Redhat system raid and lvm usage knowledge

Raid is a tool installed by default using raidtools. add hard disk raid members as hard disk partitions first to hard disk partitions 2. install raidtools3. process modification script raidstop/dev/md0cp/usr/share/doc/raidtools-1.00.3/raid1.conf. sample/etc/raditabviraiddev

Raid is a tool installed by default using raidtools.

 

1. add a hard disk
Raid members are hard disk partitions
Partitioning hard disks first

2. install raidtools

3.

Process

Modify script

Raidstop/Dev/md0

Cp/usr/share/doc/raidtools-1.00.3/raid1.conf. sample/Etc/raditab

Vi

Raiddev /Dev/md1, name
Raid-level 1       
Nr-raid-disks2    Raid disk count
Nr-spare-disks0   Number of redundant disks
Chunk-size     4

Device   /Dev/sdb1
Raid-disk (raid disk)   0                        

Device/Dev/sdc1
Raid-disk  1

Device/Dev/sdc1
Spare-disks (redundant disk) 1

Mkraid-R/dev/md1
Mkfs. ext3/dev/md1
Mount/dev/md1/opt
Write vi/etc/fstab
/Dev/md0 /Opt

 

Lsraid-A-a/dev/md1

, More/proc/mdstat
Port the raid device to the root directory
Required
/Etc/grub. conf add raid device kernel

Simulated recovery
Raidsetfaulty/dev/md0/dev/sdb1

Raidhotadd/dev/md0/dev/sdd1 add hard disk

Raidhotremove/dev/md0/dev/sdb1 remove hard disk

Step Auto-restore
1.
Raidstop/dev/md0
2.
Vi/etc/raidtab to add redundant disk configuration files
Device/Dev/sdc1
Spare-disks (redundant disk) 1
3.
/Proc/mdstat
Disk information kernel
View repair progress
4.

Run raid0 first and run raid1.
After completion
Format raid1 only
You can.
Then you can mount it.

 

Lvm Logical Volume Management

Pvcreate/dev/sda1/dev/sda2/dev/sda3 add logical volume space

Pv (phisical volume) physical volume

Vg (vounme group)Logical group

Lv (logical volume) logical volume

Vgcreate vg0/dev/sda1/dev/sda2 create a logical volume Group

Lvcreate-n data (name)-L 10 m (size) vg0 add logical volume

Ese2fsadm-L + 10 m/dev/vg0/data adds space for the logical volume

Vgextend vg0/dev/sda3 logical volume group enlargement

Pvmove/dev/sda1 [/dev/sdb1]

Convert a file system to a pv linux lvm
 
Fdisk/dev/sdb
Linux lvm

Pvcreate/dev/sda [1-3]

Vgcreate-s size (pe block size) vg0/dev/sda1/dev/sda2
Vgdisplay vg0 view information
Lvcreate-n data (name)-L 10 m (size)
Lvcreate-d-l 8-n snap (snapshot) objective
Vgchange-an {close}-ay (enable) vg0