gdisk用法
gdisk - InteractiveGUIDpartitiontable (GPT) manipulator
GPTfdisk (akagdisk) isatext-modemenu-drivenprogramforcreationandmanipulation
ofpartitiontables.
1 使用gdisk的原因
（1）由於fdisk命令不能很好的支持GPT分區
[root@local ~]# fdisk /dev/sdb WARNING: fdiskGPTsupportiscurrentlynew, andthereforeinanexperimentalphase. Useatyourowndiscretion. Welcometofdisk (util-linux 2.23.2). Changeswillremaininmemoryonly, untilyoudecidetowritethem. Becarefulbeforeusingthewritecommand. Command (mforhelp):
而MBR分區不支持大於2T的分區，所有對於現在打的硬盤分區來說只能使用GPT分區，所以就要使用gdisk命令
（2）gdisk也可以處理MBR分區的硬盤，不管你硬盤多大，都不在話下。
2 用gdisk對硬盤就行分區，這里以vmware虛擬機為例
（1）查看為分區之前的磁盤信息，這里以/dev/sdc為例
[root@local ~]# gdisk -l /dev/sdd GPT fdisk (gdisk) version 0.8.6 Partition table scan: MBR: not present BSD: not present APM: not present GPT: not present Creating new GPT entries. Disk /dev/sdd: 10485760 sectors, 5.0 GiB Logical sector size: 512 bytes Disk identifier (GUID): 5ECA06B5-A105-4DCB-B6DD-96A13D0C1A93 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 10485726 Partitions will be aligned on 2048-sector boundaries Total free space is 10485693 sectors (5.0 GiB) Number Start (sector) End (sector) Size Code Name
當然也可用fdis命令查看
[root@local ~]# fdisk -l /dev/sdc Disk /dev/sdc: 5368 MB, 5368709120 bytes, 10485760 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
（2）gdisk命令對磁盤進行操作
[root@local ~]# gdisk /dev/sdc GPTfdisk (gdisk) version 0.8.6 Partitiontablescan: MBR: notpresent BSD: notpresent APM: notpresent GPT: notpresent CreatingnewGPTentries. Command (? forhelp):
（3）根據提示，輸入？獲得幫助
Command (? forhelp): ? b backupGPTdatatoafile c changeapartition'sname d deleteapartition #刪除分區 i showdetailedinformationonapartition l listknownpartitiontypes #列出分區類型 n addanewpartition #添加新分區 o createanewemptyGUIDpartitiontable (GPT) p printthepartitiontable #打印分區列表 q quitwithoutsavingchanges #不保存退出 r recoveryandtransformationoptions (expertsonly) s sortpartitions t changeapartition'stypecode #修改分區類型 v verifydisk w writetabletodiskandexit #保存退出 x extrafunctionality (expertsonly) ? printthismenu
（4）添加一個新分區
Command (? forhelp): n
Partitionnumber (1-128, default 1): 1 #輸入分區編號，默認為1，因為是/dev/sdc硬盤的第一塊分區。
Firstsector (34-10485726, default = 2048) or {+-}size{KMGTP}: #輸入扇區的開始位置，選擇默認即可，也可手動指定。
Lastsector (2048-10485726, default = 10485726) or {+-}size{KMGTP}:+2G #輸入扇區的結束位置，當然一般都是指定磁盤大小，這里輸入+2G表示新分區大小為2G。
Currenttypeis 'Linuxfilesystem'
HexcodeorGUID (Ltoshowcodes, Enter = 8300): #指定文件系統，默認即可，分區完成后可以修改。
Changedtypeofpartitionto 'Linuxfilesystem'
（5）查看分區后的分區列表
Command (? forhelp): p #查看分區列表 Disk /dev/sdc: 10485760 sectors, 5.0 GiB Logicalsectorsize: 512 bytes Diskidentifier (GUID): 428D4D72-0C16-4AD6-80A3-7BCACED6F40C Partitiontableholdsupto 128 entries Firstusablesectoris 34, lastusablesectoris 10485726 Partitionswillbealignedon 2048-sectorboundaries Totalfreespaceis 6291389 sectors (3.0 GiB) NumberStart (sector) End (sector) SizeCodeName 1 2048 4196351 2.0 GiB 8300 Linuxfilesystem #看到分區已經添加成功
（6）保存分區並退出
Command (? forhelp):w Finalcheckscomplete. AbouttowriteGPTdata. THISWILLOVERWRITEEXISTING PARTITIONS!! Doyouwanttoproceed? (Y/N): y OK; writingnewGUIDpartitiontable (GPT) to /dev/sdc. Theoperationhascompletedsuccessfully.
可以看到分區以添加成功
3 創建文件系統
[root@local ~]# mkfs.xfs /dev/sdc1 meta-data=/dev/sdc1 isize=512 agcount=4, agsize=131072 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0, sparse=0 data = bsize=4096 blocks=524288, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal log bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0
到此分區、文件系統創建成功，通過掛載就可以使用磁盤了