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Linux系统dos分区表在线转为gpt并完成文件系统扩容

  • 2026-06-14 16:34:58
Linux系统dos分区表在线转为gpt并完成文件系统扩容
       某项目现场云平台服务器，配置了两块磁盘vda（系统盘）和vdb（数据盘）。vdb之前500G，创建了分区vdb1，格式化为ext4文件系统，挂载给/opt目录。目前vdb从500G扩容到4T，计划用于扩容/opt文件系统。
详情如图所示：
    确认磁盘当前分区表为dos格式。
知识点：dos分区表最大支持2T空间，GPT分区表可管理超过2T的空间。
    方案思路：
    1、把dos转为gpt，才能分配完目前4T空间，可使用gdisk命令解决。（前提条件是磁盘还有剩余空间未分配完才可正常转）
    2、/opt是ext4文件系统，扩容需要使用resize2fs命令解决
    3、/opt是vdb1分区挂载，所以需要把vdb1扩容到4T，可使用growpart命令解决。
实施步骤：
1、确认gdisk命令是否存在，下图打印已经存在。
2、确认growpart命令是否存在，同样显示已存在。如果没有安装，找对应系统的cloud-utils-growpart包。
3、修改dos为gpt分区表
执行gdisk /dev/vdb按照提示输入w和y即可
4、确认分区表变为gpt格式
5、扩容vdb1分区
把vdb剩余空间全部给vdb1并确认vdb从500G变成了4T。
growpart /dev/vdb   1   (b和1之间有空格)
6、扩容/opt文件系统并确认/opt已经变成4T
resize2fs /dev/vdb1
    到此，文件系统完成在线扩容。
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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000733s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000885s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000382s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000311s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000555s ]
  6. SELECT * FROM `set` [ RunTime:0.000214s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000625s ]
  8. SELECT * FROM `article` WHERE `id` = 498363 LIMIT 1 [ RunTime:0.003604s ]
  9. UPDATE `article` SET `lasttime` = 1783032235 WHERE `id` = 498363 [ RunTime:0.001004s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000273s ]
  11. SELECT * FROM `article` WHERE `id` < 498363 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000736s ]
  12. SELECT * FROM `article` WHERE `id` > 498363 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000542s ]
  13. SELECT * FROM `article` WHERE `id` < 498363 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005506s ]
  14. SELECT * FROM `article` WHERE `id` < 498363 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001349s ]
  15. SELECT * FROM `article` WHERE `id` < 498363 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.015004s ]
0.102029s