Linux Configuration RAID5 hot standby

case: Building a soft RAID disk array

Requirements Description

add to Linux server 5 Block SCSI hard disk

Use the Mdadm software package to build RAID5 + Hot Spares array for improved performance and reliability of disk storage

⑴ installation Mdadm

[Email protected] ~]# Rpm-qa |grep mdadm

⑵ preparing partitions for a RAID array

① add 5 SCSI hard disks to the Linux server and use the Fdisk tool to carve out a 2GB partition:/DEV/SDB1,/DEV/SDC1,/dev/sdd1,/dev/sde1,/DEV/SDF1

② change its type ID to "FD", which corresponds to "Linux raid AutoDetect", which indicates support for RAID disk array

[[email protected] ~]# fdisk/dev/sdb# partition the second hard drive

[Email protected] ~]# FDISK/DEV/SDC #对第三块硬盘进行分区

[Email protected] ~]# FDISK/DEV/SDD #对第四块硬盘进行分区

[Email protected] ~]# FDISK/DEV/SDE #对第五块硬盘进行分区

[Email protected] ~]# FDISK/DEV/SDF #对第六块硬盘进行分区 #依次都是按照这种形式去分

⑶ Creating a RAID device

[Email protected] ~]# Mdadm-cv/dev/md0-l5-n3/dev/sd[bcd]1-x1/dev/sde1

C:Create creates

V: Show details during creation

/dev/md0:name of RAID, starting with MD

-A Yes: automatically create device files, activate device files

-n4: create raid with a few hard drives

-L5:RAID level

- x: Specify the number of free disks (hot spare disk), the free disk (hot spare disk) can be automatically replaced after the work disk damage;-x1/dev/sde1 specifies which partition to use as the hot standby

sd[bcd]1 : What disk partitions are used to create

[Email protected] ~]# Cat/proc/mdstat #查看磁盘阵列的状态

⑷ Formatting RAID devices

[Email protected] ~]# mkfs.ext4/dev/md0

⑸ Mount

[Email protected] ~]# mkdir/mnt/md0

[Email protected] ~]# Vim/etc/fstab

[Email protected] ~]# mount-a

[Email protected] ~]# df-h

⑹ Analog Array Device failure

[Email protected] ~]# mdadm/dev/md0-f/DEV/SDB1

[Email protected] ~]# Cat/proc/mdstat #查看阵列状态

[Email protected] ~]# mdadm/dev/md0-r/dev/sdb1 #移除损坏硬盘

⑺ add another hard drive as a hot standby machine

[Email protected] ~]# mdadm/dev/md0--ADD/DEV/SDF1

[Email protected] ~]# mdadm-dvs/dev/md0 #查看阵列详细信息

Linux configuration RAID5 hot standby