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Date:      Sun, 11 Dec 2011 00:23:48 +0000
From:      RW <rwmaillists@googlemail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: 9.0 install and journaling
Message-ID:  <20111211002348.56497fde@gumby.homeunix.com>
In-Reply-To: <4EE3DA85.4070903@herveybayaustralia.com.au>
References:  <4EE32BB6.3020105@herveybayaustralia.com.au> <alpine.BSF.2.00.1112100755520.11994@wonkity.com> <4EE38454.3020307@otenet.gr> <4EE3D1F0.60500@herveybayaustralia.com.au> <alpine.BSF.2.00.1112101509220.14596@wonkity.com> <4EE3DA85.4070903@herveybayaustralia.com.au>

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On Sun, 11 Dec 2011 08:17:41 +1000
Da Rock wrote:


> > SUJ speeds up the check a lot, seconds as opposed to minutes.  If 
> > something happens to the journal, it falls back to a standard fsck.
> But fsck needs to be run manually- I have users that can't do that,
> and the filesystem corrupts. Ergo gjournal; it boots up and fixes on
> the fly. So SU+J needs a manual fsck before booting proper or can it
> just boot and be done?

It's not very different; gjournal and SU both attempt to leave the
filesystem in an coherent state, but both still need a preen to
recover lost space. In either case the preen can fail requiring a full
fsck.

Journalled SU make SU behave more like gjournal in that you can do a
fast foreground check which avoids the lengthy background fsck and
avoids deferring the handling of unexpected inconsistencies to the next
boot.



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