Simon Wilkinson wrote (Mon Jul 13 2009 23:39:06 GMT+0200 (CEST))
On 13 Jul 2009, at 22:26, Alf Wachsmann wrote:
I would like to open the discussion about these changes since they
will have to be dealt with for the RXOSD changes anyway but provide
by themselves already a very useful feature.
Rather than overloading existing fields (especially in the case of
returning two values bitpacked into MinQuota), I think it's more
valuable to consider the RPC changes necessary to support this as a
first class feature. Fortunately, this would appear to be relatively
simple. We would need to to revise GetVolumeStatus and SetVolumeStatus,
and the structures AFSFetchVolumeStatus, and AFSStoreVolumeStatus.
I will leave others to speak to the desirability of using the MinQuota
portion of the volume header - I've got no idea how widespread other
uses for this field may be.
Oh it's useful alright - many HEP sites supposedly use AFS as grid and
farm computing storage, and thrashing due to misbehaving parallel jobs
(that create huge numbers of files in single volumes) is a probably
common issue.
Bear in mind that not only are additional RPCs needed, but the volume
dump format must be extended as well. I expect such an extension to be
on the agenda for the upcoming protocol upgrade?
Cheers
- Felix
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