linux系统分区扩展,linux系统扩展根分区容量大小
#查看新增加的磁盤
[root@centos002?~]#?fdisk?-l
Disk?/dev/sda:?21.5?GB,?21474836480?bytes
255?heads,?63?sectors/track,?2610?cylinders
Units?=?cylinders?of?16065?*?512?=?8225280?bytes
Sector?size?(logical/physical):?512?bytes?/?512?bytes
I/O?size?(minimum/optimal):?512?bytes?/?512?bytes
Disk?identifier:?0x000c8b4b
Device?Boot??????Start?????????End??????Blocks???Id??System
/dev/sda1???*???????????1??????????64??????512000???83??Linux
Partition?1?does?not?end?on?cylinder?boundary.
/dev/sda2??????????????64????????2611????20458496???8e??Linux?LVM
Disk?/dev/sdb:?10.7?GB,?10737418240?bytes
255?heads,?63?sectors/track,?1305?cylinders
Units?=?cylinders?of?16065?*?512?=?8225280?bytes
Sector?size?(logical/physical):?512?bytes?/?512?bytes
I/O?size?(minimum/optimal):?512?bytes?/?512?bytes
Disk?identifier:?0x00000000
#新建分區
[root@centos002?~]#?fdisk?/dev/sdb
Device?contains?neither?a?valid?DOS?partition?table,?nor?Sun,?SGI?or?OSF?disklabel
Building?a?new?DOS?disklabel?with?disk?identifier?0x3ec1c9a6.
Changes?will?remain?in?memory?only,?until?you?decide?to?write?them.
After?that,?of?course,?the?previous?content?won't?be?recoverable.
Warning:?invalid?flag?0x0000?of?partition?table?4?will?be?corrected?by?w(rite)
WARNING:?DOS-compatible?mode?is?deprecated.?It's?strongly?recommended?to
switch?off?the?mode?(command?'c')?and?change?display?units?to
sectors?(command?'u').
Command?(m?for?help):?n
Command?action
e???extended
p???primary?partition?(1-4)
p
Partition?number?(1-4):?1
First?cylinder?(1-1305,?default?1):
Using?default?value?1
Last?cylinder,?+cylinders?or?+size{K,M,G}?(1-1305,?default?1305):
Using?default?value?1305
Command?(m?for?help):?w
The?partition?table?has?been?altered!
Calling?ioctl()?to?re-read?partition?table.
Syncing?disks.
#格式化分區
[root@centos002?~]#?mkfs.ext4?/dev/sdb1
mke2fs?1.41.12?(17-May-2010)
Filesystem?label=
OS?type:?Linux
Block?size=4096?(log=2)
Fragment?size=4096?(log=2)
Stride=0?blocks,?Stripe?width=0?blocks
655360?inodes,?2620595?blocks
131029?blocks?(5.00%)?reserved?for?the?super?user
First?data?block=0
Maximum?filesystem?blocks=2684354560
80?block?groups
32768?blocks?per?group,?32768?fragments?per?group
8192?inodes?per?group
Superblock?backups?stored?on?blocks:
32768,?98304,?163840,?229376,?294912,?819200,?884736,?1605632
Writing?inode?tables:?done
Creating?journal?(32768?blocks):?done
Writing?superblocks?and?filesystem?accounting?information:?done
This?filesystem?will?be?automatically?checked?every?26?mounts?or
180?days,?whichever?comes?first.??Use?tune2fs?-c?or?-i?to?override.
#將新建分區更改為支持LVM格式
[root@centos002?~]#?fdisk?/dev/sdb
WARNING:?DOS-compatible?mode?is?deprecated.?It's?strongly?recommended?to
switch?off?the?mode?(command?'c')?and?change?display?units?to
sectors?(command?'u').
Command?(m?for?help):?p
Disk?/dev/sdb:?10.7?GB,?10737418240?bytes
255?heads,?63?sectors/track,?1305?cylinders
Units?=?cylinders?of?16065?*?512?=?8225280?bytes
Sector?size?(logical/physical):?512?bytes?/?512?bytes
I/O?size?(minimum/optimal):?512?bytes?/?512?bytes
Disk?identifier:?0x3ec1c9a6
Device?Boot??????Start?????????End??????Blocks???Id??System
/dev/sdb1???????????????1????????1305????10482381???83??Linux
Command?(m?for?help):?t
Selected?partition?1
Hex?code?(type?L?to?list?codes):?8e
Changed?system?type?of?partition?1?to?8e?(Linux?LVM)
Command?(m?for?help):?w
The?partition?table?has?been?altered!
Calling?ioctl()?to?re-read?partition?table.
Syncing?disks.
#查看更改后的分區格式
[root@centos002?~]#?fdisk?-l
Disk?/dev/sda:?21.5?GB,?21474836480?bytes
255?heads,?63?sectors/track,?2610?cylinders
Units?=?cylinders?of?16065?*?512?=?8225280?bytes
Sector?size?(logical/physical):?512?bytes?/?512?bytes
I/O?size?(minimum/optimal):?512?bytes?/?512?bytes
Disk?identifier:?0x000c8b4b
Device?Boot??????Start?????????End??????Blocks???Id??System
/dev/sda1???*???????????1??????????64??????512000???83??Linux
Partition?1?does?not?end?on?cylinder?boundary.
/dev/sda2??????????????64????????2611????20458496???8e??Linux?LVM
Disk?/dev/sdb:?10.7?GB,?10737418240?bytes
255?heads,?63?sectors/track,?1305?cylinders
Units?=?cylinders?of?16065?*?512?=?8225280?bytes
Sector?size?(logical/physical):?512?bytes?/?512?bytes
I/O?size?(minimum/optimal):?512?bytes?/?512?bytes
Disk?identifier:?0x3ec1c9a6
Device?Boot??????Start?????????End??????Blocks???Id??System
/dev/sdb1???????????????1????????1305????10482381???8e??Linux?LVM
##查看VG
[root@centos002?~]#?vgdisplay
---?Volume?group?---
VG?Name???????????????vg_centos002
System?ID
Format????????????????lvm2
Metadata?Areas????????1
Metadata?Sequence?No??3
VG?Access?????????????read/write
VG?Status?????????????resizable
MAX?LV????????????????0
Cur?LV????????????????2
Open?LV???????????????2
Max?PV????????????????0
Cur?PV????????????????1
Act?PV????????????????1
VG?Size???????????????19.51?GiB
PE?Size???????????????4.00?MiB
Total?PE??????????????4994
Alloc?PE?/?Size???????4994?/?19.51?GiB
Free??PE?/?Size???????0?/?0
VG?UUID???????????????ugeSA9-XCNj-M5XK-Gz4d-DxoR-7TSv-X9Pq6O
#創建PV與查看
[root@centos002?~]#?pvcreate?/dev/sdb1
Physical?volume?"/dev/sdb1"?successfully?created
[root@centos002?~]#?pvdisplay
---?Physical?volume?---
PV?Name???????????????/dev/sda2
VG?Name???????????????vg_centos002
PV?Size???????????????19.51?GiB?/?not?usable?3.00?MiB
Allocatable???????????yes?(but?full)
PE?Size???????????????4.00?MiB
Total?PE??????????????4994
Free?PE???????????????0
Allocated?PE??????????4994
PV?UUID???????????????Z7AOVb-LEzI-su15-J5lC-alj8-a94k-1NmRRv
"/dev/sdb1"?is?a?new?physical?volume?of?"10.00?GiB"
---?NEW?Physical?volume?---
PV?Name???????????????/dev/sdb1
VG?Name
PV?Size???????????????10.00?GiB
Allocatable???????????NO
PE?Size???????????????0
Total?PE??????????????0
Free?PE???????????????0
Allocated?PE??????????0
PV?UUID???????????????4N37pw-Q59f-FRZE-glEx-lRWh-BY5O-Zk9JrF
#查看LV
[root@centos002?~]#?lvdisplay
---?Logical?volume?---
LV?Path????????????????/dev/vg_centos002/lv_root
LV?Name????????????????lv_root
VG?Name????????????????vg_centos002
LV?UUID????????????????2G4f2m-gkIR-xXG0-MCfO-jFO2-jYNC-IBKYqL
LV?Write?Access????????read/write
LV?Creation?host,?time?centos002,?2017-08-21?13:15:29?+0800
LV?Status??????????????available
#?open?????????????????1
LV?Size????????????????17.57?GiB
Current?LE?????????????4498
Segments???????????????1
Allocation?????????????inherit
Read?ahead?sectors?????auto
-?currently?set?to?????256
Block?device???????????253:0
---?Logical?volume?---
LV?Path????????????????/dev/vg_centos002/lv_swap
LV?Name????????????????lv_swap
VG?Name????????????????vg_centos002
LV?UUID????????????????ITJYHF-bGpM-z314-lW1B-q8gj-8tgl-8NZ4bM
LV?Write?Access????????read/write
LV?Creation?host,?time?centos002,?2017-08-21?13:15:34?+0800
LV?Status??????????????available
#?open?????????????????1
LV?Size????????????????1.94?GiB
Current?LE?????????????496
Segments???????????????1
Allocation?????????????inherit
Read?ahead?sectors?????auto
-?currently?set?to?????256
Block?device???????????253:1
#LVM擴容
[root@centos002?~]#?vgextend?vg_centos002?/dev/sdb1
Volume?group?"vg_centos002"?successfully?extended
[root@centos002?~]#?vgdisplay
---?Volume?group?---
VG?Name???????????????vg_centos002
System?ID
Format????????????????lvm2
Metadata?Areas????????2
Metadata?Sequence?No??4
VG?Access?????????????read/write
VG?Status?????????????resizable
MAX?LV????????????????0
Cur?LV????????????????2
Open?LV???????????????2
Max?PV????????????????0
Cur?PV????????????????2
Act?PV????????????????2
VG?Size???????????????29.50?GiB
PE?Size???????????????4.00?MiB
Total?PE??????????????7552
Alloc?PE?/?Size???????4994?/?19.51?GiB
Free??PE?/?Size???????2558?/?9.99?GiB
VG?UUID???????????????ugeSA9-XCNj-M5XK-Gz4d-DxoR-7TSv-X9Pq6O
#此時查看磁盤大小并沒有增加
[root@centos002?~]#?df?-h
Filesystem????????????Size??Used?Avail?Use%?Mounted?on
/dev/mapper/vg_centos002-lv_root
18G??803M???16G???5%?/
tmpfs?????????????????238M?????0??238M???0%?/dev/shm
/dev/sda1?????????????477M???28M??425M???7%?/boot
#擴展LVM分區大小
[root@centos002?~]#?lvextend?-L?28G?/dev/vg_centos002/lv_root
Insufficient?free?space:?2670?extents?needed,?but?only?2558?available
#報錯說明擴容的空間不足，需要調整值
[root@centos002?~]#?lvextend?-L?27G?/dev/vg_centos002/lv_root
Size?of?logical?volume?vg_centos002/lv_root?changed?from?17.57?GiB?(4498?extents)?to?27.00?GiB?(6912?extents).
Logical?volume?lv_root?successfully?resized.
[root@centos002?~]#?lvdisplay
---?Logical?volume?---
LV?Path????????????????/dev/vg_centos002/lv_root
LV?Name????????????????lv_root
VG?Name????????????????vg_centos002
LV?UUID????????????????2G4f2m-gkIR-xXG0-MCfO-jFO2-jYNC-IBKYqL
LV?Write?Access????????read/write
LV?Creation?host,?time?centos002,?2017-08-21?13:15:29?+0800
LV?Status??????????????available
#?open?????????????????1
LV?Size????????????????27.00?GiB
Current?LE?????????????6912
Segments???????????????2
Allocation?????????????inherit
Read?ahead?sectors?????auto
-?currently?set?to?????256
Block?device???????????253:0
---?Logical?volume?---
LV?Path????????????????/dev/vg_centos002/lv_swap
LV?Name????????????????lv_swap
VG?Name????????????????vg_centos002
LV?UUID????????????????ITJYHF-bGpM-z314-lW1B-q8gj-8tgl-8NZ4bM
LV?Write?Access????????read/write
LV?Creation?host,?time?centos002,?2017-08-21?13:15:34?+0800
LV?Status??????????????available
#?open?????????????????1
LV?Size????????????????1.94?GiB
Current?LE?????????????496
Segments???????????????1
Allocation?????????????inherit
Read?ahead?sectors?????auto
-?currently?set?to?????256
Block?device???????????253:1
#再次查看磁盤大小還是沒有增加
[root@centos002?~]#?df?-h
Filesystem????????????Size??Used?Avail?Use%?Mounted?on
/dev/mapper/vg_centos002-lv_root
18G??803M???16G???5%?/
tmpfs?????????????????238M?????0??238M???0%?/dev/shm
/dev/sda1?????????????477M???28M??425M???7%?/boot
#重設根分區大小
[root@centos002?~]#?resize2fs?/dev/vg_centos002/lv_root
resize2fs?1.41.12?(17-May-2010)
Filesystem?at?/dev/vg_centos002/lv_root?is?mounted?on?/;?on-line?resizing?required
old?desc_blocks?=?2,?new_desc_blocks?=?2
Performing?an?on-line?resize?of?/dev/vg_centos002/lv_root?to?7077888?(4k)?blocks.
The?filesystem?on?/dev/vg_centos002/lv_root?is?now?7077888?blocks?long.
#重新查看根分區大小
[root@centos002?~]#?df?-h
Filesystem????????????Size??Used?Avail?Use%?Mounted?on
/dev/mapper/vg_centos002-lv_root
27G??803M???25G???4%?/
tmpfs?????????????????238M?????0??238M???0%?/dev/shm
/dev/sda1?????????????477M???28M??425M???7%?/boot
總結
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