我刚创建了一个运行RHEL7的Amazon AWS EC2实例：
[root@ip-10-184-161-46 ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.0 (Maipo) [root@ip-10-184-161-46 ~]#@H_403_3@即使我选择10GB作为我的存储容量,无论出于何种原因我只能看到6GB可供我立即使用：
[root@ip-10-184-161-46 ~]# mount | grep xfs | grep -v selinux /dev/xvda1 on / type xfs (rw,relatime,seclabel,attr2,inode64,noquota) [root@ip-10-184-161-46 ~]# df -h | grep xvda /dev/xvda1 6.0G 2.2G 3.9G 37% / [root@ip-10-184-161-46 ~]# fdisk -l /dev/xvda Disk /dev/xvda: 10.7 GB,10737418240 bytes,20971520 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 Disk label type: dos Disk identifier: 0x0000b85c Device Boot Start End Blocks Id System /dev/xvda1 * 2048 12584959 6291456 83 Linux [root@ip-10-184-161-46 ~]#@H_403_3@这就是我所做的：
[root@ip-10-164-175-246 ~]# fdisk -l /dev/xvda Disk /dev/xvda: 10.7 GB,20971520 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 Disk label type: dos Disk identifier: 0x0000b85c Device Boot Start End Blocks Id System /dev/xvda1 * 2048 12584959 6291456 83 Linux /dev/xvda2 12584960 20971519 4193280 83 Linux [root@ip-10-164-175-246 ~]# xfs_growfs / Meta-data=/dev/xvda1 isize=256 agcount=4,agsize=393216 blks = sectsz=512 attr=2,projid32bit=1 = crc=0 data = bsize=4096 blocks=1572864,imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal bsize=4096 blocks=2560,version=2 = sectsz=512 sunit=0 blks,lazy-count=1 realtime =none extsz=4096 blocks=0,rtextents=0 [root@ip-10-164-175-246 ~]# df -h | grep xvda /dev/xvda1 6.0G 2.3G 3.8G 38% / [root@ip-10-164-175-246 ~]#@H_403_3@我的其他4GB在哪里？我以为运行xfs_growfs /会增加我的xfs分区的大小.
我究竟做错了什么？
解决方法
有趣的是,我在EC2上找到我的RHEL实例之后的另一天就完成了这一点,只有6GB左右的10GB空间分配给它…
[root@ip-172-31-20-177 ~]# xfs_info / Meta-data=/dev/xvda1 isize=256 agcount=4,rtextents=0@H_403_3@这里的问题是你创建了第二个分区.
相反,您应该调整第一个分区的大小.
因此,您将使用fdisk删除第二个分区,然后同时删除并重新创建第一个分区. fdisk默认值将使其填充磁盘(并正确对齐).
启动fdisk并删除分区：
[root@ip-172-31-20-177 ~]# fdisk /dev/xvda Welcome to fdisk (util-linux 2.23.2). Changes will remain in memory only,until you decide to write them. Be careful before using the write command. Command (m for help): p Disk /dev/xvda: 10.7 GB,20971520 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 Disk label type: dos Disk identifier: 0x0000b85c Device Boot Start End Blocks Id System /dev/xvda1 * 2048 12584959 6291456 83 Linux Command (m for help): d Selected partition 1 Partition 1 is deleted@H_403_3@现在使用所有默认值重新创建分区,这将最大化其大小：
Command (m for help): n Partition type: p primary (0 primary,0 extended,4 free) e extended Select (default p): p Partition number (1-4,default 1): First sector (2048-20971519,default 2048): Using default value 2048 Last sector,+sectors or +size{K,M,G} (2048-20971519,default 20971519): Using default value 20971519 Partition 1 of type Linux and of size 10 GiB is set Command (m for help): p Disk /dev/xvda: 10.7 GB,20971520 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 Disk label type: dos Disk identifier: 0x0000b85c Device Boot Start End Blocks Id System /dev/xvda1 2048 20971519 10484736 83 Linux@H_403_3@保存新分区表：
Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table Failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks.@H_403_3@重新启动时,应该通过cloud-init自动为您调整文件系统的大小.如果没有,您可以使用xfs_growfs /手动扩展文件系统.
[root@ip-172-31-20-177 ~]# xfs_info / Meta-data=/dev/xvda1 isize=256 agcount=7,projid32bit=1 = crc=0 data = bsize=4096 blocks=2621184,rtextents=0 [root@ip-172-31-20-177 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/xvda1 10474496 818560 9655936 8% /@H_403_3@
