linux动态增加LV空间的方法

linux  /  管理员 发布于 7年前   213

一直都说LVM可以在线增加空间，一直都没有试过

下面小试一下：

1.增加硬盘

2.创建PV

3.添加PV到VG

4.扩展LV

1.增加硬盘

该干嘛干嘛

添加后需要重启（有知道不用重启的办法吗）

--这个是新添加的硬盘  [root@localhost ~]# fdisk -l /dev/sdb  Disk /dev/sdb: 5368 MB, 5368709120 bytes  255 heads, 63 sectors/track, 652 cylinders  Units = cylinders of 16065 * 512 = 8225280 bytes  Disk /dev/sdb doesn't contain a valid partition table

2.创建PV

--命令很简单

--命令很简单  [root@localhost ~]# pvcreate /dev/sdb    Physical volume "/dev/sdb" successfully created    --可以看到新的PV了  [root@localhost ~]# pvdisplay    /dev/hdc: open failed: No medium found    --- Physical volume ---    PV Name   /dev/sda2    VG Name   VolGroup00    PV Size   9.90 GB / not usable 22.76 MB    Allocatable           yes (but full)    PE Size (KByte)       32768    Total PE  316    Free PE   0    Allocated PE          316    PV UUID   n5fS6M-jBiH-n9vU-pBTd-iOCv-BbTe-BUeNZo         "/dev/sdb" is a new physical volume of "5.00 GB"    --- NEW Physical volume ---    PV Name   /dev/sdb    VG Name       PV Size   5.00 GB    Allocatable           NO    PE Size (KByte)       0    Total PE  0    Free PE   0    Allocated PE          0    PV UUID   TDs3mN-3ON3-eHbl-cohr-7Hr3-8608-jiLlXG  

3.添加PV到VG

--指定对应的VG和PV  [root@localhost ~]# vgextend VolGroup00 /dev/sdb    Volume group "VolGroup00" successfully extended    --看到新的5G添加到VG里面了，状态是没有分配  [root@localhost ~]# vgdisplay     --- Volume group ---    VG Name   VolGroup00    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   14.84 GB    PE Size   32.00 MB    Total PE  475    Alloc PE / Size       316 / 9.88 GB    Free  PE / Size       159 / 4.97 GB    VG UUID   x1uyPD-qBgE-2yQV-T1Cb-IGIz-e4LB-fghf1W  

4.扩展LV

--先添加2G练手  [root@localhost ~]# lvextend -L +2G /dev/VolGroup00/LogVol00    Extending logical volume LogVol00 to 10.88 GB    Logical volume LogVol00 successfully resized  --成功后还未看到新的空间  [root@localhost ~]# df -m  Filesystem           1M-blocks      Used Available Use% Mounted on  /dev/mapper/VolGroup00-LogVol00    8804      7362       988  89% /  --需要手动刷新  [root@localhost ~]# resize2fs /dev/VolGroup00/LogVol00  resize2fs 1.39 (29-May-2006)  Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing required  Performing an on-line resize of /dev/VolGroup00/LogVol00 to 2850816 (4k) blocks.  The filesystem on /dev/VolGroup00/LogVol00 is now 2850816 blocks long.    --现在就完成了  [root@localhost ~]# df -m  Filesystem           1M-blocks      Used Available Use% Mounted on  /dev/mapper/VolGroup00-LogVol00   10788      7365      2867  72% / 

若需要先缩小则使用以下命令：

lvreduce -L -20G /dev/mapper/vg_mysvr-lv_home

resize2fs /dev/mapper/vg_my-lv_home

lvextend -L +20G /dev/mapper/vg_mysvr-lv_root

resize2fs /dev/mapper/vg_mysvr-lv_root