[root@RHEL7 ~]# date

Fri Aug 19 21:55:01 CST 2016

準(zhǔn)備3個盤

[root@RHEL7 ~]# fdisk /dev/sdb

[root@RHEL7 ~]# fdisk /dev/sdc

[root@RHEL7 ~]# fdisk /dev/sdd

[root@RHEL7 ~]# mdadm -C -v /dev/md5 -l 5 -n 3? /dev/sdb1 /dev/sdc1 /dev/sdd1

mdadm: layout defaults to left-symmetric

mdadm: layout defaults to left-symmetric

mdadm: chunk size defaults to 512K

mdadm: /dev/sdc appears to be part of a raid array:

level=raid0 devices=0 ctime=Thu Jan? 1 08:00:00 1970

mdadm: partition table exists on /dev/sdc but will be lost or

meaningless after creating array

mdadm: size set to 5237248K

Continue creating array? y

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md5 started.

[root@RHEL7 ~]# mdadm -C -v /dev/md5 -l 5 -n 3 -x 1 /dev/sdb1 /dev/sdc1 /dev/sdd1

-x 指定熱備盤數(shù)量

[root@RHEL7 ~]# mdadm -D /dev/md5

/dev/md5:

Version : 1.2

Creation Time : Fri Aug 19 21:06:32 2016

Raid Level : raid5

Array Size : 10474496 (9.99 GiB 10.73 GB)

Used Dev Size : 5237248 (4.99 GiB 5.36 GB)

Raid Devices : 3

Total Devices : 3

Persistence : Superblock is persistent

Update Time : Fri Aug 19 21:06:59 2016

State : clean

Active Devices : 3

Working Devices : 3

Failed Devices : 0

Spare Devices : 0

Layout : left-symmetric

Chunk Size : 512K

Name : RHEL7.2:5? (local to host RHEL7.2)

UUID : 34f81bee:05f28fb2:a45ff119:930b98cc

Events : 18

Number? ?Major? ?Minor? ?RaidDevice State

0? ? ? ?8? ? ? ?17? ? ? ? 0? ? ? active sync? ?/dev/sdb1

1? ? ? ?8? ? ? ?32? ? ? ? 1? ? ? active sync? ?/dev/sdc1

3? ? ? ?8? ? ? ?49? ? ? ? 2? ? ? active sync? ?/dev/sdd1

創(chuàng)建配置文件

[root@RHEL7 raid5]# mdadm -Dsv

ARRAY /dev/md5 level=raid5 num-devices=3 metadata=1.2 name=RHEL7.2:5 UUID=34f81bee:05f28fb2:a45ff119:930b98cc

devices=/dev/sdb1,/dev/sdc,/dev/sdd1

[root@RHEL7 raid5]# mdadm -Dsv >> /etc/mdadm.conf

[root@RHEL7 ~]# mkfs -t xfs /dev/md5

log stripe unit (524288 bytes) is too large (maximum is 256KiB)

log stripe unit adjusted to 32KiB

meta-data=/dev/md5? ? ? ? ? ? ? ?isize=256? ? agcount=16, agsize=163712 blks

=? ? ? ? ? ? ? ? ? ? ? ?sectsz=512? ?attr=2, projid32bit=1

=? ? ? ? ? ? ? ? ? ? ? ?crc=0

data? ? ?=? ? ? ? ? ? ? ? ? ? ? ?bsize=4096? ?blocks=2618624, imaxpct=25

=? ? ? ? ? ? ? ? ? ? ? ?sunit=128? ? swidth=256 blks

naming? ?=version 2? ? ? ? ? ? ? bsize=4096? ?ascii-ci=0 ftype=0

log? ? ? =internal log? ? ? ? ? ?bsize=4096? ?blocks=2560, version=2

=? ? ? ? ? ? ? ? ? ? ? ?sectsz=512? ?sunit=8 blks, lazy-count=1

realtime =none? ? ? ? ? ? ? ? ? ?extsz=4096? ?blocks=0, rtextents=0

創(chuàng)建文件系統(tǒng)掛載測試

[root@RHEL7 ~]# mkdir /raid5

[root@RHEL7 ~]# mount /dev/md5 /raid5/

[root@RHEL7 ~]# mount /dev/md5 /raid5/

[root@RHEL7 ~]# cd /raid5/

[root@RHEL7 raid5]# ls

[root@RHEL7 raid5]# dd if=/dev/zero of=aa bs=2M count=200

200+0 records in

200+0 records out

419430400 bytes (419 MB) copied, 4.18005 s, 100 MB/s

[root@RHEL7 raid5]# df /raid5

Filesystem? ? ?1K-blocks? ?Used Available Use% Mounted on

/dev/md5? ? ? ? 10464256 442912? 10021344? ?5% /raid5

[root@RHEL7 raid5]# du /raid5

409600? ? /raid5

開機(jī)自動掛載

[root@RHEL7 raid5]# echo "/dev/md5 /raid5 xfs defaults 0 0" >> /etc/fstab

[root@RHEL7 raid5]# tail -1 /etc/fstab

/dev/md5 /raid5 xfs defaults 0 0

清除磁盤信息再添加到RAID里去

[root@RHEL7 ~]# umount /dev/md5

[root@RHEL7 ~]# mdadm -S /dev/md5

mdadm: stopped /dev/md5

[root@RHEL7 ~]# mdadm --zero-superblock /dev/sdb1

[root@RHEL7 ~]# mdadm /dev/md5 --add /dev/sdb1

[root@RHEL7 ~]# mdadm -As

mdadm: /dev/md5 assembled from 1 drive - not enough to start the array.

[root@RHEL7 ~]#刪除配置文件后清除RAID

[root@RHEL7 ~]# mdadm -rf /etc/mdadm.conf

RAID10:兩種方法，

四塊盤直接做RAID10,,第二種先做RAID1，再做RAID0

[root@RHEL7 ~]# mdadm -C -v /dev/md10 -l 10 -n 4 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1

mdadm: layout defaults to n2

mdadm: layout defaults to n2

mdadm: chunk size defaults to 512K

mdadm: size set to 3142144K

mdadm: Defaulting to version 1.2 metadata

mdadm: array /dev/md10 started.

[root@RHEL7 ~]# cat /dev/md10

^C[root@RHEL7 ~]# cat /proc/mdstat

Personalities : [raid10]

md10 : active raid10 sde1[3] sdd1[2] sdc1[1] sdb1[0]

6284288 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]

unused devices:

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