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| author | rmacklem <rmacklem@FreeBSD.org> | 2013-05-01 22:50:45 +0000 |
|---|---|---|
| committer | rmacklem <rmacklem@FreeBSD.org> | 2013-05-01 22:50:45 +0000 |
| commit | 949a19d4024bc421eeb78e8b05c9482a2e6ff788 (patch) | |
| tree | ee35dc6df84c537c1f6d8cffb3d2b5a7646c3c7f /usr.sbin/nfsd/nfsv4.4 | |
| parent | c09afe5aa87f38f15ad9b407799cb6e03b07807f (diff) | |
| download | FreeBSD-src-949a19d4024bc421eeb78e8b05c9482a2e6ff788.zip FreeBSD-src-949a19d4024bc421eeb78e8b05c9482a2e6ff788.tar.gz | |
Document the fact that an NFSv4 mount against a volume on the same host
can result in a hung NFS server and is not recommended.
This is a content change.
MFC after: 2 weeks
Diffstat (limited to 'usr.sbin/nfsd/nfsv4.4')
| -rw-r--r-- | usr.sbin/nfsd/nfsv4.4 | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/usr.sbin/nfsd/nfsv4.4 b/usr.sbin/nfsd/nfsv4.4 index 679bb69..e0e6023 100644 --- a/usr.sbin/nfsd/nfsv4.4 +++ b/usr.sbin/nfsd/nfsv4.4 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd December 23, 2012 +.Dd May 1, 2013 .Dt NFSV4 4 .Os .Sh NAME @@ -287,6 +287,13 @@ and daemons at boot time via the ``nfsuserd_flags'' and ``nfscbd_flags'' .Xr rc.conf 5 variables. +.Pp +NFSv4 mount(s) against exported volume(s) on the same host are not recommended, +since this can result in a hung NFS server. +It occurs when an nfsd thread tries to do an NFSv4 VOP_RECLAIM()/Close RPC +as part of acquiring a new vnode. +If all other nfsd threads are blocked waiting for lock(s) held by this nfsd +thread, then there isn't an nfsd thread to service the Close RPC. .Sh FILES .Bl -tag -width /var/db/nfs-stablerestart.bak -compact .It Pa /var/db/nfs-stablerestart |
