码迷,mamicode.com
首页 > 系统相关 > 详细

Linux 磁盘管理

时间:2014-08-20 14:28:02      阅读:288      评论:0      收藏:0      [点我收藏+]

标签:physical   linux   minimum   信息   


Linux 创建磁盘 以及磁盘分区管理


查看磁盘信息

[root@ZZSRV2 ~]# fdisk -l


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

Units = sectors of 1 * 512 = 512 bytes

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

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

Disk label type: dos

Disk identifier: 0x000af460


   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048     1026047      512000   83  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 * 512 = 512 bytes

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

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



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

Units = sectors of 1 * 512 = 512 bytes

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

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



添加一块磁盘后重新扫描磁盘不需要重新启动


[root@ZZSRV2 ~]# echo "- - -" > /sys/class/scsi_host/host0/scan

[root@ZZSRV2 ~]# echo "- - -" > /sys/class/scsi_host/host1/scan

[root@ZZSRV2 ~]# echo "- - -" > /sys/class/scsi_host/host2/scan


[root@ZZSRV2 ~]# fdisk -l 再次查看磁盘信息,最下面就会看到新加的磁盘sdb


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

Units = sectors of 1 * 512 = 512 bytes

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

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

Disk label type: dos

Disk identifier: 0x000af460


   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048     1026047      512000   83  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 * 512 = 512 bytes

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

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



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

Units = sectors of 1 * 512 = 512 bytes

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

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



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

Units = sectors of 1 * 512 = 512 bytes

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

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


将磁盘分区(这里是将磁盘分一个区)


[root@ZZSRV2 ~]# fdisk /dev/sdb

Welcome to fdisk (util-linux 2.23.2).


Changes will remain in memory only, until you 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):      →这里是可以将磁盘分几个区

First sector (2048-41943039, default 2048):

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039):   →分区的大小不可以超过磁盘的大小

Using default value 41943039

Partition 1 of type Linux and of size 20 GiB is set


Command (m for help): p


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

Units = sectors of 1 * 512 = 512 bytes

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

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

Disk label type: dos

Disk identifier: 0x7d9737a7


   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1            2048    41943039    20970496   83  Linux


Command (m for help): w

The partition table has been altered!


Calling ioctl() to re-read partition table.

Syncing disks.



创建PV

[root@ZZSRV2 ~]# 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   ]

[root@ZZSRV2 ~]# pvcreate /dev/sdb1

  Physical volume "/dev/sdb1" successfully created

[root@ZZSRV2 ~]# 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]


创建VG


[root@ZZSRV2 ~]# vgscan

  Reading all physical volumes.  This may take a while...

  Found volume group "centos_zzsrv1" using metadata type lvm2

[root@ZZSRV2 ~]# vgcreate VG /dev/sdb1

  Volume group "VG" successfully created

[root@ZZSRV2 ~]# vgscan

  Reading all physical volumes.  This may take a while...

  Found volume group "VG" using metadata type lvm2

  Found volume group "centos_zzsrv1" using metadata type lvm2


[root@ZZSRV2 ~]# 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  →记着这个数字

  Alloc PE / Size       0 / 0

  Free  PE / Size       5119 / 20.00 GiB

  VG UUID               qHpcWT-mjRd-xcsT-QBac-XM94-b1H4-P2NQdF



创建一个LV,使用VG的全部PE


[root@ZZSRV2 ~]# lvscan

  ACTIVE            ‘/dev/centos_zzsrv1/swap‘ [2.03 GiB] inherit

  ACTIVE            ‘/dev/centos_zzsrv1/root‘ [37.48 GiB] inherit


LV的名称为LV1

[root@ZZSRV2 ~]# lvcreate -n LV1 -l 5119 VG

  Logical volume "LV1" created


[root@ZZSRV2 ~]# 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

[root@ZZSRV2 ~]# 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


[root@ZZSRV2 ~]# 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   →注意这儿,已经没有剩余空间,说明全部的空间已经被使用

  VG UUID               qHpcWT-mjRd-xcsT-QBac-XM94-b1H4-P2NQdF


Linux 磁盘管理,布布扣,bubuko.com

Linux 磁盘管理

标签:physical   linux   minimum   信息   

原文地址:http://godisgod.blog.51cto.com/9274033/1542378

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!