changing ext4 journal data mode with remount?

Posted by Amos Shapira on Server Fault See other posts from Server Fault or by Amos Shapira
Published on 2012-09-19T03:11:59Z Indexed on 2012/09/19 3:40 UTC
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Filed under:

linux

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mount

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ext4

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journal

I'm tweaking ext4 file system for speed, one tweak at a time. First tweak is to change from "data=ordered" to "data=writeback".

To test this, I execute "mount -n -o remount,data=ordered /" but I keep getting "mount: / not mounted already, or bad option".

From lots of google'ing I found many questions about similar problems and one answer circa 2001+ext3 which says that you can't change the journal mode with remount. Is this limitation still current?

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