bin/111146: fsck fails on 6Tfilesystem
Jan Srzednicki
w at wrzask.pl
Mon Apr 9 20:40:12 UTC 2007
The following reply was made to PR bin/111146; it has been noted by GNATS.
From: Jan Srzednicki <w at wrzask.pl>
To: Dan D Niles <dan at more.net>
Cc: bug-followup at FreeBSD.org
Subject: Re: bin/111146: fsck fails on 6Tfilesystem
Date: Mon, 9 Apr 2007 22:39:52 +0200
On Mon, Apr 09, 2007 at 03:30:23PM -0500, Dan D Niles wrote:
> On Mon, 2007-04-09 at 22:13 +0200, Jan Srzednicki wrote:
> > That's kinda strange, dumpfs never did that to me. It appears to me
> > that
> > this filesystem has got quite severely corrupted. Did you try newfs on
> > it?
>
> Not yet. I'd like to figure out why I can't fsck it first. Running
> newfs on your backup disk is not a viable solution. There is data I
> cannot pull of the disk. If my primary storage had crashed also, I'd be
> hosed.
Well, you need to take into the account that your data may be hosed.
Backup your primary storage NOW. :)
> > And another thing: try tuning up the -i, -f and -b parameters to
> > newfs.
> > I assume that on such a big filesystem average filesize will be much
> > bigger than the "UNIX default" (10k), so you can safely set these to
> > their maximums (and allocate inodes more scarcely).
>
> Running df reports 8683374 inodes used and 784218256 free. This could
> be wrong since the filesystem is dirty and mounted ro.
>
> FreeBSD's newfs scales things automatically, though perhaps not enough:
It does not scale anything. Last time I checked (a few years ago) even
the -g option did not make any difference either, so I had to tune
things up manually with -i, -f and -b.
> tunefs: maximum blocks per file in a cylinder group: (-e) 2048
> tunefs: average file size: (-f) 16384
> tunefs: average number of files in a directory: (-s) 64
> tunefs: minimum percentage of free space: (-m) 8%
> tunefs: optimization preference: (-o) time
These are the default values for any filesystem, regardles of it's size.
--
Jan Srzednicki :: http://wrzask.pl/
"Remember, remember, the fifth of November"
-- V for Vendetta
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