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El Yobo
Asked: 2011-01-30 23:02:01 +0800 CST

Linux RAID1, with reads restricted to one disk

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I'm looking for a way to replicate a all changes on a filesystem between two disks in a master->slave setup. One of the disks is much faster for reads, so I would like to direct all reads to this real disk for performance reasons; is it possible to do this with Linux software RAID? Is there a better approach?

linux software-raid raid1

1 Answers

  1. Best Answer

    man mdadm:

       -W, --write-mostly

    subsequent devices listed in a --build, --create, or --add command will be flagged as 'write-mostly'. This is valid for RAID1 only and means that the 'md' driver will avoid reading from these devices if at all possible. This can be useful if mirroring over a slow link.

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