[Linux-cluster] GFS

[Mohamed Magdi Abbas]

David Teigland wrote:
> On Tue, Oct 26, 2004 at 04:41:29PM -0400, Dascalu Dragos wrote:
> 
>>We are working on a similar scenario but adding mailman into the mix. 
>>The ideal outcome would be for multiple mailman/postfix servers to 
>>write archives, etc to the same centralized location on a SAN. After 
>>doing some tests this setup does not appear to be trivial. We ran into 
>>a similar problem when using NFS; if multiple machines write to the 
>>same file at the same time the file gets mangled as the machines cut 
>>each other off. With GFS we noticed that each machine has a 4k buffer 
>>window in which it writes its data. If a second process decides to 
>>start writing to the same file we noticed alternating writes to the 
>>file after 4k of data.
> 
> 
> Note that this sounds like perfectly correct behavior on the part of gfs.
> The application is responsible for the necessary file locking, of course,
> while gfs is responsible for keeping the fs uncorrupted.
> 

I thought the idea of GFS is that it would handle locking to enable 
shared filesystems among different nodes with simultaneous r/w access to 
the filesystem.

Mohamed
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