还是准备三块硬盘，分别为20G
创建raid1
[root@oracletest ~]# mdadm --create /dev/md/raid1 --level=1 --raid-devices=2 /dev/nvme0n2 /dev/nvme0n3
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md/raid1 started.查看raid信息
[root@oracletest ~]# mdadm --detail /dev/md/raid1
/dev/md/raid1:
Version : 1.2
Creation Time : Wed Jul 30 12:05:54 2025
Raid Level : raid1
Array Size : 20954112 (19.98 GiB 21.46 GB)
Used Dev Size : 20954112 (19.98 GiB 21.46 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Wed Jul 30 12:06:27 2025
State : clean, resyncing
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : resync
Resync Status : 35% complete
Name : oracletest:raid1 (local to host oracletest)
UUID : 2e06ea2e:56f77441:70f095b5:a0fef6e0
Events : 5
Number Major Minor RaidDevice State
0 259 3 0 active sync /dev/nvme0n2
1 259 4 1 active sync /dev/nvme0n3删除raid1
[root@oracletest ~]# mdadm -S /dev/md/raid1
mdadm: stopped /dev/md/raid1
[root@oracletest ~]# mdadm --zero-superblock /dev/nvme0n2 /dev/nvme0n3创建raid0
[root@oracletest ~]# mdadm --create /dev/md/raid0 --level=0 --raid-devices=3 /dev/nvme0n2 /dev/nvme0n3 /dev/nvme0n4
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md/raid0 started.查看raid信息
[root@oracletest ~]# mdadm --detail /dev/md/raid0
/dev/md/raid0:
Version : 1.2
Creation Time : Wed Jul 30 12:11:04 2025
Raid Level : raid0
Array Size : 62862336 (59.95 GiB 64.37 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Wed Jul 30 12:11:04 2025
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : -unknown-
Chunk Size : 512K
Consistency Policy : none
Name : oracletest:raid0 (local to host oracletest)
UUID : e49d31f0:e891eb71:5c281fca:ffde3bc7
Events : 0
Number Major Minor RaidDevice State
0 259 3 0 active sync /dev/nvme0n2
1 259 4 1 active sync /dev/nvme0n3
2 259 5 2 active sync /dev/nvme0n4删除raid0
[root@oracletest ~]# mdadm -S /dev/md/raid1
[root@oracletest ~]# mdadm --zero-superblock /dev/nvme0n2 /dev/nvme0n3 /dev/nvme0n4 创建raid5
[root@oracletest ~]# mdadm --create /dev/md/raid5 --level=5 --raid-devices=3 /dev/nvme0n2 /dev/nvme0n3 /dev/nvme0n4
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md/raid5 started.
[root@oracletest ~]# mdadm --detail /dev/md/raid5
/dev/md/raid5:
Version : 1.2
Creation Time : Wed Jul 30 12:16:06 2025
Raid Level : raid5
Array Size : 41908224 (39.97 GiB 42.91 GB)
Used Dev Size : 20954112 (19.98 GiB 21.46 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Wed Jul 30 12:16:13 2025
State : clean, degraded, recovering
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : resync
Rebuild Status : 6% complete
Name : oracletest:raid5 (local to host oracletest)
UUID : 8b158f48:03d6f076:202d876f:5e8a9a3e
Events : 2
Number Major Minor RaidDevice State
0 259 3 0 active sync /dev/nvme0n2
1 259 4 1 active sync /dev/nvme0n3
3 259 5 2 spare rebuilding /dev/nvme0n4挂载raid卷
[root@oracletest ~]# mkfs.xfs /dev/md/raid5
log stripe unit (524288 bytes) is too large (maximum is 256KiB)
log stripe unit adjusted to 32KiB
meta-data=/dev/md/raid5 isize=512 agcount=16, agsize=654720 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1 bigtime=0 inobtcount=0
data = bsize=4096 blocks=10475520, imaxpct=25
= sunit=128 swidth=256 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=5120, version=2
= sectsz=512 sunit=8 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@oracletest ~]# mount /dev/md/raid5 /mnt/
[root@oracletest ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
devtmpfs 7.7G 0 7.7G 0% /dev
tmpfs 7.7G 0 7.7G 0% /dev/shm
tmpfs 7.7G 8.8M 7.7G 1% /run
tmpfs 7.7G 0 7.7G 0% /sys/fs/cgroup
/dev/mapper/ol-root 92G 4.7G 87G 6% /
/dev/nvme0n1p1 1014M 284M 731M 28% /boot
tmpfs 1.6G 0 1.6G 0% /run/user/0
/dev/md127 40G 319M 40G 1% /mnt分区并挂载
[root@oracletest ~]# parted /dev/md/raid5
GNU Parted 3.2
使用 /dev/md/raid5
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) mklabel
新的磁盘标签类型？ gpt
警告: The existing disk label on /dev/md/raid5 will be destroyed and all data on this disk will be lost. Do you want to continue?
是/Yes/否/No? yes
(parted) print
Model: Linux Software RAID Array (md)
Disk /dev/md/raid5: 42.9GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name 标志
(parted) mkpart
分区名称？ []? 1
文件系统类型？ [ext2]? xfs
起始点？ 1
结束点？ 42G
(parted) print
Model: Linux Software RAID Array (md)
Disk /dev/md/raid5: 42.9GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name 标志
1 1049kB 42.0GB 42.0GB xfs 1[root@oracletest ~]# mkfs.xfs /dev/md/raid5p1
log stripe unit (524288 bytes) is too large (maximum is 256KiB)
log stripe unit adjusted to 32KiB
meta-data=/dev/md/raid5p1 isize=512 agcount=16, agsize=640896 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1 bigtime=0 inobtcount=0
data = bsize=4096 blocks=10253568, imaxpct=25
= sunit=128 swidth=256 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=5008, version=2
= sectsz=512 sunit=8 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@oracletest ~]# mount /dev/md/raid5p1 /mnt写进fatab
[root@oracletest ~]# cat /etc/fstab
/dev/mapper/ol-root / xfs defaults 0 0
UUID=eb870bbd-bb99-43eb-b05a-a2dc051a4338 /boot xfs defaults 0 0
/dev/mapper/ol-swap none swap defaults 0 0
/dev/md/raid5p1 /data xfs defaults 0 0