lvcreate指令：创建逻辑卷
【语 法】lvcreate [选项] [参数]
【功能介绍】lvcreate指令用于创建LVM的逻辑卷。
主要参数
-L 指定逻辑卷的大小，单位为“kKmMgGtT”字节
-l 指定逻辑卷的大小（LE数）
-n 后面跟逻辑卷名
-s 创建快照
磁盘信息
[root@www ~]# fdisk -l Disk /dev/hda: 41.1 GB, 41174138880 bytes 255 heads, 63 sectors/track, 5005 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/hda1 * 1 13 104391 83 Linux /dev/hda2 14 1288 10241437+ 83 Linux /dev/hda3 1289 1925 5116702+ 83 Linux /dev/hda4 1926 5005 24740100 5 Extended /dev/hda5 1926 2052 1020096 82 Linux swap / Solaris /dev/hda6 2053 2235 1469916 8e Linux LVM /dev/hda7 2236 2418 1469916 8e Linux LVM /dev/hda8 2419 2601 1469916 8e Linux LVM /dev/hda9 2602 2784 1469916 8e Linux LVMLV阶段，逻辑卷操作
[root@www ~]# pvscan #有三个 PV 被用去，剩下一个 /dev/hda9 的 PV 沒被用掉！ PV /dev/hda6 VG vbirdvg lvm2 [1.39 GB / 1.39 GB free] PV /dev/hda7 VG vbirdvg lvm2 [1.39 GB / 1.39 GB free] PV /dev/hda8 VG vbirdvg lvm2 [1.39 GB / 1.39 GB free] PV /dev/hda9 lvm2 [1.40 GB] Total: 4 [5.57 GB] / in use: 3 [4.17 GB] / in no VG: 1 [1.40 GB] [root@www ~]# vgdisplay # 最后那三行指的就是 PE 能够使用的情況！由于尚未切出 LV，因此所有的 PE均可自由使用。 --- Volume group --- VG Name vbirdvg System ID Format lvm2 Metadata Areas 3 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 3 Act PV 3 VG Size 4.17 GB #整个 VG 容量就这么大 PE Size 16.00 MB #內部每个 PE 的大小 Total PE 267 #总共的 PE 数量！ Alloc PE / Size 0 / 0 Free PE / Size 267 / 4.17 GB VG UUID 4VU5Jr-gwOq-jkga-sUPx-vWPu-PmYm-dZH9EO [root@www ~]# lvcreate -l 356 -n vbirdlv vbirdvg #将整个 vbirdvg 通通分配給 vbirdlv 啊，要注意， PE 共有 356 个 Logical volume "vbirdlv" created [root@www ~]# ll /dev/vbirdvg/vbirdlv lrwxrwxrwx 1 root root 27 Mar 11 16:49 /dev/vbirdvg/vbirdlv -> /dev/mapper/vbirdvg-vbirdlv # 看见了沒有啊！这就是我们最重要的一步 [root@www ~]# lvdisplay --- Logical volume --- LV Name /dev/vbirdvg/vbirdlv #LV逻辑卷的名字 VG Name vbirdvg LV UUID 8vFOPG-Jrw0-Runh-ug24-t2j7-i3nA-rPEyq0 LV Write Access read/write LV Status available # open 0 LV Size 5.56 GB #LV的大小 Current LE 356 Segments 4 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0格式化逻辑卷，并且挂载
[root@www ~]# mkfs -t ext3 /dev/vbirdvg/vbirdlv #格式化 [root@www ~]# mkdir /mnt/lvm [root@www ~]# mount /dev/vbirdvg/vbirdlv /mnt/lvm #挂载目录 [root@www ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda2 9920624 3858984 5549572 42% / /dev/hda3 4956316 1056996 3643488 23% /home /dev/hda1 101086 21408 74459 23% /boot tmpfs 371332 0 371332 0% /dev/shm /dev/mapper/vbirdvg-vbirdlv 5741020 142592 5306796 3% /mnt/lvm增加 LV 容量
[root@www ~]# fdisk -l Device Boot Start End Blocks Id System ....(中间省略).... /dev/hda10 2785 3150 2939863+ 8e Linux LVM #增加一下lvm /dev/hda10 [root@www ~]# pvcreate /dev/hda10 建立新的 PV Physical volume "/dev/hda10" successfully created [root@www ~]# pvscan #查看PG物理卷 PV /dev/hda6 VG vbirdvg lvm2 [1.39 GB / 0 free] PV /dev/hda7 VG vbirdvg lvm2 [1.39 GB / 0 free] PV /dev/hda8 VG vbirdvg lvm2 [1.39 GB / 0 free] PV /dev/hda9 VG vbirdvg lvm2 [1.39 GB / 0 free] PV /dev/hda10 lvm2 [2.80 GB] # 可以看到 /dev/hda10 是新加入，尚未使用 Total: 5 [8.37 GB] / in use: 4 [5.56 GB] / in no VG: 1 [2.80 GB] [root@www ~]# vgextend vbirdvg /dev/hda10 #加大 VG ，利用 vgextend 功能 Volume group "vbirdvg" successfully extended [root@www ~]# vgdisplay #查看VG逻辑卷组 --- Volume group --- VG Name vbirdvg System ID Format lvm2 Metadata Areas 5 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 5 Act PV 5 VG Size 8.36 GB PE Size 16.00 MB Total PE 535 Alloc PE / Size 356 / 5.56 GB Free PE / Size 179 / 2.80 GB VG UUID 4VU5Jr-gwOq-jkga-sUPx-vWPu-PmYm-dZH9EO [root@www ~]# lvresize -l +179 /dev/vbirdvg/vbirdlv #利用 lvresize 的功能來增加LV Extending logical volume vbirdlv to 8.36 GB Logical volume vbirdlv successfully resized [root@www ~]# lvdisplay #显示LV逻辑卷 --- Logical volume --- LV Name /dev/vbirdvg/vbirdlv VG Name vbirdvg LV UUID 8vFOPG-Jrw0-Runh-ug24-t2j7-i3nA-rPEyq0 LV Write Access read/write LV Status available # open 1 LV Size 8.36 GB Current LE 535 Segments 5 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 [root@www ~]# df /mnt/lvm #查看大小 Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vbirdvg-vbirdlv 5741020 261212 5188176 5% /mnt/lvm [root@www ~]# resize2fs /dev/vbirdvg/vbirdlv #LV分区重设大小 resize2fs 1.39 (29-May-2006) Filesystem at /dev/vbirdvg/vbirdlv is mounted on /mnt/lvm; on-line resizing Performing an on-line resize of /dev/vbirdvg/vbirdlv to 2191360 (4k) blocks. The filesystem on /dev/vbirdvg/vbirdlv is now 2191360 blocks long.减小 LV 容量
[root@www ~]# umount /mnt/lvm #取消挂载 [root@www ~]# e2fsck -f /dev/vbirdvg/vbirdlv #磁盘检测 e2fsck 1.39 (29-May-2006) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/vbirdvg/vbirdlv: 2438/1087008 files (0.1% non-contiguous), [root@www ~]# resize2fs /dev/vbirdvg/vbirdlv 6900M #重设大小 resize2fs 1.39 (29-May-2006) Resizing the filesystem on /dev/vbirdvg/vbirdlv to 1766400 (4k) blocks. The filesystem on /dev/vbirdvg/vbirdlv is now 1766400 blocks long. [root@www ~]# mount /dev/vbirdvg/vbirdlv /mnt/lvm #挂载LVM [root@www ~]# df /mnt/lvm Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vbirdvg-vbirdlv 6955584 262632 6410328 4% /mnt/lvm [root@www ~]# lvresize -l -89 /dev/vbirdvg/vbirdlv #降低 LV 的容量 WARNING: Reducing active and open logical volume to 6.97 GB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce vbirdlv? [y/n]: y Reducing logical volume vbirdlv to 6.97 GB Logical volume vbirdlv successfully resized [root@www ~]# lvdisplay #查看lv逻辑卷信息 --- Logical volume --- LV Name /dev/vbirdvg/vbirdlv VG Name vbirdvg LV UUID 8vFOPG-Jrw0-Runh-ug24-t2j7-i3nA-rPEyq0 LV Write Access read/write LV Status available # open 1 LV Size 6.97 GB Current LE 446 Segments 5 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 [root@www ~]# pvdisplay #先确认 /dev/hda6 是否將 PE 都移除了 --- Physical volume --- PV Name /dev/hda6 VG Name vbirdvg PV Size 1.40 GB / not usable 11.46 MB Allocatable yes (but full) PE Size (KByte) 16384 Total PE 89 Free PE 0 Allocated PE 89 PV UUID Z13Jk5-RCls-UJ8B-HzDa-Gesn-atku-rf2biN ....(中間省略).... --- Physical volume --- PV Name /dev/hda10 VG Name vbirdvg PV Size 2.80 GB / not usable 6.96 MB Allocatable yes PE Size (KByte) 16384 Total PE 179 Free PE 89 Allocated PE 90 PV UUID 7MfcG7-y9or-0Jmb-H7RO-5Pa5-D3qB-G426Vq [root@www ~]# pvmove /dev/hda6 /dev/hda10 #將 /dev/hda6 內的 PE 移动到 /dev/hda10 [root@www ~]# vgreduce vbirdvg /dev/hda6 #將 /dev/hda6从vbirdvg 移出 Removed "/dev/hda6" from volume group "vbirdvg" [root@www ~]# pvscan PV /dev/hda7 VG vbirdvg lvm2 [1.39 GB / 0 free] PV /dev/hda8 VG vbirdvg lvm2 [1.39 GB / 0 free] PV /dev/hda9 VG vbirdvg lvm2 [1.39 GB / 0 free] PV /dev/hda10 VG vbirdvg lvm2 [2.80 GB / 0 free] PV /dev/hda6 lvm2 [1.40 GB] Total: 5 [8.37 GB] / in use: 4 [6.97 GB] / in no VG: 1 [1.40 GB] [root@www ~]# pvremove /dev/hda6 #移出物理卷hda6 Labels on physical volume "/dev/hda6" successfully wiped快照区的建立
[root@www ~]# vgdisplay #查看VG容量 --- Volume group --- VG Name vbirdvg ....(其他省略).... VG Size 6.97 GB PE Size 16.00 MB Total PE 446 Alloc PE / Size 446 / 6.97 GB Free PE / Size 0 / 0 [root@www ~]# pvcreate /dev/hda6 #创建PV物理卷 Physical volume "/dev/hda6" successfully created [root@www ~]# vgextend vbirdvg /dev/hda6 #将刚刚移除的 /dev/hda6 加入這個 VG Volume group "vbirdvg" successfully extended [root@www ~]# vgdisplay #查看VG --- Volume group --- VG Name vbirdvg ....(其他省略).... VG Size 8.36 GB PE Size 16.00 MB Total PE 535 Alloc PE / Size 446 / 6.97 GB Free PE / Size 89 / 1.39 GB #多出了 89 个 可用PE [root@www ~]# lvcreate -l 60 -s -n vbirdss /dev/vbirdvg/vbirdlv #利用 lvcreate 建立系统快照区，命名为vbirdss，且经于 60 个 PE Logical volume "vbirdss" created [root@www ~]# lvdisplay --- Logical volume --- LV Name /dev/vbirdvg/vbirdss VG Name vbirdvg LV UUID K2tJ5E-e9mI-89Gw-hKFd-4tRU-tRKF-oeB03a LV Write Access read/write LV snapshot status active destination for /dev/vbirdvg/vbirdlv LV Status available # open 0 LV Size 6.97 GB #原LV的大小 Current LE 446 COW-table size 960.00 MB #新建快照区的实际大小 COW-table LE 60 #快照区占有的PE Allocated to snapshot 0.00% Snapshot chunk size 4.00 KB Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 [root@www ~]# mkdir /mnt/snapshot [root@www ~]# mount /dev/vbirdvg/vbirdss /mnt/snapshot [root@www ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda2 9920624 3859032 5549524 42% / /dev/hda3 4956316 1056996 3643488 23% /home /dev/hda1 101086 21408 74459 23% /boot tmpfs 371332 0 371332 0% /dev/shm /dev/mapper/vbirdvg-vbirdlv 6955584 262632 6410328 4% /mnt/lvm #二个一样 /dev/mapper/vbirdvg-vbirdss 6955584 262632 6410328 4% /mnt/snapshot #二个一样
评论（1）
- lvcreate -l 疑问回复(2018-07-05 16:37:55): [回复]