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Linux运维必用 lsblk实战:比fdisk 好用十倍,排查磁盘全靠它

  • 2026-06-28 10:44:34
Linux运维必用 lsblk实战:比fdisk 好用十倍,排查磁盘全靠它

做linux运维的都知道,磁盘问题是日常高频故障:新增磁盘识别不到、分区忘记挂载、磁盘爆满找不到闲置盘---这些问题几乎每天都在困扰我们。

很多人第一反应敲fdisk -l,但输出密密麻麻一堆扇区、分区表,硬盘和分区的从属关系看得头昏。而lsblk是绝大多数发行版自自带的块设备查看工具,无需root权限就能运行,树形结构一眼分清硬盘-分区-lvm-挂载目录,是日常硬盘故障排除的必备工具。

一、lsblk的核心功能

lsblk全称list block devices,意思就是列出所有块设备,包含机械盘、ssd、u 盘、swap分区、lvm逻辑卷、镜像loop设备。对比两个常用磁盘命令,优势一目了然:

fdisk:需要sudo,只看分区表,层级不直观,不显示挂载路径;

df:只展示已挂载分区,看不到没挂载的新硬盘、空闲分区;

lsblk:不用管理员权限,树形展示父子关系,已挂载或未挂载全部显示,还能看文件系统、uuid、磁盘介质类型。

直接输入命令,不加任何参数就能查看全貌:

lsblk

输出字段通俗解读

  • NAME:设备名,sda第一块物理硬盘,sda1是它下面第一个分区;各种云服务器常见vda
  • RM:1=可移动设备(U 盘、光驱 sr0),0=本地硬盘
  • SIZE:磁盘/分区容量,自动 G/M 单位,不用换算字节
  • RO:只读设备,正常硬盘都是0
  • TYPE:disk 物理盘、part 分区、lvm 逻辑卷、swap 交换分区
  • MOUNTPOINT:挂载目录,空白=未挂载;SWAP代表交换分区
二、常用实战参数

1.lsblk -f 运维最常用:查看文件系统 + UUID

新增硬盘挂载、修改/etc/fstab开机自动挂载,会用到分区uuid:

lsblk -f

输出会新增fstype文件系统(xfs/ext4)、uuid、label磁盘标签。

应用场景:挂载数据盘时复制uuid写入 fstab,避免服务器重启磁盘序号变动导致开机失败。

#uuid也可以通过blkid来查看blkid |grep sdx

也可以通过以下命令查看uuid

lsblk -o NAME,SIZE,TYPE,UUID,MOUNTPOINT

2. lsblk -d只看物理硬盘,过滤所有分区

有时候服务器加装硬盘后,我们只想统计有几块物理盘,忽略sda1、lvm逻辑卷这些子设备:

lsblk -d#自定义输出列lsblk -d -o NAME,SIZE,MODEL,ROTA

ROTA字段:0=SSD固态硬盘,1=机械硬盘,快速区分磁盘介质;

-o 自定义输出列,只保留自己需要的信息,界面干净。

3. lsblk 设备名 单独查看单块硬盘详情
服务器多块硬盘,只排查 /dev/sdb 这块新增数据盘:
lsblk /dev/sdb

树形只展示 sdb 自身以及下面所有分区,无需在一大堆设备里翻找。

4. lsblk -l 列表模式,去掉树形符号

脚本里调用lsblk抓取磁盘名称,树形竖线会干扰文本处理,用-l平铺输出:

lsblk -l

5. lsblk -b 字节显示容量,用于容量精确统计

默认是GB、MB近似值,需要精确字节计算磁盘总容量时使用:

lsblk -b

三、lsblk实战总结

场景 1:新挂载物理硬盘或云盘,确认系统是否识别

机房加装硬盘、云服务器扩容数据盘后,不用重启机器,直接执行lsblk。

输出出现sdb/vdb这类disk设备:系统已识别硬件,直接分区格式化;

看不到新增磁盘:检查虚拟机磁盘配置、硬盘数据线、raid卡。同时找出未挂载空闲分区:

lsblk -o NAME,SIZE,FSTYPE,MOUNTPOINT | grep -v /

MOUNTPOINT为空的分区,就是闲置待挂载磁盘。

场景 2:磁盘空间爆满,判断是否有未挂载大容量分区

df -h看到根目录占满,但是服务器配置标注有500G数据盘,df却看不到。

执行lsblk,如果存在sdb且挂载点空白,说明硬盘存在但没挂载,格式化挂载后扩容存储。

场景 3:区分ssd和机械盘,做数据库性能优化

对于数据库等对读写要求较高的业务推荐放ssd固态硬盘,批量服务器排查磁盘介质:
lsblk -d -o NAME,SIZE,ROTA | grep disk

ROTA=0的磁盘分配给mysql、redis,提升io性能。

场景 4:LVM 逻辑卷扩容,梳理磁盘层级

很多系统默认lvm分区,根分区空间不足需要扩容。lsblk树形能清晰看到:物理硬盘 sda2→卷组os→逻辑卷root,不用再用 pvdisplay、vgdisplay 多条命令来回切换。

场景 5:制作开机自动挂载fstab,复制分区uuid

步骤:

  1. lsblk -f找到数据分区uuid;
  2. 编辑/etc/fstab 写入uuid、挂载目录、文件系统;
  3. mount -a 校验配置不报错,重启自动挂载。
四、注意事项
  • lsblk 普通用户就能运行,部分硬盘型号、厂商信息需要加sudo;
  • sr0是光驱设备,日常存储排查可以忽略;
  • loop循环设备是镜像挂载产生,大量残留loop占用空间可以清理;
  • ro只读磁盘多是光盘、写保护u盘,服务器硬盘出现 ro=1大概率磁盘故障。
五、总结

日常磁盘排查优先lsblk,替代老旧fdisk,不管是云服务器运维、物理机房维护,这条命令上手零门槛,树形输出直观易懂。如果觉得文章对你的运维工作有帮助,记得点赞加关注。

#运维#linux运维#linux实战#lsblk

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  1. CONNECT:[ UseTime:0.000745s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000823s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000300s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000519s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000543s ]
  8. SELECT * FROM `article` WHERE `id` = 501351 LIMIT 1 [ RunTime:0.000462s ]
  9. UPDATE `article` SET `lasttime` = 1783037420 WHERE `id` = 501351 [ RunTime:0.007187s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000291s ]
  11. SELECT * FROM `article` WHERE `id` < 501351 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000552s ]
  12. SELECT * FROM `article` WHERE `id` > 501351 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000812s ]
  13. SELECT * FROM `article` WHERE `id` < 501351 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001696s ]
  14. SELECT * FROM `article` WHERE `id` < 501351 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001218s ]
  15. SELECT * FROM `article` WHERE `id` < 501351 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003653s ]
0.095603s