http://www.jackxiang.com/index.php zh-cn http://www.jackxiang.com/post// jack <xdy108@126.com> Sat, 13 Apr 2013 05:37:53 +0000 http://www.jackxiang.com/post// -T, --print-type      print file system type
-h, --human-readable  print sizes in human readable format (e.g., 1K 234M 2G)
-H, --si              likewise, but use powers of 1000 not 1024

一、看分区的格式：
root@192.168.137.159:~# df -hT
文件系统    类型      容量  已用  可用 已用%% 挂载点
/dev/mapper/VolGroup-lv_root
              ext4     29G   23G  4.0G  86% /
tmpfs        tmpfs    250M     0  250M   0% /dev/shm
/dev/sda1     ext4    485M   38M  422M   9% /boot
.host:/     vmhgfs    100G   94G  5.6G  95% /mnt/hgfs
.host:/     vmhgfs    100G   94G  5.6G  95% /mnt/hgfs

二、加上-H显示用了多少：
[root@ZWCLC6X-7198 /]# df -hTH
文件系统    类型      容量  已用  可用 已用%% 挂载点
/dev/sda3     ext4      15G   3.2G    11G  24% /
tmpfs        tmpfs     3.1G      0   3.1G   0% /dev/shm
/dev/sda1     ext4     529M    45M   457M   9% /boot
/dev/sdb      ext4     101G   197M    96G   1% /data


三、ext4减少inode,mkfs.ext4格式化大容量磁盘:
减小inode总数，可以减小inode占用的磁盘空间，减少磁盘浪费。

例如：指定1m空间分配一个inode来格式化2TB磁盘
mkfs.ext4 -i 1048576 -n /dev/sdc  #1024*1024=1048576

mkfs.ext4有参数-i，可以指定：多大磁盘空间分配一个inode
man mkfs.ext4
-i bytes-per-inode
    Specify  the  bytes/inode ratio.
    mke2fs creates an inode for every bytes-per-inode bytes of space on the disk.
    The larger the bytes-per-inode ratio, the fewer inodes will be created.
    This value generally shouldn’t be smaller than the blocksize  of  the filesystem,
    since  in  that case more inodes would be made than can ever be used.
    Be warned that it is not possible to expand
    the number of inodes on a filesystem after it is created,
    so be careful deciding the correct value for this parameter.


From:https://www.cnblogs.com/micmouse521/p/8064568.html ]]> http://www.jackxiang.com/post//#blogcomment <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 http://www.jackxiang.com/post//#blogcomment