认真就输

        今天在做gc 12cr2版本的实验的时候，发现/目录的空间不够了，于是手动增加了一块盘，在线扩文件系统，不过前提是/文件系统是放到VG里面的，而不是单独的分区，如果是单个分区，是不能扩的。

测试环境：OS:RHEL 5.4

1，查看硬盘

      如果硬盘没有发现，我们可以通过/etc/init.d/kudzu来在线发现，一直觉得LINUX在线配置硬件设置这块，就没有AIX这一块做得好。

[root@gc12r2 ~]# fdisk -l

Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14        5221    41833260   8e  Linux LVM

Disk /dev/sdb: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table

2，格式化磁盘

[root@gc12r2 ~]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created

3，把PV增加到VG中

[root@gc12r2 ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  rootvg   1   2   0 wz--n- 39.88G 2.50G
  
  
[root@gc12r2 ~]# vgextend rootvg /dev/sdb
  /dev/hdc: open failed: Read-only file system
  /dev/cdrom: open failed: Read-only file system
  Attempt to close device '/dev/cdrom' which is not open.
  Volume group "rootvg" successfully extended
  
  
[root@gc12r2 ~]# vgdisplay -v
    Finding all volume groups
    Finding volume group "rootvg"
  --- Volume group ---
  VG Name               rootvg
  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               79.84 GB
  PE Size               32.00 MB
  Total PE              2555
  Alloc PE / Size       1196 / 37.38 GB
  Free  PE / Size       1359 / 42.47 GB
  VG UUID               1zJ3d3-b5WO-qNXD-F6a6-j4mA-rKMj-k7Ar8r
   
  --- Logical volume ---
  LV Name                /dev/rootvg/rootlv
  VG Name                rootvg
  LV UUID                apcaZv-CeDg-gNmg-f7pL-duSG-4UPj-REGcAp
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                29.28 GB
  Current LE             937
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Name                /dev/rootvg/swap
  VG Name                rootvg
  LV UUID                LsMRXz-C0oh-rnvP-10iT-Di8q-77YR-e4XlY7
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                8.09 GB
  Current LE             259
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
  --- Physical volumes ---
  PV Name               /dev/sda2     
  PV UUID               sqToLA-R3Tg-jfCN-NR1f-bLie-e7cD-wMzZLP
  PV Status             allocatable
  Total PE / Free PE    1276 / 80
   
  PV Name               /dev/sdb     
  PV UUID               2q1urp-b0VM-h7Pm-G0ZT-FpdQ-TrS5-bEzc9d
  PV Status             allocatable
  Total PE / Free PE    1279 / 1279

4，在线扩LV

[root@gc12r2 ~]# lvextend -L50G /dev/rootvg/rootlv 
  Extending logical volume rootlv to 50.00 GB
  Logical volume rootlv successfully resized

5，在线扩文件系统

如果是rhel 4版本的系统需要使用ext2online命令来实现。

[root@gc12r2 ~]# resize2fs  -p /dev/rootvg/rootlv 
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/rootvg/rootlv is mounted on /; on-line resizing required
Performing an on-line resize of /dev/rootvg/rootlv to 13107200 (4k) blocks.
The filesystem on /dev/rootvg/rootlv is now 13107200 blocks long.

[root@gc12r2 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/rootvg-rootlv
                       49G   22G   25G  48% /
/dev/sda1              99M   13M   82M  14% /boot
tmpfs                 3.9G     0  3.9G   0% /dev/shm
//192.168.111.1/install
                      932G  729G  204G  79% /sof

已经扩展成功。

下面是resize2fs命令的帮助手册

[root@gc12r2 ~]# man resize2fs
RESIZE2FS(8)                                                      RESIZE2FS(8)

NAME
       resize2fs - ext2/ext3 file system resizer

SYNOPSIS
       resize2fs [ -d debug-flags ] [ -S RAID-stride ] [ -f ] [ -F ] [ -p ] device [ size ]

DESCRIPTION
       The  resize2fs  program  will  resize  ext2  or ext3 file systems.  It can be used to enlarge or shrink an unmounted file system located on device.  If the filesystem is
       mounted, it can be used to expand the size of the mounted filesystem, assuming the kernel supports on-line resizing.  (As of this writing, the Linux 2.6 kernel  supports
       on-line resize for filesystems mounted using ext3 only.).

       The  size  parameter specifies the requested new size of the filesystem.  If no units are specified, the units of the size parameter shall be the filesystem blocksize of
       the filesystem.  Optionally, the size parameter may be suffixed by one of the following the units designators: ’s’, ’K’, ’M’, or ’G’, for 512  byte  sectors,  kilobytes,
       megabytes,  or  gigabytes,  respectively.   The  size  of the filesystem may never be larger than the size of the partition.  If size parameter is not specified, it will
       default to the size of the partition.

       The resize2fs program does not manipulate the size of partitions.  If you wish to enlarge a filesystem, you must first make sure you can expand the size of the  underly-
       ing  partition  first.   This can be done using fdisk(8) by deleting the partition and recreating it with a larger size or using lvextend(8), if you’re using the logical
       volume manager lvm(8).  When recreating the partition, make sure you create it with the same starting disk cylinder as before!  Otherwise, the resize operation will cer-
       tainly  not  work,  and  you  may  lose your entire filesystem.  After running fdisk(8), run resize2fs to resize the ext2 filesystem to use all of the space in the newly
       enlarged partition.

       If you wish to shrink an ext2 partition, first use resize2fs to shrink the size of filesystem.  Then you may use fdisk(8) to shrink the  size  of  the  partition.   When
       shrinking the size of the partition, make sure you do not make it smaller than the new size of the ext2 filesystem!

OPTIONS
       -d debug-flags
              Turns  on  various  resize2fs debugging features, if they have been compiled into the binary.  debug-flags should be computed by adding the numbers of the desired
              features from the following list:
                   1    - Print out all disk I/O
                   2    - Debug block relocations
                   8    - Debug inode relocations
                   16   - Debug moving the inode table

       -S RAID-stride
              The resize2fs program will heuristically determine the RAID stride that was specified when the filesystem was created.  This option allows the user to  explicitly
              specify a RAID stride setting to be used by resize2fs instead.

       -p     Prints out a percentage completion bars for each resize2fs operation, so that the user can keep track of what the program is doing.

       -f     Forces resize2fs to proceed with the filesystem resize operation, overriding some safety checks which resize2fs normally enforces.

       -F     Flush the filesystem device’s buffer caches before beginning.  Only really useful for doing resize2fs time trials.

AUTHOR
       resize2fs was written by Theodore Ts’o <tytso@mit.edu>.

COPYRIGHT
       Resize2fs is Copyright 1998 by Theodore Ts’o and PowerQuest, Inc.  All rights reserved.  As of April, 2000 Resize2fs may be redistributed under the terms of the GPL.

SEE ALSO
       fdisk(8), e2fsck(8), mke2fs(8), lvm(8), lvextend(8)

E2fsprogs version 1.39             May 2006                       RESIZE2FS(8)