[daip] AIPS on lustre

[Kit Westneat]

I am no expert on flock, but basically it seems like it tries to prevent 
two processes from opening the same file at the same time. The 
ramifications of having only a localflock is that different Lustre 
clients won't be able to tell if a client on another machine has locked 
the file. As long as you do all of your work on one machine, say batman, 
then the file locking will work like normal. But if you do some stuff on 
Big Red too, the Big Red processes won't be able to tell if the file is 
open on batman, and vice-versa.

If you take care though, there shouldn't be any problems from using a 
local flock.

HTH,
Kit

Scott Michael wrote:
> We've managed to get aips working on a lustre mount, however we had to 
> use local file locking by mounting with -o localflock. This may cause 
> issues for us, the dc team can elaborate. We were wondering what the 
> purpose of the file locking is and if there is some way around it. As 
> some added info I'm including strace ouputs for aips when the data 
> directory is on local disk and when it is on the lustre fs (dc.out) 
> without local file locking.
>
> Scott
>
> Wes Young wrote:
>> Ah, yeah.  We've not tested AIPS on lustre and your's is the second 
>> report.  Chances are we will not be able to do anything on this until 
>> after March 1.
>>
>> wes
>> wyoung at aoc.nrao.edu
>>
>>
>> On Feb 22, 2008, at 10:07 AM, Scott Michael wrote:
>>
>>> Hi,
>>>
>>> I am trying install AIPS on  a lustre system. When I put the data 
>>> disk on a local drive everything is peachy. However, when I have the 
>>> data disk on a lustre disk I get multiple ZLOCK errors. How can I 
>>> resolve this?
>>>
>>> Scott Michael
>>> IU Astronomy
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