First, create RAID5 volume (soft RAID)
1, the newly added hard disk use a command can be scanned out to use
2. Disk Partitioning
Enter p to print out the partition as follows. (then finish typing w save exit fdisk partition Tool)
If the partition is complete without the device file/dev/sdb*, you can run the following command
3. Create a RAID5 volume
4. Mdadm Common Commands
5. Auto-Assemble RAID configuration
6. Format and set the boot automatically mount raid
7, the method of related information inquiry
View RAID Status
viewing partition information
8. After restarting Linux, the status should be like this
Input: mdadm-d/dev/md1 View
Df-th
Ii. Creating an LVM volume
1. Use FDISK to partition
Enter p to print the current partition, end still use W save to exit
2. Create the LVM process. (two LVM volumes are created, respectively, using the-l specified size and-L Specify the number of PE to create; When creating a VG, you can specify a single PE size with the-s option, without specifying a default of 4M)
3. View status
Volume Group Vgroup Status
Logical Volume Lvone Status
Logical Volume Lvtwo Status
4, format and automatic mount (execution mount-a will load the configuration in/etc/fstab, if there is no output, indicating that the mount is complete)
5, LV added capacity
Now my volume group has room, so you can add capacity directly to the LV (note that the difference between +16m and 16M is that if you write +16m, you add 16M; If you write 16M to increase to 16M)
If I need to increase the logical volume (LV) capacity by 100M Now, the volume group (VG) capacity is not enough; You can add a new physical volume (PV) to the volume group (VG).
Note: The lvtwo volume of the XFS file system, although it has increased capacity, does not directly mount the point/xiaoshou does not increase capacity. Such as
6. Since LVM supports increased capacity, it also supports reduced capacity; in production environments, reduced capacity is seldom used, only to understand.
Reduce the lvone of the Ext4 file system.
Note that lvtwo under the XFS file system does not support scaling.
7, LVM snapshot function.
Create an LVM volume using SSM and format it to mount under/test
Back up/etc/paswd in the/test directory
Create a snapshot of the moment, which can be viewed through lvscan. (The snapshot is also an LVM volume, which also takes up disk space)
The simulated backup file was mistakenly deleted
Lifting the Mount
Restore data from a/dev/vg_test/lv_test volume with a snapshot (the snapshot disappears when it is restored)
Re-mount, you can see the deleted backup files are recovered
Linux Disk Management-raid5 and LVM
