[root@linuxprobe ~]# mount -a
[root@linuxprobe ~]# mdadm /dev/md0 -f /dev/sdb
mdadm: set /dev/sdb faulty in /dev/md0
[root@linuxprobe ~]# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Thu Jan 16 20:56:10 2020
Raid Level : raid5
Array Size : 41909248 (39.97 GiB 42.92 GB)
Used Dev Size : 20954624 (19.98 GiB 21.46 GB)
Raid Devices : 3
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Thu Jan 16 21:09:43 2020
State : clean, degraded, recovering
Active Devices : 2
Working Devices : 3
Failed Devices : 1
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Rebuild Status : 1% complete
Name : linuxprobe:0 (local to host linuxprobe)
UUID : 7a86eb15:2da27ed6:af887a2f:29a3cac5
Events : 114
Number Major Minor RaidDevice State
3 8 96 0 spare rebuilding /dev/sdg
1 8 32 1 active sync /dev/sdc
4 8 80 2 active sync /dev/sdf
0 8 16 - faulty /dev/sdb