Red Hat Bugzilla – Bug 693703
Better documentation for acdirmin option (or fix for BZ 678544)
Last modified: 2012-08-07 14:39:27 EDT
Description of problem:
The conclusion of BZ 678544 was that if one has read and write accesses
over NFS3 from multiple clients on the same files and wants to avoid random
stale NFS handles, one only has the following options:
1. mount -o sync
2. mount -o lookupcache=none
3. mount -o acdirmin=2
These options qualify as workarounds in my opinion. 1 and 2 have horrible
performance and 3 is absolutely not obvious to any sysadmin who has not
read and understood the NFS client kernel source code.
The best in my opinion would be to revisit that part of the client code and
reconsider the optimization. Making acdirmin=2 the default could also qualify
as a solution. If that is not possible I request that the documentation of
mount.nfs(8) or nfs(5) is updated to reflect the choice an administrator
has to make when mounting an NFS share.
Version-Release number of selected component (if applicable):
Always on F15 alpha, F14 or EL6.
Always with F15 alpha as server and client.
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