Linux查看系统块大小

Linux系统的块大小（Block Size）怎么查看呢？下面总结一些常用的查看块大小（block size）的方法。

方法1： fdisk -l查看block size

[root@KerryDB ~]# fdisk -l /dev/sda1

Disk /dev/sda1: 106 MB, 106896384 bytes, 208782 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 4096 bytes

I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Alignment offset: 512 bytes

方法2：stat命令查看block size

[root@KerryDB ~]# stat / | grep "IO Block"

  Size: 260             Blocks: 0          IO Block: 4096   directory

[root@KerryDB ~]# stat -f /

  File: "/"

    ID: fd0000000000 Namelen: 255     Type: xfs

Block size: 4096       Fundamental block size: 4096

Blocks: Total: 13100800   Free: 11998605   Available: 11998605

Inodes: Total: 26214400   Free: 26170926

方法3：tune2fs命令查看block size

[root@mylnx ~]# tune2fs -l /dev/sda1 | grep "Block size"

Block size:               1024

这里可以是/dev/sda1，对于LVM文件系统，可以使用下面命令

# tune2fs -l /dev/mapper/VolGroup04-LogVol00 | grep -i "block size"

Block size:               4096

方法4：blockdev命令查看block size

[root@KerryDB ~]# blockdev --getbsz /dev/sda2