linux下移動磁盤空間
目的：將/home下的磁盤空間移動到/下面
操作：
1.查看磁盤空間情況
[root@compute home]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_compute-lv_root
531G 48G 478G 10% /
tmpfs 16G 88K 16G 1% /dev/shm
/dev/mapper/ddf1_4c5349202020202010000055000000004711471100001450p1
485M 38M 422M 9% /boot
2.卸載/home
umount /home/
3.查看邏輯卷組信息
[root@compute home]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_compute 1 3 0 wz--n- 556.44g 712.00m
4.檢查磁盤是否正常
e2fsck -f /dev/vg_compute/lv_home
5.縮小/home磁盤大小
resize2fs /dev/vg_compute/lv_home 1024M
lvreduce -L 1024M /dev/vg_compute/lv_home
6.擴展/磁盤大小
lvextend -L + 489G /dev/vg_compute/lv_root
resize2fs /dev/vg_compute/lv_root
7.掛載/home
mount /home
8./home下的用戶文件夾恢復
一、新建用戶文件夾並修改所屬權限
mkdir /home/shome
chown shome:shome /home/shome
二、將 /etc/skel 目錄裡所有的文件(隱藏文件) 復制到 用戶的默認目錄裡即可解決問題.
cp /etc/skel/.bash* /home/shome/
在Centos中創建新用戶,但不知道為什麼在用戶的默認目錄文件夾裡沒有產生".bash_profile".
在切換到新用戶的時候,會出現下面的問題,不會出現shell的名字
解決方法:
將 /etc/skel 目錄裡所有的文件(隱藏文件) 復制到 用戶的默認目錄裡即可解決問題.
由於Openstack的Volume需要一塊獨立的分卷，所以我在分區的時候就直接創建了一個Volume作為vg。這裡注意vg的名字一定要為"nova-vloumes",通過vgdisplay可以查看
附錄：
一 pvs,lvs vgs 使用
--1.1 顯示物理卷(pv)信息
[root@redhat6 lvm]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g
--1.2 顯示邏輯卷組(vg)信息
[root@redhat6 lvm]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g
--1.3顯示邏輯卷(lv)信息
[root@redhat6 lvm]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv_pgdata_01 vg_redhat6 -wi-ao 700.00m
lv_root vg_redhat6 -wi-ao 13.10g
lv_swap vg_redhat6 -wi-ao 1.91g
備注：前面的 pvs,lvs,vgs 命令簡單顯示 LVM 對像信息，都是默認的輸出。
二 格式化控制
--2.1 顯示額外信息
[root@redhat6 lvm]# pvs -v
Scanning for physical volume names
PV VG Fmt Attr PSize PFree DevSize PV UUID
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0 14.51g dpTW84-DHRy-PIA9-u1tY-YUH4-XQKw-8Hy2Zm
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g 4.00g YKIQwX-zc6H-TZ65-P3qr-sRfk-LX0p-T18vdG
[root@redhat6 lvm]# vgs -v
Finding all volume groups
Finding volume group "vg_redhat6"
VG Attr Ext #PV #LV #SN VSize VFree VG UUID
vg_redhat6 wz--n- 4.00m 2 3 0 18.50g 2.81g E6cA2U-TL1x-ScCV-UnGU-3Kq4-1u6V-WUb5L4
備注：增加 -v 參數，會顯示LVM 對像的額外信息，例如 UUID字段。
--2.2 pvs 默認輸出
[root@redhat6 lvm]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g
--2.3 只顯示 pv_name,dev_size 字段
[root@redhat6 lvm]# pvs -o pv_name,dev_size
PV DevSize
/dev/sda2 14.51g
/dev/sdb 4.00g
備注：增加 -o 參數，指定需要輸出的字段。
--2.4 在pvs 默認輸出上，增加字段
[root@redhat6 lvm]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g
[root@redhat6 lvm]# pvs -o +pv_uuid
PV VG Fmt Attr PSize PFree PV UUID
/dev/sda2 vg_redhat6 lvm2 a-- 14.51g 0 dpTW84-DHRy-PIA9-u1tY-YUH4-XQKw-8Hy2Zm
/dev/sdb vg_redhat6 lvm2 a-- 4.00g 2.81g YKIQwX-zc6H-TZ65-P3qr-sRfk-LX0p-T18vdG
備注：如果想在默認輸出的前提下增加字段，可以使用 -o + 字段名。
--2.5 vgs 顯示卷組成員
[root@redhat6 lvm]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g
[root@redhat6 lvm]# vgs -o +lv_name
VG #PV #LV #SN Attr VSize VFree LV
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g lv_root
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g lv_swap
vg_redhat6 2 3 0 wz--n- 18.50g 2.81g lv_pgdata_01
三 字段排序
--3.1 根據 lv_size 字段排序
[root@redhat6 lvm]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv_pgdata_01 vg_redhat6 -wi-ao 700.00m
lv_root vg_redhat6 -wi-ao 13.10g
lv_swap vg_redhat6 -wi-ao 1.91g
[root@redhat6 lvm]# lvs -O lv_size
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv_pgdata_01 vg_redhat6 -wi-ao 700.00m
lv_swap vg_redhat6 -wi-ao 1.91g
lv_root vg_redhat6 -wi-ao 13.10g
備注：如果想根據輸出字段排序，可以使用 -O 字段名 選項。
四附 lvs,vgs,pvs 字段
--4.1 lvs 字段
---------------------
lv_all - All fields in this section.
lv_uuid - Unique identifier.
lv_name - Name. LVs created for internal use are enclosed in brackets.
lv_path - Full pathname for LV.
lv_attr - Various attributes - see man page.
lv_major - Persistent major number or -1 if not persistent.
lv_minor - Persistent minor number or -1 if not persistent.
lv_read_ahead - Read ahead setting in current units.
lv_kernel_major - Currently assigned major number or -1 if LV is not active.
lv_kernel_minor - Currently assigned minor number or -1 if LV is not active.
lv_kernel_read_ahead - Currently-in-use read ahead setting in current units.
lv_size - Size of LV in current units.
seg_count - Number of segments in LV.
origin - For snapshots, the origin device of this LV.
origin_size - For snapshots, the size of the origin device of this LV.
snap_percent - For snapshots, the percentage full if LV is active.
copy_percent - For mirrors and pvmove, current percentage in-sync.
move_pv - For pvmove, Source PV of temporary LV created by pvmove.
convert_lv - For lvconvert, Name of temporary LV created by lvconvert.
lv_tags - Tags, if any.
mirror_log - For mirrors, the LV holding the synchronisation log.
modules - Kernel device-mapper modules required for this LV.
--4.2 pvs 字段
pv_all - All fields in this section.
pe_start - Offset to the start of data on the underlying device.
pv_size - Size of PV in current units.
pv_free - Total amount of unallocated space in current units.
pv_used - Total amount of allocated space in current units.
pv_attr - Various attributes - see man page.
pv_pe_count - Total number of Physical Extents.
pv_pe_alloc_count - Total number of allocated Physical Extents.
pv_tags - Tags, if any.
pv_mda_count - Number of metadata areas on this device.
pv_mda_used_count - Number of metadata areas in use on this device.
--4.3 vgs 字段
vg_all - All fields in this section.
vg_fmt - Type of metadata.
vg_uuid - Unique identifier.
vg_name - Name.
vg_attr - Various attributes - see man page.
vg_size - Total size of VG in current units.
vg_free - Total amount of free space in current units.
vg_sysid - System ID indicating when and where it was created.
vg_extent_size - Size of Physical Extents in current units.
vg_extent_count - Total number of Physical Extents.
vg_free_count - Total number of unallocated Physical Extents.
max_lv - Maximum number of LVs allowed in VG or 0 if unlimited.
max_pv - Maximum number of PVs allowed in VG or 0 if unlimited.
pv_count - Number of PVs.
lv_count - Number of LVs.
snap_count - Number of snapshots.
vg_seqno - Revision number of internal metadata. Incremented whenever it changes.
vg_tags - Tags, if any.
vg_mda_count - Number of metadata areas on this VG.
vg_mda_used_count - Number of metadata areas in use on this VG.
vg_mda_free - Free metadata area space for this VG in current units.
vg_mda_size - Size of smallest metadata area for this VG in current units.
vg_mda_copies - Target number of in use metadata areas in the VG.
