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1、原来linux不用LVM也能扩展文件系统以前总以为UNIX/LINUX使用了lvm才能扩展或缩小卷和文件系统，今天才发现我错了：即使没有lvm，linux也能扩展卷和及其相应的文件系统而不会丢失原有数据。以下是测试步骤，记录备查。1、系统是redhat linux 6rootlocalhost ku# uname -r2.6.32-131.0.15.el6.x86_64rootlocalhost ku# more /etc/redhat-releaseRed Hat Enterprise Linux Server release 6.1 (Santiago)rootlocalhost ku#2
2、、创建/dev/sdb1及其文件系统，创建文本文件rootlocalhost ku# echo welcome to redhat world rickyrootlocalhost ku# more rickywelcome to redhat world3、目前/dev/sdb1对应的文件系统/ku为1.2Grootlocalhost ku# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root 16G 3.7G 11G 25% /tmpfs 613M 88K 613M 1% /dev/shm/
3、dev/sda1 485M 32M 428M 7% /boot/dev/sdb1 1.2G 34M 1.1G 3% /ku4、卸载/kurootlocalhost ku# cd /rootlocalhost /# umount /kurootlocalhost /#5、用fdisk命令删除/dev/sdb1分区，然后重新创建/dev/sdb1分区，并指定大小为4Grootlocalhost /# fdisk /dev/sdbWARNING: DOS-compatible mode is deprecated. Its strongly recommended to switch off the
4、 mode (command c) and change display units to sectors (command u).Command (m for help): pDisk /dev/sdb: 5368 MB, 5368709120 bytes255 heads, 63 sectors/track, 652 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal):
5、512 bytes / 512 bytesDisk identifier: 0x54f7c6df Device Boot Start End Blocks Id System/dev/sdb1 1 393 3156741 83 LinuxCommand (m for help): dSelected partition 1Command (m for help): nCommand action e extended p primary partition (1-4)pPartition number (1-4): 1First cylinder (1-652, default 1):Usin
6、g default value 1Last cylinder, +cylinders or +sizeK,M,G (1-652, default 652): +4GCommand (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.rootlocalhost /#6、fdisk -l /dev/sdb输出可以看出，cylinder已经由393扩为523rootlocalhost /# fdisk -l /dev/sdbDisk /
7、dev/sdb: 5368 MB, 5368709120 bytes255 heads, 63 sectors/track, 652 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x54f7c6df Device Boot Start End Blocks Id System/dev/sdb
8、1 1 523 4200966 83 Linux7、先check文件系统rootlocalhost /# e2fsck -f /dev/sdb1e2fsck 1.41.12 (17-May-2010)Pass 1: Checking inodes, blocks, and sizesPass 2: Checking directory structurePass 3: Checking directory connectivityPass 4: Checking reference countsPass 5: Checking group summary information/dev/sdb
9、1: 12/73760 files (0.0% non-contiguous), 13234/307200 blocks8、将文件系统resize为2Grootlocalhost /# resize2fs /dev/sdb1 2Gresize2fs 1.41.12 (17-May-2010)Resizing the filesystem on /dev/sdb1 to 524288 (4k) blocks.The filesystem on /dev/sdb1 is now 524288 blocks long.rootlocalhost /# mount /dev/sdb1 /kurootl
10、ocalhost /# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root 16G 3.7G 11G 25% /tmpfs 613M 88K 613M 1% /dev/shm/dev/sda1 485M 32M 428M 7% /boot/dev/sdb1 2.0G 34M 1.9G 2% /kurootlocalhost /#9、检查扩容前的文件是否正确无损rootlocalhost /# cd /kurootlocalhost ku# more rickywelcome to redhat
11、worldrootlocalhost ku#10、当然也可以在线扩展文件系统rootlocalhost ku# resize2fs /dev/sdb1 2500Mresize2fs 1.41.12 (17-May-2010)Filesystem at /dev/sdb1 is mounted on /ku; on-line resizing requiredold desc_blocks = 1, new_desc_blocks = 1Performing an on-line resize of /dev/sdb1 to 640000 (4k) blocks.The filesystem o
12、n /dev/sdb1 is now 640000 blocks long.rootlocalhost ku# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup-lv_root 16G 3.7G 11G 25% /tmpfs 613M 88K 613M 1% /dev/shm/dev/sda1 485M 32M 428M 7% /boot/dev/sdb1 2.5G 34M 2.3G 2% /kurootlocalhost ku#11、但是不可以在线缩小；要缩小文件系统必须先卸载文件系统rootlocalho
13、st ku# resize2fs /dev/sdb1 1Gresize2fs 1.41.12 (17-May-2010)Filesystem at /dev/sdb1 is mounted on /ku; on-line resizing requiredOn-line shrinking from 640000 to 262144 not supported.rootlocalhost ku# cd /rootlocalhost /# umount /kurootlocalhost /# resize2fs /dev/sdb1 1Gresize2fs 1.41.12 (17-May-2010
14、)Please run e2fsck -f /dev/sdb1 first.rootlocalhost /# e2fsck -f /dev/sdb1e2fsck 1.41.12 (17-May-2010)Pass 1: Checking inodes, blocks, and sizesPass 2: Checking directory structurePass 3: Checking directory connectivityPass 4: Checking reference countsPass 5: Checking group summary information/dev/sdb1: 12/
