课程第16次
2019-05-16BIOS+MBR的硬盘是不可能有第16个分区的：
Last login: Thu May 16 08:31:47 2019 from 192.168.0.165
# cat /proc/partitions
major minor#blocksname
8 0 20971520 sda
8 1 1048576 sda1
8 2 19921920 sda2
8 16 1048576 sdb
11 0 4391936 sr0
253 0 17821696 dm-0
253 1 2097152 dm-1
# ls -l /dev/sdb
brw-rw----. 1 root disk 8, 16 May 16 08:34 /dev/sdb
# fdisk /dev/sdb
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.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x01a7270d.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): e
Partition number (1-4, default 1): 3
First sector (2048-2097151, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-2097151, default 2097151):
Using default value 2097151
Partition 3 of type Extended and of size 1023 MiB is set
Command (m for help): p
Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 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: 0x01a7270d
Device Boot Start End Blocks IdSystem
/dev/sdb3 2048 2097151 1047552 5Extended
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
#
# fuser-mv /mnt
USER PID ACCESS COMMAND
/mnt: root kernel mount /mnt
root 16939 ..c.. bash
# umount/mnt
umount: /mnt: target is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
# fuser -kmv /mnt
USER PID ACCESS COMMAND
/mnt: root kernel mount /mnt
root 16939 ..c.. bash
# umount/mnt
目录的“硬链接”：
#
# /etc/fstab
# Created by anaconda on Tue Apr2 17:40:59 2019
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/rhel-root / xfs defaults 0 0
UUID=002844e7-703a-4d59-a501-4911b5508dcc /boot xfs defaults 0 0
/dev/mapper/rhel-swap swap swap defaults 0 0
UUID="a52e60db-23e4-447c-b7e8-2250eace2e1a" swap swap defaults 00
tmpfs /dev/shm tmpfs defaults,size=1500M 00
LABEL=yourdata /mnt ext4 defaults 00
/root/Videos /Videos2 bind bind0 0
~
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