LVM2 Logical Volume Manager 详解（八）--LVM逻辑卷Logical Volume命令实战
1.创建逻辑卷
root@king:~# lvcreate --help
lvcreate: Create a logical volume
lvcreate
[-A|--autobackup {y|n}]
[-a|--activate [a|e|l]{y|n}] # 是否创建后可以立即被系统使用，默认ay激活，an不激活，快照只可以在激活的卷上创建。
[--addtag Tag]
[--alloc AllocationPolicy]
[-C|--contiguous {y|n}] # 是否连续分配
[-d|--debug]
[-h|-?|--help]
[--ignoremonitoring]
[--monitor {y|n}]
[-i|--stripes Stripes [-I|--stripesize StripeSize]]
{-l|--extents LogicalExtentsNumber[%{VG|PVS|FREE}] | #<span style="font-family: Arial, Helvetica, sans-serif;">条带大小</span>
-L|--size LogicalVolumeSize[bBsSkKmMgGtTpPeE]}
[-M|--persistent {y|n}] [--major major] [--minor minor]
[-m|--mirrors Mirrors [--nosync] [{--mirrorlog {disk|core|mirrored}|--corelog}]] #创建镜像数的逻辑卷，
[-n|--name LogicalVolumeName] #逻辑卷名称
[--noudevsync] #禁用udev同步
[-p|--permission {r|rw}] #设置只读卷或者读写卷
[-r|--readahead ReadAheadSectors|auto|none] #设置逻辑卷
[-R|--regionsize MirrorLogRegionSize] #镜像区域的大小
[-T|--thin [-c|--chunksize ChunkSize]
[--discards {ignore|nopassdown|passdown}]
[--poolmetadatasize MetadataSize[bBsSkKmMgG]]] #薄池元数据大小，范围2MB-16GB。默认值<span style="font-family: arial, sans-serif; font-size: 13px;">(Pool_LV_size / Pool_LV_chunk_size * 64b)，默认单位MB。</span>
[--thinpool ThinPoolLogicalVolume{Name|Path}]
[-t|--test]
[--type VolumeType] #创建指定段类型的逻辑卷，例如Raid5，镜像，快照，薄卷，薄池。-s是--type snapshot的别称。
[-v|--verbose]
[-Z|--zero {y|n}] #控制是否调零逻辑卷的第一个KB的数据
[--version]
VolumeGroupName [PhysicalVolumePath...]
lvcreate
{ {-s|--snapshot} OriginalLogicalVolume[Path] | #创建逻辑卷的快照卷
[-s|--snapshot] VolumeGroupName[Path] -V|--virtualsize VirtualSize}
{-T|--thin} VolumeGroupName[Path][/PoolLogicalVolume] #创建薄池卷
-V|--virtualsize VirtualSize}
[-c|--chunksize] #快照和拨池逻辑卷的块大小，快照的块大小必须是2的整数幂，4KB-512KB，默认4KB。薄池块值64KB-1GB。
[-A|--autobackup {y|n}]
[--addtag Tag]
[--alloc AllocationPolicy]
[-C|--contiguous {y|n}]
[-d|--debug]
[--discards {ignore|nopassdown|passdown}] #薄池的丢弃行为，默认为passdown
[-h|-?|--help]
[--ignoremonitoring]
[--monitor {y|n}]
[-i|--stripes Stripes [-I|--stripesize StripeSize]] #条带数
{-l|--extents LogicalExtentsNumber[%{VG|FREE|ORIGIN}] | #条带大小，<span style="font-family: Arial, Helvetica, sans-serif;">分配新逻辑卷的逻辑块大小，</span>
-L|--size LogicalVolumeSize[bBsSkKmMgGtTpPeE]} #指定新增逻辑卷的大小
[--poolmetadatasize Size[bBsSkKmMgG]]
[-M|--persistent {y|n}] [--major major] [--minor minor]
[-n|--name LogicalVolumeName]
[--noudevsync]
[-p|--permission {r|rw}]
[-r|--readahead ReadAheadSectors|auto|none]
[-t|--test]
[--thinpool ThinPoolLogicalVolume[Path]]
[-v|--verbose]
[--version]
[PhysicalVolumePath...]
创建Raid5逻辑卷
root@king:~# lvcreate --type raid5 -L 1G -i 3 -n lv_1 vg_1 Using default stripesize 64.00 KiB Rounding size (256 extents) up to stripe boundary size (258 extents) Logical volume "lv_1" created root@king:~# pvs PV VG Fmt Attr PSize PFree /dev/sdb1 vg_1 lvm2 a-- 1020.00m 672.00m /dev/sdb2 vg_1 lvm2 a-- 2.00g 1.66g /dev/sdb3 vg_1 lvm2 a-- 1020.00m 672.00m /dev/sdb4 vg_1 lvm2 a-- 1020.00m 672.00m root@king:~# vgs VG #PV #LV #SN Attr VSize VFree vg_1 4 1 0 wz--n- 4.98g 3.62gtype不同，则所需要的条带数大小，需要指定。
2.删除逻辑卷
root@king:~# lvremove --help
lvremove: Remove logical volume(s) from the system
lvremove
[-A|--autobackup y|n]
[-d|--debug]
[-f|--force]
[-h|--help]
[--noudevsync] #禁用udev同步
[-t|--test]
[-v|--verbose]
[--version]
LogicalVolume[Path] [LogicalVolume[Path]...]
3.修改逻辑卷
root@king:~# lvchange --help
lvchange: Change the attributes of logical volume(s)
lvchange
[-A|--autobackup y|n]
[-a|--activate [a|e|l]{y|n}]
[--addtag Tag]
[--alloc AllocationPolicy]
[-C|--contiguous y|n]
[-d|--debug]
[--deltag Tag]
[-f|--force]
[-h|--help]
[--discards {ignore|nopassdown|passdown}]
[--ignorelockingfailure]
[--ignoremonitoring]
[--monitor {y|n}]
[--poll {y|n}]
[--noudevsync]
[-M|--persistent y|n] [--major major] [--minor minor]
[-P|--partial]
[-p|--permission r|rw]
[-r|--readahead ReadAheadSectors|auto|none]
[--refresh] #逻辑卷如果是激活的，刷新元数据。
[--resync] #强制镜像同步
[--sysinit]
[-t|--test]
[-v|--verbose]
[-y|--yes]
[--version]
[-Z|--zero {y|n}]
LogicalVolume[Path] [LogicalVolume[Path]...]
4.逻辑卷转换
root@king:~# lvconvert --help
lvconvert: Change logical volume layout
lvconvert [-m|--mirrors Mirrors [{--mirrorlog {disk|core|mirrored}|--corelog}]]
[--type SegmentType]
[--repair [--use-policies]]
[--replace PhysicalVolume]
[-R|--regionsize MirrorLogRegionSize]
[--alloc AllocationPolicy]
[-b|--background]
[-d|--debug]
[-f|--force]
[-h|-?|--help]
[-i|--interval seconds]
[--stripes Stripes [-I|--stripesize StripeSize]]
[--noudevsync]
[-v|--verbose]
[-y|--yes]
[--version]
LogicalVolume[Path] [PhysicalVolume[Path]...]
lvconvert [--splitmirrors Images --trackchanges]
[--splitmirrors Images --name SplitLogicalVolumeName]
LogicalVolume[Path] [SplittablePhysicalVolume[Path]...]
lvconvert [-s|--snapshot]
[-c|--chunksize]
[-d|--debug]
[-h|-?|--help]
[--noudevsync]
[-v|--verbose]
[-Z|--zero {y|n}]
[--version]
OriginalLogicalVolume[Path] SnapshotLogicalVolume[Path]
lvconvert --merge
[-b|--background]
[-i|--interval seconds]
[-d|--debug]
[-h|-?|--help]
[-v|--verbose]
LogicalVolume[Path]
lvconvert --thinpool ThinPoolLogicalVolume[Path]
[--chunksize size]
[--discards {ignore|nopassdown|passdown}]
[[--poolmetadatasize size] | --poolmetadata ThinMetadataLogicalVolume[Path]]
[-Z|--zero {y|n}]
[-d|--debug] [-h|-?|--help] [-v|--verbose]
5.扩展逻辑卷
root@king:~# lvextend --help
lvextend: Add space to a logical volume
lvextend
[-A|--autobackup y|n]
[--alloc AllocationPolicy]
[-d|--debug]
[-f|--force]
[-h|--help]
[-i|--stripes Stripes [-I|--stripesize StripeSize]] #扩展条带数
{-l|--extents [+]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}] |
-L|--size [+]LogicalVolumeSize[bBsSkKmMgGtTpPeE]} #扩展逻辑块大小
[-m|--mirrors Mirrors]
[--nosync]
[--use-policies]
[-n|--nofsck]
[--noudevsync]
[-r|--resizefs]
[-t|--test]
[--type VolumeType]
[-v|--verbose]
[--version]
LogicalVolume[Path] [ PhysicalVolumePath... ]
6.缩减逻辑卷
root@king:~# lvreduce --help
lvreduce: Reduce the size of a logical volume
lvreduce
[-A|--autobackup y|n]
[-d|--debug]
[-f|--force]
[-h|--help]
{-l|--extents [-]LogicalExtentsNumber[%{VG|LV|FREE|ORIGIN}] |
-L|--size [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]}
[-n|--nofsck]
[--noudevsync]
[-r|--resizefs] #和逻辑卷一起调整底层文件系统大小，使用fsadm
[-t|--test]
[-v|--verbose]
[-y|--yes]
[--version]
LogicalVolume[Path]
7.重命名，修改大小
root@king:~# lvrename --help
lvrename: Rename a logical volume
lvrename
[-A|--autobackup {y|n}]
[-d|--debug]
[-h|-?|--help]
[--noudevsync]
[-t|--test]
[-v|--verbose]
[--version]
{ OldLogicalVolumePath NewLogicalVolumePath |
VolumeGroupName OldLogicalVolumeName NewLogicalVolumeName }
root@king:~# lvresize --help
lvresize: Resize a logical volume
lvresize
[-A|--autobackup y|n]
[--alloc AllocationPolicy]
[-d|--debug]
[-f|--force]
[-h|--help]
[-i|--stripes Stripes [-I|--stripesize StripeSize]]
{-l|--extents [+|-]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}] |
-L|--size [+|-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]}
[-n|--nofsck]
[--noudevsync]
[-r|--resizefs]
[-t|--test]
[--type VolumeType]
[-v|--verbose]
[--version]
LogicalVolume[Path] [ PhysicalVolumePath... ]
8.显示信息
root@king:~# lvdisplay --help
lvdisplay: Display information about a logical volume
lvdisplay
[-a|--all]
[-c|--colon]
[-d|--debug]
[-h|--help]
[--ignorelockingfailure]
[-m|--maps]
[--nosuffix]
[-P|--partial]
[--units hHbBsSkKmMgGtTpPeE]
[-v|--verbose]
[--version]
[LogicalVolume[Path] [LogicalVolume[Path]...]]
lvdisplay --columns|-C
[--aligned]
[-a|--all]
[-d|--debug]
[-h|--help]
[--ignorelockingfailure]
[--noheadings]
[--nosuffix]
[-o|--options [+]Field[,Field]]
[-O|--sort [+|-]key1[,[+|-]key2[,...]]]
[-P|--partial]
[--segments]
[--separator Separator]
[--unbuffered]
[--units hHbBsSkKmMgGtTpPeE]
[-v|--verbose]
[--version]
[LogicalVolume[Path] [LogicalVolume[Path]...]]
9.扫描卷组
root@king:~# lvscan --help
lvscan: List all logical volumes in all volume groups
lvscan
[-a|--all]
[-b|--blockdevice]
[-d|--debug]
[-h|-?|--help]
[--ignorelockingfailure]
[-P|--partial]
[-v|--verbose]
[--version]
root@king:~# lvmdiskscan --help
lvmdiskscan: List devices that may be used as physical volumes
lvmdiskscan
[-d|--debug]
[-h|--help]
[-l|--lvmpartition]
[--version]
10.显示所有类型
root@king:~# lvm segtypes striped zero error free snapshot mirror raid1 raid10 raid4 raid5 raid5_la raid5_ra raid5_ls raid5_rs raid6 raid6_zr raid6_nr raid6_nc thin-pool thin