linux在线扩容磁盘,Linux在线硬盘扩容的几种解决办法

贴一篇自己写的Linux在线硬盘扩容的几种解决办法，算是经验总结吧。  注：转帖请注明出处！

If disk space not enough issue can&＃39;t be fixed by deleted unused or unnecessary temp files. We could use resize2fs command to extend the disk space on line, will not infect the system.

I neatened a guide in details about how to extend the disk space on line including the normal situation and abnormal status here.

resize2fs - ext2/ext3/ext4 file system resize, listed on different RHEL system, the according command. Ps. Should use root account do the admin operation.

On RHEL6 # e.g. /sbin/resize2fs/dev/vg00/lvol9

On RHEL5 # e.g. /sbin/resize3fs/dev/vg00/lvol9

On RHEL4 # e.g. /sbin/ext2online/dev/vg00/lvol9

The resize2fs program will resize ext2, ext3, or ext4 file systems. It can be used to enlarge or shrink an un-mounted file system located on device.

If the file system is mounted, it can be used to expand the size of the mounted file system, assuming the kernel supports on-line resizing. (As of

this writing, the Linux 2.6 kernel supports on-line resize for file-systems mounted using ext3 only). Using the command to check the kernel version

# uname -r

2.6.32-71.el6.x86_64

Normal Situation

1. Extended the disk space on line:

# /sbin/tune2fs -l /dev/mapper/vg00-lvol9 //To check how much space we can extend.

# /usr/sbin/vgdisplay //To check whether it can be extended or not.

Free PE / Size 30354 / 118.57 GiB

# df -h /opt //To check where it will be extended

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg00-lvol9

50G 0G 50G 100% /opt

# /usr/sbin/lvextend -L+5G /dev/mapper/vg00-lvol9 //Extend on line.

# /sbin/resize2fs /dev/vg00/lvol9 //To take it into effect

Abnormal Situation

1. Situation when device is busy

# fuser -m /opt //identify processes using files or sockets

/opt: 1244c 2721c 16747c 19635c

# kill -9 1244 2721 16747 19635 //kill all the processes.

# umount /opt //umount the directory

# /sbin/resize2fs /dev/vg00/lvol9

resize2fs 1.35 (28-Feb-2004)

Please run &＃39;e2fsck -f /dev/vg00/lvol9&＃39; first.

# e2fsck -f /dev/vg00/lvol9 //To check ext2|ext3|ext4 file system correctness!

e2fsck 1.35 (28-Feb-2004)

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/vg00/lvol9: 1406312/6553600 files (2.8% non-contiguous), 12277130/13107200 blocks

# /sbin/resize2fs /dev/vg00/lvol9

resize2fs 1.35 (28-Feb-2004)

Resizing the filesystem on /dev/vg00/lvol9 to 14417920 (4k) blocks.

The filesystem on /dev/vg00/lvol9 is now 14417920 blocks long.

# mount /opt

# df -h /opt

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg00-lvol9

55G 47G 5.4G 90% /opt

2. Situation when volume group mapper doesn&＃39;t exist…

# /usr/sbin/lvextend -L+5G /dev/mapper/vg00-lvol9

Volume group mapper doesn&＃39;t exist

# /usr/sbin/lvextend -L+5G /dev/vg00/lvol9

3. Situation when iNode of &＃39;/&＃39; directory is full…

# df -ih//To check the iNode usage touched 100% or not. If it is. Extended / directory first, after that then adding others disk space.