NFS using sync or async?

pugglewuggle

New Member
Jan 20, 2025
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I have my NFS export for my Proxmox storage pool on my storage server set up with the sync option for the export. When I look at the Proxmox host, looking at nfsstat -m and /etc/mtab as well as /proc/mounts, I don't see sync anywhere. Is there a way to verify that sync is being used and not async? I don't want any data corruption due to power loss...
 
Hi @pugglewuggle ,
If neither shows up in your outputs, that means the default is used. For NFS3 - async, or NFS4 - sync


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Thanks so much for the reply. Is this documented anywhere? I have looked all over the place and all there is is conflicting information, even for the same NFS version. Also, is what the client prints actually what is in use or simply what is configured (I'm thinking about wsize/rsize conflicts/etc. between the NFS server export and client)?