Linux Disk Management

Source: Internet
Author: User
Tags uuid


Linux Create disk and disk partition management


View disk Information

[Email protected] ~]# fdisk-l


disk/dev/sda:42.9 GB, 42949672960 bytes, 83886080 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes

Disk label Type:dos

Disk identifier:0x000af460


Device Boot Start End Blocks Id System

/DEV/SDA1 * 2048 1026047 512000 Linux

/dev/sda2 1026048 83886079 41430016 8e Linux LVM


disk/dev/mapper/centos_zzsrv1-swap:2181 MB, 2181038080 bytes, 4259840 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes



disk/dev/mapper/centos_zzsrv1-root:40.2 GB, 40240152576 bytes, 78594048 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes



Rescan disks after adding a piece of disk does not require a restart


[Email protected] ~]# echo "---" >/sys/class/scsi_host/host0/scan

[Email protected] ~]# echo "---" >/sys/class/scsi_host/host1/scan

[Email protected] ~]# echo "---" >/sys/class/scsi_host/host2/scan


[[email protected] ~]# fdisk-l to view the disk information again, you will see the newly added disk SDB


disk/dev/sda:42.9 GB, 42949672960 bytes, 83886080 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes

Disk label Type:dos

Disk identifier:0x000af460


Device Boot Start End Blocks Id System

/DEV/SDA1 * 2048 1026047 512000 Linux

/dev/sda2 1026048 83886079 41430016 8e Linux LVM


disk/dev/mapper/centos_zzsrv1-swap:2181 MB, 2181038080 bytes, 4259840 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes



disk/dev/mapper/centos_zzsrv1-root:40.2 GB, 40240152576 bytes, 78594048 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes



disk/dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes


Partition the disk (this is where the disk is divided into a zone)


[Email protected] ~]# Fdisk/dev/sdb

Welcome to Fdisk (Util-linux 2.23.2).


Changes'll remain in memory only, until the decide to write them.

Be careful before using the Write command.


Device does not contain a recognized partition table

Building a new DOS disklabel with disk identifier 0X7D9737A7.


Command (M for help): N

Partition Type:

P Primary (0 primary, 0 extended, 4 free)

E Extended

Select (default p): P

Partition number (1-4, default 1): → Here are some areas where you can divide the disk

First sector (2048-41943039, default 2048):

Using Default Value 2048

Last sector, +sectors or +size{k,m,g} (2048-41943039, default 41943039): → the size of the partition cannot exceed the size of the disk

Using Default Value 41943039

Partition 1 of type Linux and of size GiB is set


Command (M for help): P


disk/dev/sdb:21.5 GB, 21474836480 bytes, 41943040 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes

Disk label Type:dos

Disk Identifier:0x7d9737a7


Device Boot Start End Blocks Id System

/DEV/SDB1 2048 41943039 20970496-up Linux


Command (M for help): W

The partition table has been altered!


Calling IOCTL () to re-read partition table.

Syncing disks.



Create PV

[Email protected] ~]# Pvscan

Pv/dev/sda2 VG centos_zzsrv1 lvm2 [39.51 gib/0 Free]

Total:1 [39.51 Gib]/in use:1 [39.51 GIB]/in no vg:0 [0]

[Email protected] ~]# PVCREATE/DEV/SDB1

Physical volume "/DEV/SDB1" successfully created

[Email protected] ~]# Pvscan

Pv/dev/sda2 VG centos_zzsrv1 lvm2 [39.51 gib/0 Free]

PV/DEV/SDB1 lvm2 [20.00 GiB]

Total:2 [59.51 GIB]/in use:1 [39.51 GIB]/In no vg:1 [20.00 GIB]


Create VG


[Email protected] ~]# Vgscan

Reading all physical volumes. This is a while ...

Found Volume Group "CENTOS_ZZSRV1" using metadata type LVM2

[Email protected] ~]# vgcreate VG/DEV/SDB1

Volume Group "VG" successfully created

[Email protected] ~]# Vgscan

Reading all physical volumes. This is a while ...

Found Volume Group "VG" using metadata type LVM2

Found Volume Group "CENTOS_ZZSRV1" using metadata type LVM2


[Email protected] ~]# Vgdisplay VG

---Volume Group---

VG Name VG

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 1

VG Access Read/write

VG Status resizable

MAX LV 0

Cur LV 0

Open LV 0

Max PV 0

Cur PV 1

ACT PV 1

VG Size 20.00 GiB

PE Size 4.00 MiB

Total PE 5119 → remember this number.

Alloc pe/size 0/0

Free Pe/size 5119/20.00 GiB

VG UUID QHPCWT-MJRD-XCST-QBAC-XM94-B1H4-P2NQDF



Create a LV, using all of the VG's PE


[Email protected] ~]# Lvscan

ACTIVE '/dev/centos_zzsrv1/swap ' [2.03 GiB] Inherit

ACTIVE '/dev/centos_zzsrv1/root ' [37.48 GiB] Inherit


The name of the LV is LV1

[Email protected] ~]# lvcreate-n lv1-l 5119 VG

Logical volume "LV1" created


[Email protected] ~]# Lvscan

ACTIVE '/dev/vg/lv1 ' [20.00 GiB] Inherit

ACTIVE '/dev/centos_zzsrv1/swap ' [2.03 GiB] Inherit

ACTIVE '/dev/centos_zzsrv1/root ' [37.48 GiB] Inherit

[Email protected] ~]# LVDISPLAY/DEV/VG/LV1

---Logical volume---

LV PATH/DEV/VG/LV1

LV Name LV1

VG Name VG

LV UUID 2OHUKM-6WYJ-7TFR-LJCT-ZFZH-OCKD-F6OLR8

LV Write Access Read/write

LV Creation Host, Time Zzsrv2.localdomain, 2014-08-20 10:31:10 +0800

LV Status Available

# Open 0

LV Size 20.00 GiB

Current LE 5119

Segments 1

Allocation inherit

Read ahead Sectors Auto

-Currently set to 8192

Block Device 253:2


[Email protected] ~]# Vgdisplay VG

---Volume Group---

VG Name VG

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 2

VG Access Read/write

VG Status resizable

MAX LV 0

Cur LV 1

Open LV 0

Max PV 0

Cur PV 1

ACT PV 1

VG Size 20.00 GiB

PE Size 4.00 MiB

Total PE 5119

Alloc pe/size 5119/20.00 GiB

Free pe/size 0/0 → Note here, there is no space left, indicating that all the space has been used

VG UUID QHPCWT-MJRD-XCST-QBAC-XM94-B1H4-P2NQDF


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