[ClusterLabs] NFS mount fails to stop if NFS server is lost

Tue Apr 11 14:47:01 EDT 2023

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<html><body><div dir=3D"auto">What about umount -f -l ?</div><div dir=3D"au=
to"><br></div><div id=3D"ms-outlook-mobile-signature" dir=3D"auto"><div id=
=3D"mail-editor-reference-message-container" dir=3D"auto"><hr style=3D"disp=
lay:inline-block;width:98%" tabindex=3D"-1"><div id=3D"divRplyFwdMsg" style=
=3D"font-size: 11pt;"><strong>From:</strong> Users <users-bounces at cluste=
rlabs.org> on behalf of Andrei Borzenkov <arvidjaar at gmail.com><br>=
<strong>Sent:</strong> Tuesday, April 11, 2023, 20:26<br><strong>To:</stron=
g> users at clusterlabs.org <users at clusterlabs.org><br><strong>Subject:<=
/strong> Re: [ClusterLabs] NFS mount fails to stop if NFS server is lost<br=
></div><br>On 11.04.2023 17:35, Miro Igov wrote:<br>> Hello,<br>> <br=
>> I have a node nas-sync-test1 with NFS server and NFS export running a=
nd<br>> another node intranet-test1 with data_1 fs mount:<br>> <br>&g=
t;   <br>> <br>> primitive data_1 Filesystem \<br>> <br>>      =
    params device=3D"nas-sync-test1:/home/pharmya/NAS" fstype=3Dnfs<br>>=
 options=3Dv4 directory=3D"/data/synology/pharmya_office/NAS_Sync/NAS" \<br=
>> <br>>          op monitor interval=3D10s<br>> <br>>   <br>&g=
t; <br>> Disconnecting nas-sync-test1 from the network shows it's state =
as UNCLEAN<br>> and pacemaker fences it.<br>> <br>> Then it tries =
to stop data_1 but it shows timeout error.<br>> <br>>   <br>> <br>=
> I know unmounting of NFS mount  when NFS server is gone requires force=
 Is<br>> there such option in Filesystem RA ?<br>> <br><br>It does it=
 unconditionally from the very beginning<br><br>                 # For netw=
orked filesystems, there's merit in trying -f:<br>                 case "$F=
STYPE" in<br>                 nfs4|nfs|efs|cifs|smbfs) umount_force=3D"-f" =
;;<br>                 esac<br><br>But IIRC it is not enough (at least, not=
 always) - so the trick is to <br>setup the same IP address as server had. =
It could be an alias on a local <br>client interface, does not matter. I su=
ppose client gets stuck somewhere <br>below application layer and having IP=
 resets TCP connection allowing it <br>to proceed.<br><br>I certainly had t=
o do it in the past, and simple "umount -f" did not work.<br>______________=
_________________________________<br>Manage your subscription:<br>https://l=
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