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NFS synchronous or asynchronous?

Discussion in 'Proxmox VE: Installation and configuration' started by mcparlandj, Apr 20, 2017.

  1. mcparlandj

    mcparlandj New Member
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    Does anyone know if the default NFS for Proxmox using an NFS server is synchronous or asynchronous?
     
  2. mir

    mir Well-Known Member
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    man nfs:
    Since default does not set ac or noac the mount is asynchronous.
     
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  3. mcparlandj

    mcparlandj New Member
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    That's great news! Vmware sets to synchronous, and using ZFS backed NFS, even with a fast ZIL performance is awful. I did some testing with Proxmox and performance was amazing and I was thinking maybe I was looking at the numbers wrong :)
     
  4. czechsys

    czechsys Member

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    Well, setting async for VM storage isn't good way...
     
  5. dswartz

    dswartz Member
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    That depends. In general I agree, but one might have no real choice. Depending on the setup, it might be perfectly safe...
     
  6. mcparlandj

    mcparlandj New Member
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    As far as i know iscsi does asynchronous writes as well. So that makes me think doing asynchronous with NFS is just as sketchy as using vanilla iscsi.
     

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