centos下使用fdisk擴展分區容量大小

centos下使用fdisk擴展分區容量大小

擴展磁盤空間

硬盤空間為20G，使用vSphere Client增加磁盤大小，需要再增加10G空間;

擴展完後，重啟系統，再次使用fdisk -l查看，會發現硬盤空間變大了；

[root@linuxprobe~]#fdisk-lDisk/dev/sda:32.2GB,32212254720bytes255heads,63sectors/track,3916cylindersUnits=cylindersof16065*512=8225280bytesSectorsize(logical/physical):512bytes/512bytesI/Osize(minimum/optimal):512bytes/512bytesDiskidentifier:0x0005210cDeviceBootStartEndBlocksIdSystem/dev/sda1*12620480083LinuxPartition1doesnotendoncylinderboundary./dev/sda22613011024000083Linux/dev/sda313011497157286482Linuxswap/Solaris/dev/sda414972611895283283Linux[root@linuxprobe~]#df-hTFilesystemTypeSizeUsedAvailUse%Mountedon/dev/sda2ext49.7G1.5G7.7G16%/tmpfstmpfs939M0939M0%/dev/shm/dev/sda1ext4194M34M151M19%/boot/dev/sda4ext48.5G148M7.9G2%/data

重新創建分區，調整分區信息

本次實驗主要對/dev/sda4這個分區擴展，如果是生產環境，請提前做好備份保存到其他分區，雖然擴展分區大小不會導致數據丟失，安全起見，請提前做好備份；
首先模擬出一些數據：

[root@linuxprobedata]#mkdirtest[root@linuxprobedata]#echo"weareLinuxer">linuxprobe[root@linuxprobedata]#lltotal24-rw-r--r--.1rootroot15May2321:59linuxprobedrwx------.2rootroot16384May2315:07lost+founddrwxr-xr-x.2rootroot4096May2321:51test[root@linuxprobe~]#umount/dev/sda4#卸載磁盤分區

若提示磁盤忙，使用fuser找出將正在使用磁盤的程序並結束掉；

fuser-m-v/datafuser-m-v-i-k/data

使用fdisk工具先刪除/dev/sda4分區，然後創建新分區，注意開始的磁柱號要和原來的一致（是保證數據不丟失的關鍵步驟），結束的磁柱號默認回車使用全部磁盤。

[root@linuxprobe~]#fdisk/dev/sdaWARNING:DOS-compatiblemodeisdeprecated.It'sstronglyrecommendedtoswitchoffthemode(command'c')andchangedisplayunitstosectors(command'u').Command(mforhelp):p#查看分區表信息Disk/dev/sda:32.2GB,32212254720bytes255heads,63sectors/track,3916cylindersUnits=cylindersof16065*512=8225280bytesSectorsize(logical/physical):512bytes/512bytesI/Osize(minimum/optimal):512bytes/512bytesDiskidentifier:0x0005210cDeviceBootStartEndBlocksIdSystem/dev/sda1*12620480083LinuxPartition1doesnotendoncylinderboundary./dev/sda22613011024000083Linux/dev/sda313011497157286482Linuxswap/Solaris/dev/sda414972611895283283LinuxCommand(mforhelp):d#刪除分區Partitionnumber(1-4):4#刪除第四個Command(mforhelp):p#再次查看分區信息，/dev/sda4已被刪除Disk/dev/sda:32.2GB,32212254720bytes255heads,63sectors/track,3916cylindersUnits=cylindersof16065*512=8225280bytesSectorsize(logical/physical):512bytes/512bytesI/Osize(minimum/optimal):512bytes/512bytesDiskidentifier:0x0005210cDeviceBootStartEndBlocksIdSystem/dev/sda1*12620480083LinuxPartition1doesnotendoncylinderboundary./dev/sda22613011024000083Linux/dev/sda313011497157286482Linuxswap/SolarisCommand(mforhelp):n#創建新的分區Commandactioneextendedpprimarypartition(1-4)p#創建為主分區Selectedpartition4Firstcylinder(1497-3916,default1497):#經對比，正好和上一個磁盤柱一致，默認即可Usingdefaultvalue1497Lastcylinder,+cylindersor+size{K,M,G}(1497-3916,default3916):Usingdefaultvalue3916#直接默認就可以Command(mforhelp):p#查看分區表信息Disk/dev/sda:32.2GB,32212254720bytes255heads,63sectors/track,3916cylindersUnits=cylindersof16065*512=8225280bytesSectorsize(logical/physical):512bytes/512bytesI/Osize(minimum/optimal):512bytes/512bytesDiskidentifier:0x0005210cDeviceBootStartEndBlocksIdSystem/dev/sda1*12620480083LinuxPartition1doesnotendoncylinderboundary./dev/sda22613011024000083Linux/dev/sda313011497157286482Linuxswap/Solaris/dev/sda4149739161943658283LinuxCommand(mforhelp):wp#保存並退出，如果創建有誤，直接退出不要保存即可Thepartitiontablehasbeenaltered!Callingioctl()tore-readpartitiontable.WARNING:Re-readingthepartitiontablefailedwitherror16:Deviceorresourcebusy.Thekernelstillusestheoldtable.Thenewtablewillbeusedatthenextrebootorafteryourunpartprobe(8)orkpartx(8)Syncingdisks.

重新創建分區後，需要重啟一下；

[root@linuxprobe~]#init6[root@linuxprobe~]#e2fsck-f/dev/sda4#檢查分區信息[root@linuxprobe~]#resize2fs-p/dev/sda4#調整分區大小

重新掛載、查看分區大小、數據

[root@linuxprobe~]#mount/dev/sda4/data[root@linuxprobe~]#df-hT[root@linuxprobe~]#cat/data/linuxprobeweareLinuxer