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Date: Fri, 2 Mar 2012 11:51:39 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Subject: tunefs -j enable -S ...
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tried to do
tunefs -j enable -S 256M

on large and heavily used filesystem (instead of default 32M for 
softdep-journal).

works fine, until fsck needs to replay journal, when it needs