Linux查看硬盘信息命令(lsblk,df,fdisk)详解
lsblk
lsblk 命令用来查看接入到系统中的块设备，默认输出分区、大小、挂载点等信息，一目了然：
$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda 253:0 0 40G 0 disk
└─vda1 253:1 0 40G 0 part /
vdb 253:16 0 500G 0 disk
└─vdb1 253:17 0 500G 0 part
└─dsp--disk01-dsp--adx 252:0 0 499G 0 lvm /Data
vdc
df
df 命令用来查看硬盘的使用情况，经常配合 -h 给出友好的输出：
$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 40G 6.3G 32G 17% /
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 456K 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/dsp--disk01-dsp--adx 499G 5.9G 493G 2% /Data
tmpfs
需要注意的是 df 只能输出已挂载的磁盘分区信息，不能显示未挂载的硬盘。
另一个相似的命令是 du，用来显示占用的硬盘空间，例如统计当前目录下文件大小：du -sh *
fdisk
fdisk 是常用的硬盘、分区操作工具，需要 root 权限执行，-l 参数可以打印硬盘信息：
$ fdisk -l
Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 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: 0x000a5a8a
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 83886079 41942016 83 Linux
Disk /dev/vdb: 107.4 GB, 107374182400 bytes, 209715200 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: 0x4dcd9f83
Device Boot Start End Blocks Id System
/dev/vdb1 2048 209715199 104856576 83 Linux
fdisk 不支持 GPT 分区，需要要到下文的 parted 查看。
parted
parted 是一个分区操作工具，需要 root 权限，否则输出为空：
$ parted -l
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 42.9GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 42.9GB 42.9GB primary xfs boot
Model: Virtio Block Device (virtblk)
Disk /dev/vdb: 107GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 107GB 107GB primary ext4
lsscsi
lsscsi 可以打印 SCSI 硬盘信息，该命令在 Ubuntu 中默认没有安装：
$ lsscsi
[0:0:0:0] cd/dvd PLDS DVD+-RW DH-16ACS JD11 /dev/sr0
[6:0:0:0] disk HITACHI HUS156060VLS600 E516 /dev/sda
[6:0:1:0] disk HITACHI HUS156060VLS600 E516 /dev/sdb
[6:0:2:0] disk SEAGATE ST2000NM0023 0003 /dev/sdc
blkid
blkid 命令可以打印块设备的信息：
$ blkid
/dev/vda1: UUID="4fb2f21e-8b37-4461-9163-eced787a0565" TYPE="xfs"
/dev/vdb1: UUID="76c15e1b-37bb-4fa0-b1c0-3dc1884ae23a" TYPE="ext4"
lshw
lshw 命令用来打印硬件的详细信息，打印硬盘信息需要 root 权限：
$ lshw -class disk
*-disk:0
description: SCSI Disk
product: HUS156060VLS600
vendor: HITACHI
physical id: 0.0.0
bus info: scsi@6:0.0.0
logical name: /dev/sda
version: E516
serial: LXWMTVTM
size: 558GiB (600GB)
capacity: 690GiB (741GB)
capabilities: 15000rpm partitioned partitioned:dos
configuration: ansiversion=6 logicalsectorsize=512 sectorsize=512 signature=df3a7994
*-disk:1
description: SCSI Disk
product: HUS156060VLS600
vendor: HITACHI
physical id: 0.1.0
bus info: scsi@6:0.1.0
logical name: /dev/sdb
version: E516
serial: LXWMTWAM
size: 558GiB (600GB)
capacity: 690GiB (741GB)
capabilities: 15000rpm partitioned partitioned:dos
configuration: ansiversion=6 logicalsectorsize=512 sectorsize=512 signature=0006c4c0
*-cdrom
description: DVD-RAM writer
product: DVD+-RW DH-16ACS
vendor: PLDS
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/cdrom
logical name: /dev/cdrw
logical name: /dev/dvd
logical name: /dev/dvdrw
logical name: /dev/sr0
version: JD11
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: ansiversion=5 status=nodisc
exportfs
exportfs 命令用来查看 NFS 共享文件夹，需要 root 权限：
$ exportfs -s
/work 192.168.1.12(rw,wdelay,no_root_squash,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)
/work 192.168.1.13(rw,wdelay,no_root_squash,no_subtree_check,sec=sys,rw,secure,no_root_squash,no_all_squash)
/opt 192.168.1.12(ro,wdelay,no_root_squash,no_subtree_check,sec=sys,ro,secure,no_root_squash,no_all_squash)
/opt 192.168.1.13(ro,wdelay,no_root_squash,no_subtree_check,sec=sys,ro,secure,no_root_squash,no_all_squash)
mount
mount 命令常用来挂载硬盘、分区等，自然也就可以查看挂载信息：
$ mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,size=3993864k,nr_inodes=998466,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_prio,net_cls)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
configfs on /sys/kernel/config type configfs (rw,relatime)
/dev/vda1 on / type xfs (rw,relatime,attr2,inode64,noquota)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
mqueue on /dev/mqueue type mqueue (rw,relatime)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)
/dev/vdb1 on /jddata1 type ext4 (rw,relatime,data=ordered)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=800940k,mode=700,uid=1000,gid=1000)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=800940k,mode=700)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=40,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=165670537)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,relatime)
