 | | | NFS hanging with U4 kernel | NFS hanging with U4 kernel 2005-01-13 - By Tom Sightler
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> We did experience some
> intermittent
> NFS hanging prior to the U3 kernel but we isolated that to a specific bug
> that
> was supposed to be fixed in the U4 kernel. Currently we have not been able
> to
> pinpoint this as a related bug. Thanks for the response though. --ken
While, based on your description, I would probably agree that it is not
related to the isolated hangs that you were seeing in the pre-U4 kernels
I did want to mention the following:
Assuming your talking about the random NFS hang that has been haunting
RHEL3 since the beginning, it is true that a fix for this problem is
included in U4, however, the fix (really more of a workaround) is not
enabled by default. You must configure your module to be loaded with an
extra parameter to actually activate the "fix". I assume you may
already know this, but I thought I would mention it because just this
week I've has to colleagues who experienced this problem with the U4
kernel because they though "U4 included the fix" but didn't realize it
required an extra configuration option to actually activate the fix.
To implement the fix for the NFS hang you must add something like the
following to your modules.conf file:
options nfs nfs3_acl_max_entries=256
Also, earlier the week there was a report of NFS hangs when talking to
Sun NFS servers (I think) and, while the problem description wasn't
exactly the same, he mentioned that setting nfs3_acl_max_entries=0,
which I would guess basically disables ACL support, worked around his
issue. Might be worth trying.
Just some random thoughts.
Later,
Tom
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<PRE>
<FONT COLOR="#000000">We did experience some</FONT>
<FONT COLOR="#000000">intermittent</FONT>
<FONT COLOR="#000000">NFS hanging prior to the U3 kernel but we isolated that
to a specific bug</FONT>
<FONT COLOR="#000000">that</FONT>
<FONT COLOR="#000000">was supposed to be fixed in the U4 kernel. Currently we
have not been able</FONT>
<FONT COLOR="#000000">to</FONT>
<FONT COLOR="#000000">pinpoint this as a related bug. Thanks for the response
though. --ken</FONT>
</PRE>
</BLOCKQUOTE>
<BR>
While, based on your description, I would probably agree that it is not related
to the isolated hangs that you were seeing in the pre-U4 kernels I did want to
mention the following:<BR>
<BR>
Assuming your talking about the random NFS hang that has been haunting RHEL3
since the beginning, it is true that a fix for this problem is included in U4,
however, the fix (really more of a workaround) is not enabled by default.
You must configure your module to be loaded with an extra parameter to actually
activate the "fix". I assume you may already know this, but I
thought I would mention it because just this week I've has to colleagues who
experienced this problem with the U4 kernel because they though "U4
included the fix" but didn't realize it required an extra configuration
option to actually activate the fix.<BR>
<BR>
To implement the fix for the NFS hang you must add something like the following
to your modules.conf file:<BR>
<BR>
options nfs nfs3_acl_max_entries=256<BR>
<BR>
Also, earlier the week there was a report of NFS hangs when talking to Sun NFS
servers (I think) and, while the problem description wasn't exactly the same,
he mentioned that setting nfs3_acl_max_entries=0, which I would guess basically
disables ACL support, worked around his issue. Might be worth trying.<BR>
<BR>
Just some random thoughts.<BR>
<BR>
Later,<BR>
Tom<BR>
<BR>
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