[OpenAFS-devel] afs and byte-range locking ideas

[Thomas Vincent]

Does DFS take a huge performance hit due to its support of byte-level 
locking?
Or since DFS was designed from the ground up with byte-level locking in 
mind, it doesn't take a hit. I realize DFS is a totally different beast 
then AFS. It is the only file system with similiar capabilities to AFS 
that supports byte-level locking that I can think of.

Cheers,
Thomas Vincent

On Wednesday, December 5, 2001, at 08:17  AM, Jeffrey Hutzelman wrote:

> Not with the current protocol.  That sort of capability would require
> block-level callbacks and data version tracking, which could quickly get
> messy.  I'm not saying its impossible, but it would require considerable
> additional work, and might turn out to impact performance too much.
>
>> I guess what that implies is that the stage 1 (client side only
>> upgradable locks) are the best that we can do without completely
>> changing the way afs works. That would be an improvement - at least 
>> apps
>> on the same box can have fully functional locking support.
>
> Without a significant protocol change, yes, stage 1 is the best we can 
> do.