[TUHS] shutdown for pre-v7 unix

Warner Losh imp at bsdimp.com
Fri Jul 18 13:42:18 AEST 2014

One sync to rule them all, One sync to find them,
One sync to bring them all and in the darkness bind them
In the Land of Kernel where the buffers lie.

On Jul 17, 2014, at 8:58 PM, Milo Velimirovic <milov at cs.uwlax.edu> wrote:

> Three <mumble> for the Elven-kings under the sky,
> On Jul 17, 2014, at 9:52 PM, Tim Newsham wrote:
>> 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
>> _______________________________________________
>> TUHS mailing list
>> TUHS at minnie.tuhs.org
>> https://minnie.tuhs.org/mailman/listinfo/tuhs

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