使用bash -x 调试信息查看lvextend -r的调用

--1.打开调试：

[root@db01 storage]# set -x

--2.执行命令：

[root@db01 storage]# /usr/sbin/lvextend -r -L 710M /dev/shazam/storage

+ /usr/sbin/lvextend -r -L 710M /dev/shazam/storage

Rounding size to boundary between physical extents: 712.00 MiB.

Size of logical volume shazam/storage changed from 700.00 MiB (175 extents) to 712.00 MiB (178 extents).

Logical volume shazam/storage successfully resized.

resize2fs 1.42.9 (28-Dec-2013)

Filesystem at /dev/mapper/shazam-storage is mounted on /storage; on-line resizing required

old_desc_blocks = 6, new_desc_blocks = 6

The filesystem on /dev/mapper/shazam-storage is now 729088 blocks long.

++ __vte_prompt_command

+++ HISTTIMEFORMAT=

+++ history 1

+++ sed 's/^ *[0-9]\+ *//'

++ local 'command=/usr/sbin/lvextend -r -L 710M /dev/shazam/storage '

++ command='/usr/sbin/lvextend -r -L 710M /dev/shazam/storage '

++ local 'pwd=~'

++ '[' /storage '!=' /root ']'

++ pwd=/storage

+++ __vte_osc7

++++ __vte_urlencode /storage

++++ LC_ALL=C

++++ str=/storage

++++ '[' -n /storage ']'

++++ safe=/storage

++++ printf %s /storage

++++ str=

++++ '[' -n '' ']'

++++ '[' -n '' ']'

+++ printf '\033]7;file://%s%s\007' db01 /storage

++ printf '\033]777;notify;Command completed;%s\007\033]0;%s@%s:%s\007%s' '/usr/sbin/lvextend -r -L 710M /dev/shazam/storage ' root db01 /storage ''

--通过以上命令可以看到，在加了 -r 选项后，自动调用了 resize2fs

--3.关闭 调试信息

[root@db01 storage]# set -x

之后就没有信息调试信息了。