From: tim.newsham@gmail.com (Tim Newsham)
Subject: [TUHS] shutdown for pre-v7 unix
Date: Thu, 17 Jul 2014 16:52:01 -1000 [thread overview]
Message-ID: <CAGSRWbjWcm3oX9qhKJvA0V88J_L2J1B_kq9fFmS9a1dah7Tmvw@mail.gmail.com> (raw)
In-Reply-To: <2DF13A78-6D26-4E01-A65A-7746A51F44FB@ronnatalie.com>
One sync for the disks and two for the operator's peace of mind...
On Thu, Jul 17, 2014 at 4:26 PM, Ronald Natalie <ron at ronnatalie.com> wrote:
>
> On Jul 17, 2014, at 4:16 PM, Clem Cole <clemc at ccc.com> wrote:
>
> I think that's is a problem in that it needs to be data blocks, inodes, and
> finally superblocks to do the least damage in a crash.
>
>
> That is definitely the case and that was perhaps the biggest fix in BSD (and
> other later) was to make the file system writing more consistent so at least
> you didn't get trashed filesystems but at worst got some orphaned blocks
> that needed intervention to reclaim.
>
> It was mandatory for operators at JHU to understand how the file system was
> laid out on disk, and what icheck/dcheck reported and what the options to
> fix things. Link counts that were too low and dups in free should NEVER
> happen with an intelligently ordered set of I/O operations, but thats not
> what Version 6 UNIX had. It wasn't uncommon to find several errors in the
> file system that would be degenerate system faults if not corrected.
>
> But all that aside, even in those shakey days, typing sync multiple times
> really didn't accomplish anything and it because less useful as the file
> systems became more stable.
>
>
>
> _______________________________________________
> TUHS mailing list
> TUHS at minnie.tuhs.org
> https://minnie.tuhs.org/mailman/listinfo/tuhs
>
--
Tim Newsham | www.thenewsh.com/~newsham | @newshtwit | thenewsh.blogspot.com
next prev parent reply other threads:[~2014-07-18 2:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-16 18:55 Mark Longridge
2014-07-16 20:52 ` Brantley Coile
2014-07-17 2:29 ` Win Treese
2014-07-16 21:12 ` Dave Horsfall
2014-07-16 21:23 ` Dave Horsfall
2014-07-17 2:09 ` Dan Stromberg
2014-07-17 15:58 ` Warner Losh
2014-07-17 16:15 ` Clem Cole
2014-07-17 18:04 ` Ronald Natalie
2014-07-17 20:16 ` Clem Cole
2014-07-18 2:26 ` Ronald Natalie
2014-07-18 2:52 ` Tim Newsham [this message]
2014-07-18 2:58 ` Milo Velimirovic
2014-07-18 3:42 ` Warner Losh
2014-07-16 19:47 Noel Chiappa
2014-07-17 2:40 Norman Wilson
2014-07-17 3:55 Noel Chiappa
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