Bug 175215

Summary: NFS: inherit-able fsid attribute for configuring exports
Product: [Retired] Red Hat Cluster Suite Reporter: Lon Hohberger <lhh>
Component: rgmanagerAssignee: Lon Hohberger <lhh>
Status: CLOSED ERRATA QA Contact: Cluster QE <mspqa-list>
Severity: medium Docs Contact:
Priority: medium    
Version: 4CC: cluster-maint
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: RHBA-2006-0173 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-01-06 20:25:26 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 132823    
Attachments:
Description Flags
Implements fsid inheritance for fs/nfsexport/nfsclient/clusterfs none

Description Lon Hohberger 2005-12-07 20:06:11 UTC 
Description of problem:

Currently, even with device-mapper, there's a good chance that a device will
have a different major/minor number on two different hosts.  This causes
problems with NFS exports because they use the device number to validate file
handles on reboots.

Rgmanager simultates reboots on failover, but unfortauntely, since the device
might change between nodes, all of the filehandles will become invalid (stale).

Fortunately, nfsd provides an export option, "fsid=x", were X is a symbolic file
system ID which should be used instead of the device major/minor numbers in the
file handle.  On a failover, if the fsid matches, the client file handles are
considered good irrespective of whether or not the actual device numbers match.

Making this an inherit-able piece allows users to specify file system IDs as a
property of the mount - rather than the individual client exports.  This is what
most people would want.  Without this, nfsclient resources can not be reused;
the user must create new ones for each service...
Comment 1 Lon Hohberger 2005-12-07 20:06:11 UTC 
Created attachment 121998 [details]
Implements fsid inheritance for fs/nfsexport/nfsclient/clusterfs
Comment 2 Lon Hohberger 2005-12-07 20:06:49 UTC 
Patches not in CVS yet.
Comment 3 Lon Hohberger 2005-12-07 20:11:35 UTC 
Patch in CVS - head, STABLE, RHEL4
Comment 4 Red Hat Bugzilla 2006-01-06 20:25:26 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2006-0173.html