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Date:      Thu, 6 Oct 2011 10:21:57 +0100
From:      krad <kraduk@gmail.com>
To:        Jason Usher <jusher71@yahoo.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Parallel fscks on large filesystems ... wondering about maxdsiz setting...
Message-ID:  <CALfReyfqR3d_sBLUQ+DBBnmt7GmJva+rkjfHYvqc8XfNNJtGTQ@mail.gmail.com>
In-Reply-To: <1317839111.86728.YahooMailClassic@web121214.mail.ne1.yahoo.com>
References:  <1317839111.86728.YahooMailClassic@web121214.mail.ne1.yahoo.com>

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On 5 October 2011 19:25, Jason Usher <jusher71@yahoo.com> wrote:

> Old 6.4-RELEASE system.
>
> Two filesystems exist, each of which is on its own raid controller.
>
> (Background fsck is not workable for various reasons that are tl;dr.)
>
> So, theoretically, doing both fscks at the same time is workable, since
> each of them are on their own controller, and no disk/controller resources
> are shared.
>
> HOWEVER, due to the large size and dense inode usage, we are forced to set:
>
> kern.maxdsiz="4096000000"
>
> And my question is:
>
> If I run two fscks at the same time, do I need to up this to 8192000000,
> or is this a per-process limit and I can run several processes that big,
> while leaving the value at 4096000000 ?
>
> (16 GB of ram, so either way we're well below)
>
> Thanks!
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If this becomes a major issue for you why not upgrade to 9 when its out then
you can have softupdates with journaling and remove most cases where you
need to run fsck, or make the jump to zfs. zfs will obviously require a bit
more thought.



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