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Date: Mon, 02 Mar 2015 20:41:18 -0500
From: George Rosamond <george@ceetonetechnology.com>
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Subject: Re: disabling journaling?
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George Rosamond:
> Ian mentioned softupdates + journaling is a problem.
> 
> https://marc.info/?l=freebsd-arm&m=142526289401012&w=2
> 
>> IMO, there's your problem right there.  People have been reporting for
>> years that softupdates + journaling = corruption.  The freebsd project's
>> collective response to all those reports has been a rather silent yawn.
>> The only sane response, IMO, is to not use journaling.
> 
> Should crochet be adjusted for it in lib/disk.sh?
> 
>     # Turn on Softupdates
>     tunefs -n enable ${NEW_UFS_DEVICE}
>     # Turn on SUJ with a minimally-sized journal.
>     # This makes reboots tolerable if you just pull power
>     # Note:  A slow SDHC reads about 1MB/s, so a 30MB
>     # journal can delay boot by 30s.
>     tunefs -j enable -S 4194304 ${NEW_UFS_DEVICE}
>     # Turn on NFSv4 ACLs
>     tunefs -N enable ${NEW_UFS_DEVICE}
> 
> I assume journaling should go first. Besides in build scripts, don't
> know how this would be done a system for the root partition when you
> can't go into single-user mode.

Let me qualify that.  Should journaling be disabled by default on flash
media?  This wouldn't necessarily apply to all Crochet builds.

g