[OpenAFS] Re: obsolete volumes

[Kim Kimball]

Derrick J Brashear wrote:
> On Thu, 1 Feb 2007, Kim Kimball wrote:
>
>>
>>
>> Jeffrey Hutzelman wrote:
>>>
>>>
>>> On Wednesday, January 31, 2007 03:44:35 PM -0800 Renata Maria Dart 
>>> <renata@slac.stanford.edu> wrote:
>>>
>>>> Hi Jeff,
>>>>
>>>> Does -showsuid also imply -nowrite, or can it be used with -nowrite
>>>> to avoid taking the server out?
>>>
>>> Yes, -showsuid also implies -nowrite.
>>> In general, you can always use -nowrite to run the salvager in a 
>>> read-only mode where it will only tell you what it would do, rather 
>>> than actually doing anything.  This eliminates any need to shut down 
>>> the fileserver; however, you only get that benefit if you run the 
>>> salvager by hand - the 'bos salvage' command only knows how to 
>>> handle a limited number of salvager arguments.
>>>
>>> Remember that if you run the salvager by hand and do not use one of 
>>> -nowrite, -showmounts, or -showsuid, you must shut down the 
>>> fileserver first.  Otherwise you risk damaging volumes.
>>>
>>
>> Isn't this true iff salvaging one or more partitions?  Salvaging a 
>> single volume doesn't cause 'bos salvage' to shut down the file 
>> server ...
>
> Correct.
>

Oh good.  That's what I taught in the Transarc/IBM AFS Admin class.  
Every once in a while I discover that I've misinformed a small herd of 
admins.  Usually not too egregiously.

I remember asking one of the Transarc developers what would happen if I 
salvaged a partition without shutting down the fileserver process.  As I 
recall the consensus was that the file server and or the volserver might 
try to modify the volume concurrent with the salvage, and that the 
results were 'undefined.'
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