Bug 481579

Summary: fsc is no longer available for nfs mount points after upgrading from nfs-utils-1.0.9-35z.el5_2 to nfs-utils-1.0.9-40.el5.
Product: Red Hat Enterprise Linux 5 Reporter: Mark London <mrl>
Component: nfs-utilsAssignee: Steve Dickson <steved>
Status: CLOSED NOTABUG QA Contact: Martin Jenner <mjenner>
Severity: high Docs Contact:
Priority: low    
Version: 5.3CC: matthias
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2009-02-13 18:43:10 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Mark London 2009-01-26 15:18:14 UTC
Description of problem:

The nfs option fsc is no longer available for nfsv3 mount points after upgrading from nfs-utils-1.0.9-35z.el5_2 to nfs-utils-1.0.9-40.el5.  This only becomes apparent after a reboot of the system, when the mount points no longer will mount.  I can't find any documentation on the web for this new path (nfs-utils-1.0.9-40.el5).  Thanks. - Mark 

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Comment 1 Mark London 2009-01-26 18:35:53 UTC
Correction, the fsc option is no longer available for nfs for any version,  not just v3.  We just tried it for v4 and the mount command also does not recognize it:

[root@cmodws09 ~]# mkdir /foo
[root@cmodws09 ~]# mount -o fsc -t nfs4 test:/ /foo
unknown nfs mount option: fsc
[root@cmodws09 ~]# mount -o fsc test:/ /foo
Unsupported nfs mount option: fsc

Comment 2 Mark London 2009-02-13 14:47:34 UTC
Can I get someone to respond to this reported problem?  Thanks! - Mark

Comment 3 Steve Dickson 2009-02-13 18:43:10 UTC
Sorry for the delay.... 

FS-Cache was technology preview, which meant we were not going
to guarantee any support and had the right to disable it at anytime.

Since the technology never was accepted into the Linux mainline
kernel (what we refer to as upstream), it was decided to disable
the technology in the RHEL 5.3 release. That's the bad news...

The good news is there is a very good chance FS-Cache technology
will be accepted in mainline kernel very soon. Which means there
is a good chance the technology will reappear in RHEL 6

The latest code release can be found on the 'linux-mm' branch
upstream NFS maintainter's git tree which can be found at:
    git://git.linux-nfs.org/pub/linux/nfs-2.6.git

Comment 4 Mark London 2009-02-13 20:57:20 UTC
Thanks for the info! - Mark

Comment 5 Matthias Saou 2009-03-20 16:26:33 UTC
Just for the sake of completeness : It's not the userspace tools which no longer permit using the option, it's apparently the RHEL 5.3 kernel (2.6.18-128.el5+) which no longer supports the feature. Too bad, really.