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From Ningning Li <liningn...@wandoujia.com>
Subject Re: 怎么增加kvm 硬盘的大小
Date Mon, 20 May 2013 09:56:32 GMT
好的,多谢。

我用的是centos 6.3,现在有很多KVM虚拟机在线上用,之前没有考虑过动态调整
硬盘和网卡等。

请问 如何 动态调整cpu核数和内存大小呢 :)





2013/5/20 Gavin Lee <gavin.lxh@gmail.com>

> 经常这样操作, 你可以先在新建一个Volume, 然后Attach到已运行的VM上.
再通过lvextend的相关命令扩充即可. 不需要关机就可操作.
>
> 不知你OS是什么发行版, 在Redhat/CentOS下, 假设之前有一个20G的盘, 要再扩充40G的空间,
> 可以新添加了一个卷(/dev/sdb), 具体命令及步骤:
>
> 1.            Add new physical disk. Boot.
>
> 2.            # pvscan
>
> This will show you the current physical volumes.
>
> 3.            # fdisk /dev/sdb
>
> Add the disk to your machine as a primary partition. Partition type: “8e
> (LVM)”. Obviously /dev/sdb may be different on your system.
>
> 4.            # pvcreate /dev/sdb1
>
> This creates a new physical LVM volume on our new disk.
>
> 5.            # vgextend VolGroup00 /dev/sdb1
>
> Add our new physical volume to the volume group: VolGroup00. Again, this
> group name may by different for you, but this is what Redhat & CentOS
> assigns by default when you install your system.
>
> 6.            # pvscan
>
> You should see the new physical volume assigned to VolGroup00.
>
> 7.            # lvextend -L+40G /dev/VolGroup00/LogVol00
>
> This increases the size of the logical volume our root partition resides
> in. Change the -L flag as appropriate.
>
> We’ve just added 40GB to the logical volume used by the root partition.
> Sweet as. Now we need to resize the file system to utilize the additional
> space.
>
> 8.            Reboot into rescue mode using your CentOS CDROM.
>
> From memory this involves typing linux rescue as your boot option.
>
> 9.            When prompted, skip the mounting of system partitions.
>
> 10.        # lvm vgchange -a y
>
> This command makes your LVM volumes accessible.
>
> 11.        # e2fsck -f /dev/VolGroup00/LogVol00
>
> Run a file system check, the -f flag seems necessary. No idea what we do if
> the returns an error?
>
> 12.        # resize2fs /dev/VolGroup00/LogVol00
>
> Without any parameters resize2fs will just increase the file system to the
> max space available.
>
>
> 需要注意的是, 这个附加的盘不要再从这个VM上Dettach
>
>
>
> 2013/5/20 Ningning Li <liningning@wandoujia.com>
>
> > 用的lvm的存储池,虚拟机的数据盘是一个单独的卷,现在想增加虚拟机数据盘大小,请问怎么增加呢?可以不停机么?
> >
> >
> >
> > --
> > Ningning Li
> > sa | Wandou Labs
> > qq 468032221
> > tel 186 1220 6308
> >
>
>
>
> --
> Gavin
>



-- 
Ningning Li
sa | Wandou Labs
qq 468032221
tel 186 1220 6308

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