/dev/dm-N、 /dev/mpath/mpathN、/dev/mapper/mpathN的区别

最新推荐文章于 2022-09-20 18:59:16 发布

Perry705

最新推荐文章于 2022-09-20 18:59:16 发布

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分类专栏： LINUX&UNIX

本文链接：https://blog.youkuaiyun.com/u011616400/article/details/42583253

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本文深入探讨了当设备被设备映射器多路径控制时，新多路径设备如何在 /dev 目录下以 /dev/dm-N、/dev/mapper/mpathN 和 /dev/mpath/mpathN 的形式出现，并详细解释了这些设备的性质与用途。

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When devices are brought under the control of device-mapper-multipath the new multipathed devices can be seen in three different places under the /dev directory: /dev/dm-N, /dev/mapper/mpathN and /dev/mpath/mpathN.

   ---The /dev/dm-N devices are internal to device mapper and should never be used. These devices are not persistent. Starting with Red Hat Enterprise Linux 5, these devices are no longer created by udev.
   ---The /dev/mpath/mpathN devices are provided so that all the multipathed devices can be seen in one place. However, these device nodes may not be created on boot before the system needs to access them. Therefore they should not be used for creating logical volumes or filesystems.
   ---The /dev/mapper/mpathN devices are persistent and they are created early in the boot process. Therefore these are the device names that should be used to access the multipathed devices.