[Bugs] [Bug 1152265] New: Documentation Update to Warn about localhost NFS mounts

bugzilla at redhat.com bugzilla at redhat.com
Mon Oct 13 18:10:53 UTC 2014


https://bugzilla.redhat.com/show_bug.cgi?id=1152265

            Bug ID: 1152265
           Summary: Documentation Update to Warn about localhost NFS
                    mounts
           Product: GlusterFS
           Version: 3.5.2
         Component: nfs
          Severity: high
          Assignee: gluster-bugs at redhat.com
          Reporter: chuck at itadmins.net
                CC: bugs at gluster.org



Description of problem: As many know, and more importantly many do not know,
localhost (loopback) NFS mounts can lead to deadlocks under heavy load. There
should be a warning in the documentation regarding this bug. Although it is NOT
a GFS bug it can and will cause problems for those without the knowledge that I
learned the hard way today on a production server.


Version-Release number of selected component (if applicable): I would imagine
this applies to all versions until the kernel is patched.


How reproducible: mount a localhost with nfs and rsync ca. 10+ GB files (not
sure what the lower limit is and I tried ca 11 GB when it deadlocked)


Steps to Reproduce:
1. mount local volume per nfs
2. copy files
3. wait for deadlock and recover the server while hoping for no major damage

Actual results: deadlock


Expected results: no deadlock


Additional info: I was thinking the warning could be added here:
https://github.com/gluster/glusterfs/blob/master/doc/admin-guide/en-US/markdown/admin_settingup_clients.md#nfs

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