1.本地存储设备的识别
查看本地设备信息有三种方法:
- fdisk -l ##真实存在的设备(不一定是系统识别)
- cat /proc/partitions #系统真实识别的设备
- blkid #系统可以使用的设备
[kiosk@foundation38 ~]$ fdisk -l
[kiosk@foundation38 ~]$ cat /proc/partitions
major minor #blocks name
8 0 312571224 sda
8 1 308636672 sda1
8 2 3933184 sda2
11 0 1048575 sr0
7 0 3763200 loop0
7 1 3655680 loop1
7 2 3704832 loop2
11 1 6010 sr1
[kiosk@foundation38 ~]$ blkid
/dev/sr1: UUID="2016-09-20-16-58-58-00" LABEL="M-eM-^MM-^NM-dM-8M-:M-fM-^IM-^KM-fM-^\M-:M-eM-^JM-)M-fM-^IM-^K" TYPE="iso9660" PTTYPE="mac"
df #系统正在挂载的设备,下面两个命令在容量大小方面会有差异
-h ##1K=1024
-H ##1K=1000
[kiosk@foundation38 ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 295G 75G 220G 26% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 536K 1.9G 1% /dev/shm
tmpfs 1.9G 8.9M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/loop0 3.6G 3.6G 0 100% /var/www/html/rhel6.5
/dev/loop1 3.5G 3.5G 0 100% /var/www/html/rhel7.0
tmpfs 384M 32K 384M 1% /run/user/1000
/dev/loop2 3.6G 3.6G 0 100% /var/www/html/rhel7.3
/dev/sr1 5.9M 5.9M 0 100% /run/media/kiosk/华为手机助手
[kiosk@foundation38 ~]$ df -H
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 316G 81G 236G 26% /
devtmpfs 2.0G 0 2.0G 0% /dev
tmpfs 2.1G 549k 2.1G 1% /dev/shm
tmpfs 2.1G 9.3M 2.1G 1% /run
tmpfs 2.1G 0 2.1G 0% /sys/fs/cgroup
/dev/loop0 3.9G 3.9G 0 100% /var/www/html/rhel6.5
/dev/loop1 3.8G 3.8G 0 100% /var/www/html/rhel7.0
tmpfs 403M 33k 403M 1% /run/user/1000
/dev/loop2 3.8G 3.8G 0 100% /var/www/html/rhel7.3
/dev/sr1 6.2M 6.2M 0 100% /run/media/kiosk/华为手机助手
umount出现设备正忙
解决方法一:
[kiosk@foundation38 ~]$ umount /dev/sr1
Error unmounting block device 11:1: GDBus.Error:org.freedesktop.UDisks2.Error.DeviceBusy: Error unmounting /dev/sr1: Command-line `umount "/run/media/kiosk/??????"' exited with non-zero exit status 32: umount: /run/media/kiosk/??????: target is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
[kiosk@foundation38 ~]$ fuser -vm /run/media/kiosk/华为手机助手
USER PID ACCESS COMMAND
/run/media/kiosk/华为手机助手:
root kernel mount /run/media/kiosk/华为手机助手
kiosk 13115 ..c.. bash
kiosk 13746 ..c.. vim
[kiosk@foundation38 ~]$ umount /dev/sr1 ##解除成功
![](/qrcode.jpg)
[root@foundation38 ~]# mount /dev/sr1 /mnt ##重新挂载
mount: /dev/sr1 is write-protected, mounting read-only
[root@foundation38 ~]# cd /mnt
[root@foundation38 mnt]# ls
Autorun.inf Document HiSuite.ico 华为手机助手安装向导.exe
解决方法二:
[root@foundation38 ~]# lsof /mnt
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
Output information may be incomplete.
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
gedit 14229 root cwd DIR 11,1 2048 1600 /mnt
[root@foundation38 ~]# kill -9 14229 ##删除对挂载地址/mnt中的占用
[root@foundation38 ~]# lsof /mnt/
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
Output information may be incomplete.
[1]+ Killed gedit (wd: /mnt)
(wd now: ~)
[root@foundation38 ~]# umount /mnt ##解除成功
操作系统
磁盘分区
1.磁盘0磁道第1扇区的512字节的内容
512=446+64+2
446:mbr(主引导记录)
64:mpt(主分区表)
2:磁盘有效性标示/
eg:对磁盘vdb进行第二个分区并分配500M的空间
[root@client138 ~]# cat /proc/partitions
major minor #blocks name253 0 10485760 vda
253 1 10484142 vda1
253 16 10485760 vdb
253 17 512000 vdb1
252 0 507904 dm-0
[root@client138 ~]# fdisk /dev/vdb ##分区配置
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): n ##分区
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): p
Partition number (2-4, default 2): ##第几个区
First sector (1026048-20971519, default 1026048): ##起始位置
Using default value 1026048
Last sector, +sectors or +size{K,M,G} (1026048-20971519, default 20971519): +500M ##分配大小
Partition 2 of type Linux and of size 500 MiB is setCommand (m for help): p ##查看
Disk /dev/vdb: 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: 0x09ee18d7Device Boot Start End Blocks Id System
/dev/vdb1 2048 1026047 512000 8e Linux LVM
/dev/vdb2 1026048 2050047 512000 83 LinuxCommand (m for help): wq ##保存
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.
[root@client138 /]# partprobe ##同步分区
[root@client138 /]# cat /proc/partitions
major minor #blocks name253 0 10485760 vda
253 1 10484142 vda1
253 16 10485760 vdb
253 17 512000 vdb1
253 18 512000 vdb2 ##操作成功,分出了vdb第二个区
252 0 507904 dm-0
[root@client138 /]# dd if=/dev/vdb of=/mnt/mbr2 bs=521 count=1 ##取出前512个位置的信息
1+0 records in
1+0 records out
521 bytes (521 B) copied, 0.000187945 s, 2.8 MB/s
[root@client138 /]# hexdump -C /mnt/mbr2
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000001b0 00 00 00 00 00 00 00 00 d7 18 ee 09 00 00 00 00 |................| ##描黑部分一共64位
000001c0 21 02 8e 0e de f9 00 08 00 00 00 a0 0f 00 00 01 |!...............| ##只能分四个区
000001d0 13 e8 83 09 5c cb 00 a8 0f 00 00 a0 0f 00 00 00 |....\...........|
000001e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|
00000200 00 00 00 00 00 00 00 00 00 |.........|
00000209
分完区后不能直接挂载或使用
[root@client138 ~]# mount /dev/vdb2 /mnt ##报错
mount: /dev/vdb2 is write-protected, mounting read-only
mount: unknown filesystem type '(null)'
文件系统
是操作系统用于明确磁盘或分区上的文件的方法和数据结构,即在磁盘上组织文件的方式
操作系统中负责管理和存储文件信息的软件机构称为文件管理系统(文件系统)
文件系统由三部分组成:与文件管理有关的软件,被管理的文件及实施文件管理所需的数据结构
从系统角度来看,文件系统就是对文件存储空间进行组织和分配,负责文件存储并对存入的文件进行保护和检索的系统
文件系统 | 适应的Linux版本 |
ext3 | rhel5之前的版本 |
ext4 | rhel6 |
xfs | rhel7 |
将文件系统赋予磁盘
mkfs.xfs /dev/vdb2
[root@client138 ~]# mkfs.xfs /dev/vdb2
meta-data=/dev/vdb2 isize=256 agcount=4, agsize=32000 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=128000, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@client138 ~]# mount /dev/vdb2 /mnt ##成功挂载[root@client138 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 10G 3.2G 6.9G 32% /
devtmpfs 459M 0 459M 0% /dev
tmpfs 474M 84K 474M 1% /dev/shm
tmpfs 474M 13M 462M 3% /run
tmpfs 474M 0 474M 0% /sys/fs/cgroup
/dev/mapper/vg0-vo 473M 2.4M 442M 1% /home
/dev/vdb2 497M 26M 472M 6% /mnt
开机自动挂载设备
因为又要用一下vdb2磁盘,所以将刚才的先解除挂载
[root@client138 ~]# umount /mnt
自动挂载的配置文件是/etc/fstab,这个比rc.local要快,内核启动时会优先读取
[root@client138 ~]# vim /etc/fstab
配置内容:
/dev/vdb2 | /mnt | xfs | defaults | 0 | 0 |
设备名称 | 挂载点 | 文件系统类型 | 挂载参数 | 是否备份 | 是否检测 |
[root@client138 ~]# mount -a ##挂载测试
[root@client138 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 10G 3.2G 6.9G 32% /
devtmpfs 459M 0 459M 0% /dev
tmpfs 474M 84K 474M 1% /dev/shm
tmpfs 474M 13M 462M 3% /run
tmpfs 474M 0 474M 0% /sys/fs/cgroup
/dev/mapper/vg0-vo 473M 2.4M 442M 1% /home
/dev/vdb2 497M 26M 472M 6% /mnt ##成功挂载
swap分区的管理
1.swap分区的建立
划分分区并设定分区的标签为82
[root@client138 ~]# fdisk /dev/vdb ##打开磁盘管理
Hex code (type L to list all codes): 82
Changed type of partition 'Linux' to 'Linux swap / Solaris'Command (m for help): p
Disk /dev/vdb: 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: 0x09ee18d7Device Boot Start End Blocks Id System
/dev/vdb1 2048 1026047 512000 8e Linux LVM
/dev/vdb2 1026048 2050047 512000 82 Linux swap / Solaris[root@client138 ~]# partprobe
设定swap分区
[root@client138 ~]# mkswap /dev/vdb2
Setting up swapspace version 1, size = 511996 KiB
no label, UUID=c99e2c2d-b3d6-4500-a92a-6d166ea008c3
[root@client138 ~]# swapon -a /dev/vdb2 ##让系统识别swap分区[root@client138 ~]# swapon -s ##查看系统中的swap分区
Filename Type Size Used Priority
/dev/vdb2 partition 511996 0 -1
开机自动挂载
编辑/etc/fstab文件,加入配置
/dev/vdb2 swap swap defaults 0 0
2.swap分区的删除
[root@client138 ~]# vim /etc/fstab ##首先删除开机自动挂载的设置
[root@client138 ~]# swapoff /dev/vdb2 ##解除vdb2的swap分区设置
[root@client138 ~]# swapon -s
磁盘的配额
磁盘vdb2已经配置过swap,首先需要解除标签并重新配置文件系统xfs
[root@client138 ~]# mkfs.xfs -f /dev/vdb2
meta-data=/dev/vdb2 isize=256 agcount=4, agsize=32000 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0
data = bsize=4096 blocks=128000, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@client138 ~]# mount -o usrquota /dev/vdb2 /pub ##加上配额参数进行挂载
[root@client138 ~]# edquota -u student ##配额配置文件
Filesystem blocks soft hard inodes soft hard
/dev/vdb2 0 0 40000 0 0 0
配置内容:
Filesystem | blocks | soft | hard | inodes | soft | hard |
/dev/vdb2 | 0 | 0 | 40000 | 0 | 0 | 0 |
设备 | 已存在文件 | 软限度 | 硬限度(最大额度) | 存在文件数量 | 软 | 硬 |
[root@client138 ~]# su - student
[student@client138 ~]$ dd if=/dev/zero of=/pub/student bs=1M count=21 ##当取出21M时很OK
21+0 records in
21+0 records out
22020096 bytes (22 MB) copied, 0.0126497 s, 1.7 GB/s
[student@client138 ~]$ dd if=/dev/zero of=/pub/student bs=1M count=40 ##取出超过40M时就会报错
dd: error writing ‘/pub/student’: Disk quota exceeded
40+0 records in
39+0 records out
40960000 bytes (41 MB) copied, 0.0491933 s, 833 MB/s