Bug 693703 - Better documentation for acdirmin option (or fix for BZ 678544)
Better documentation for acdirmin option (or fix for BZ 678544)
Product: Fedora
Classification: Fedora
Component: nfs-utils (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Steve Dickson
Fedora Extras Quality Assurance
Depends On:
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Reported: 2011-04-05 07:31 EDT by Stefan Walter
Modified: 2012-08-07 14:39 EDT (History)
3 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2012-08-07 14:39:23 EDT
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Stefan Walter 2011-04-05 07:31:52 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):


How reproducible:

Always on F15 alpha, F14 or EL6.
Always with F15 alpha as server and client.
Comment 1 Fedora End Of Life 2012-08-07 14:39:27 EDT
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