/dev/sdb 500GB
/dev/sdc 500GB
1.mdadm 설치
yum -y install mdadm
apt -y install mdadm
2.대상 디스크 파티션 삭제
dd if=/dev/zero of=/dev/sdb bs=1024 count=1
dd if=/dev/zero of=/dev/sdc bs=1024 count=1
3.RAID 타입으로 파티셔닝
# fdisk /dev/sdb (같은 방법으로 sdc도 파티셔닝)
Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x5e7f68d2.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-976773167, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-976773167, default 976773167):
Created a new partition 1 of type 'Linux' and of size 465.8 GiB.
Partition #1 contains a ext4 signature.
Do you want to remove the signature? [Y]es/[N]o: Y
The signature will be removed by a write command.
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): fd
Changed type of partition 'Linux' to 'Linux raid autodetect'.
Command (m for help): p
Disk /dev/sdb: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5e7f68d2
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 976773167 976771120 465.8G fd Linux raid autodetect
Filesystem/RAID signature on partition 1 will be wiped.
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
4.변경사항 확인
# mdadm -E /dev/sd[b-c]
/dev/sdb:
MBR Magic : aa55
Partition[0] : 976771120 sectors at 2048 (type fd)
/dev/sdc:
MBR Magic : aa55
Partition[0] : 976771120 sectors at 2048 (type fd)
# mdadm -E /dev/sd[b-c]1
mdadm: No md superblock detected on /dev/sdb1.
mdadm: No md superblock detected on /dev/sdc1.
5.RAID 장치 생성
# mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sdb1 /dev/sdc1
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/md0 started.
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[1] sdb1[0]
488253440 blocks super 1.2 [2/2] [UU]
[>....................] resync = 0.1% (605696/488253440) finish=107.3min speed=75712K/sec
bitmap: 4/4 pages [16KB], 65536KB chunk
unused devices: <none>
6.RAID 장치 생성 확인
# mdadm -E /dev/sd[b-c]1
/dev/sdb1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 0fe62843:e7d9d0e8:56b5b49a:69682d79
Name : db:0 (local to host db)
Creation Time : Sat Jun 1 04:09:43 2024
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 976506928 sectors (465.63 GiB 499.97 GB)
Array Size : 488253440 KiB (465.63 GiB 499.97 GB)
Used Dev Size : 976506880 sectors (465.63 GiB 499.97 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=48 sectors
State : active
Device UUID : 2fe4cb6b:c2be29d8:96db5e70:ce4628fa
Internal Bitmap : 8 sectors from superblock
Update Time : Sat Jun 1 04:10:48 2024
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : 8e9ac22 - correct
Events : 13
Device Role : Active device 0
Array State : AA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdc1:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 0fe62843:e7d9d0e8:56b5b49a:69682d79
Name : db:0 (local to host db)
Creation Time : Sat Jun 1 04:09:43 2024
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 976506928 sectors (465.63 GiB 499.97 GB)
Array Size : 488253440 KiB (465.63 GiB 499.97 GB)
Used Dev Size : 976506880 sectors (465.63 GiB 499.97 GB)
Data Offset : 264192 sectors
Super Offset : 8 sectors
Unused Space : before=264112 sectors, after=48 sectors
State : active
Device UUID : bb646c05:8a3ebe24:2b3cfce6:c92a7010
Internal Bitmap : 8 sectors from superblock
Update Time : Sat Jun 1 04:10:48 2024
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : 7c03f105 - correct
Events : 13
Device Role : Active device 1
Array State : AA ('A' == active, '.' == missing, 'R' == replacing)
자세하게 상태 체크
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sat Jun 1 04:09:43 2024
Raid Level : raid1
Array Size : 488253440 (465.63 GiB 499.97 GB)
Used Dev Size : 488253440 (465.63 GiB 499.97 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Sat Jun 1 04:11:08 2024
State : clean, resyncing
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : bitmap
Resync Status : 1% complete
Name : db:0 (local to host db)
UUID : 0fe62843:e7d9d0e8:56b5b49a:69682d79
Events : 17
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
간단하게 상태 체크
# mdadm --query /dev/md0
7. 디스크 포맷
# mkfs -t ext4 /dev/md0
8.fstab 추가
# vi /etc/fstab
/dev/md0 /mnt/md0 ext4 defaults 1 2
9. RAID 시작과 중지
mdadm --run /dev/md0
mdadm --stop /dev/md0