A summary of LVM learning

LVM full: Logical Volume Manager Logical Volume Manager. The practice of LVM is to combine several physical partitions (or disks) into a single, large disk, or VG, by means of a software method. The disk is then divided into the partition (LV) that can be used, and the last mount is used.

First introduce a few nouns:

1.physicalextend,pe Physical Expansion Fast:EstablishVGthe time specified by theBlockblock Size, default is4MB. AVGMaximum allowable65534aPE

    2.PHYSICALVOLUME,PV Physical Volume: Is Physical disk, similar to /dev/ SDA1 et cetera, by pe Physical disk blocks, multiple PV can be combined to form a Span lang= "en-US" style= "Font-size:10.5pt;background-color: #FFFFFF; line-height:21pt;" xml:lang= "en-us" >vg. Note: Use the FDISK command to adjust the system identifier of the partition to 8e.

3.Volume GROUP,VG Volume user group: A group of multiple physical volumes that cannot be used directly; you need to create a logical volume to use the combined space;thevg size depends on the physical volume,VG can be divided into multiple logical volumes (can be dynamically indented)

4.Logical volume,lv Logical Volume: Can be the VG all available space, there are two boundaries, one is a physical boundary, one is a logical boundary; it can be said that each logical volume is a filesystem, or a separate partition. A snapshot volume is in the same volume group as its logical volume.

For the LVM hierarchy:

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/72/AD/wKiom1XrBSzD_g3tAABqEJIf8D4809.jpg "title=" Qq20150905230639.png "alt=" Wkiom1xrbszd_g3taabqejif8d4809.jpg "/>

LVM Authoring Process:

Use 3 partitions, SDA3,SDA5,SDA6

First use 3,5 to do PV

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/AD/wKiom1XrBgPTU7iwAAC_ZY3aNiA621.jpg "title=" 1.png " alt= "Wkiom1xrbgptu7iwaac_zy3ania621.jpg"/>

View PV Information

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/72/AD/wKiom1XrBkbTJZ7DAADMZ52dPlg716.jpg "title=" 2.png " alt= "Wkiom1xrbkbtjz7daadmz52dplg716.jpg"/>

Scan PV

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/72/A9/wKioL1XrCKCxOpbmAAETFMgXObA517.jpg "title=" 3.png " alt= "Wkiol1xrckcxopbmaaetfmgxoba517.jpg"/>

Create a volume group MYVG

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/72/A9/wKioL1XrCNjCDG48AAB_jCML98c889.jpg "title=" 4.png " alt= "Wkiol1xrcnjcdg48aab_jcml98c889.jpg"/>

View VG Information

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/A9/wKioL1XrCR6ypjDgAAHD58FSTpk699.jpg "title=" 5.png " alt= "Wkiol1xrcr6ypjdgaahd58fstpk699.jpg"/>

Delete a volume group and create a new volume group, specifying a fast size of 32M

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/72/A9/wKioL1XrCZjyRz2TAAFG4RBlEpM721.jpg "title=" 6.png " alt= "Wkiol1xrczjyrz2taafg4rblepm721.jpg"/>

Verify that the VG you just created, and whether the specified PE size is 32M

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/A9/wKioL1XrCgyRhvTfAAHCCC-c9Ow817.jpg "title=" 7.png " alt= "Wkiol1xrcgyrhvtfaahccc-c9ow817.jpg"/>

To remove PV from a volume group

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/72/AD/wKiom1XrCDuBJxxIAADBtQnH-zo089.jpg "title=" 8.png " alt= "Wkiom1xrcdubjxxiaadbtqnh-zo089.jpg"/>

Looking at the results, we found that the MYVG size became 5g,sda3 was removed from the MYVG

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/72/A9/wKioL1XrCrHwCM7BAAFYn8ST0RM383.jpg "title=" 9.png " alt= "Wkiol1xrcrhwcm7baafyn8st0rm383.jpg"/>

Add a new PV to the MYVG

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/AD/wKiom1XrCMCTbGLBAAJrEbS3pYM456.jpg "title=" 10.png "alt=" Wkiom1xrcmctbglbaajrebs3pym456.jpg "/>

Add the new PV to the VG, resulting in the MYVG size increased from 5G to 13G

Create a logical volume of size 5G mylv and view the logical volume information

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/72/AD/wKiom1XrCULyPfL0AAF16XGOVXY547.jpg "title=" 11.png "alt=" Wkiom1xrculypfl0aaf16xgovxy547.jpg "/>

Formatting logical Volumes

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/A9/wKioL1XrC8mihBcBAAOXUYbkc2Q557.jpg "title=" 12.png "alt=" Wkiol1xrc8mihbcbaaoxuybkc2q557.jpg "/>

Mount the logical volume MYLV to/MNT

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/AD/wKiom1XrCfWR5cZfAAKGvQBWnEk638.jpg "title=" 13.png "alt=" Wkiom1xrcfwr5czfaakgvqbwnek638.jpg "/>

Expands the logical volume, adding 1G. You should extend the physical boundaries before extending the logical boundaries.

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/72/A9/wKioL1XrDGXAy5jnAAOVJnOk1aY425.jpg "title=" 14.png "alt=" Wkiol1xrdgxay5jnaaovjnok1ay425.jpg "/>

Verifying the previous two-step operation

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/72/A9/wKioL1XrDK2RoqEtAAGRe8rPl2A305.jpg "title=" 15.png "alt=" Wkiol1xrdk2roqetaagre8rpl2a305.jpg "/>

Reduce the logical volume. Reduce the logical volume to 3G, force check before shrinking, and unload the device before shrinking

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/AD/wKiom1XrCv7jGBVIAAHEdfyIVg8380.jpg "style=" float: none; "title=" 16.png "alt=" Wkiom1xrcv7jgbviaahedfyivg8380.jpg "/>

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/72/A9/wKioL1XrDSXArDDmAAAxvCV3So8983.jpg "style=" float: none; "title=" 17.png "alt=" Wkiol1xrdsxarddmaaaxvcv3so8983.jpg "/>

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/72/AD/wKiom1XrCv-TYemAAAEKe_wJ9QQ919.jpg "style=" float: none; "title=" 18.png "alt=" Wkiom1xrcv-tyemaaaeke_wj9qq919.jpg "/>

To verify the reduction operation, first /dev/myvg/mylv Mount to /mnt/

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/AD/wKiom1XrCzTTARRtAAG4eIZ13b4722.jpg "title=" 19.png "alt=" Wkiom1xrczttarrtaag4eiz13b4722.jpg "/>

Create a Snapshot

First Copy the/etc/fstab to the /mnt.

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/72/AA/wKioL1XrDa3ydDOzAAA_Hkjo7DU675.jpg "style=" float: none; "title=" 20.png "alt=" Wkiol1xrda3yddozaaa_hkjo7du675.jpg "/>

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/72/AD/wKiom1XrC4fCN-7RAABJi663YUo085.jpg "style=" float: none; "title=" 21.png "alt=" Wkiom1xrc4fcn-7raabji663yuo085.jpg "/>

Create a 100M the snapshot volume, named Mylv-snap

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/AD/wKiom1XrC7ODP-_zAAIGgXSU5tE056.jpg "title=" 22.png "alt=" Wkiom1xrc7odp-_zaaiggxsu5te056.jpg "/>

To mount a snapshot volume under /media/

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/72/AA/wKioL1XrDgbwktCMAADx0-495dg647.jpg "title=" 23.png "alt=" Wkiol1xrdgbwktcmaadx0-495dg647.jpg "/>

Archive The contents of the snapshot volume to /backup under, and verify

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/72/AA/wKioL1XrDi-yRqMHAADQ75KMBAk319.jpg "title=" 24.png "alt=" Wkiol1xrdi-yrqmhaadq75kmbak319.jpg "/>

A summary of LVM learning