[ovirt-users] NFS and pass discards\unmap question

[Sergey Kulikov]

Thanks! I think now It's question to NetApp, when they'll make 4.2 available,
I've tried to manually mount v4.2 on host,
but unfortunately:
# mount -o vers=4.2 10.1.1.111:/test /tmp/123 
mount.nfs: Protocol not supported

so, my NetApp is vers=4.1 max (

-- 



 Friday, February 3, 2017, 15:54:54:





> On Feb 3, 2017 1:50 PM, "Nir Soffer" <nsoffer at redhat.com> wrote:

> On Fri, Feb 3, 2017 at 2:29 PM, Sergey Kulikov <serg_k at msm.ru> wrote:
 >>
 >>
 >> Hm... maybe I need to set any options, is there any way to force ovirt to mount with this extension, or version 4.2
 >> there is only 4.1 selection in "New Domain" menu.
 >> Current mount options:
 >> type nfs4 (rw,relatime,vers=4.1,rsize=65536,wsize=65536,namlen=255,soft,nosharecache,proto=tcp,port=0,timeo=600,retrans=6,sec=sys,local_lock=none)
 >>
 >> it should work only if forced option vers=4.2 ?
 >> I thought it's implemented as feature to older version, not 4.2, there is few info about this.
>  
>  Looks like ovirt engine does not allow nfs version 4.2.




> But custom options can be used. 
> Y. 


>  
>  We have this RFE:
>  https://bugzilla.redhat.com/1406398
>  
>  So practically, both sparsify and pass discard with NFS are useless
>  in the current version.
>  
>  I think this should be fix for next 4.1 build.
>  
>  Nir
>  

 >>
 >>
 >> --
 >>
 >>
 >>
 >>  Friday, February 3, 2017, 14:45:43:
 >>
 >>
 >>
 >>
 >>
 >>> On Thu, Feb 2, 2017 at 11:45 PM, Sergey Kulikov <serg_k at msm.ru> wrote:
 >>
 >>
 >>>  I've upgraded to 4.1 release, it have great feature "Pass
 >>> discards", that now can be used without vdsm hooks,
 >>>  After upgrade I've tested it with NFS 4.1 storage, exported from
 >>> netapp, but unfortunately found out, that
 >>>  it's not working, after some investigation, I've found, that NFS
 >>> implementation(even 4.1) in Centos 7
 >>>  doesn't support sparse files and fallocate(FALLOC_FL_PUNCH_HOLE),
 >>> that quemu uses for file storage, it was
 >>>  added only in kernel 3.18, and sparse files is also announced feature of upcoming NFS4.2,
 >>>  sparsify also not working on this data domains(runs, but nothing happens).
 >>>
 >>>  This test also shows, that FALLOC_FL_PUNCH_HOLE not working, it
 >>> was executed on centos ovirt host with mounted nfs share:
 >>>  # truncate -s 1024 test1
 >>>  # fallocate -p -o 0 -l 1024 test1
 >>>  fallocate: keep size mode (-n option) unsupported
 >>>
 >>>  Is there any plans to backport this feature to node-ng, or centos? or we should wait for RHEL 8?
 >>
 >>
 >>
 >>
 >>> Interesting, I was under the impression it was fixed some time ago,
 >>> for 7.2[1] (kernel-3.10.0-313.el7)
 >>> Perhaps you are not mounted with 4.2?
 >>
 >>
 >>> Y.
 >>> [1] https://bugzilla.redhat.com/show_bug.cgi?id=1079385
 >>>
 >>>  NFS is more and more popular, so discards is VERY useful feature.
 >>>  I'm also planning to test fallocate on latest fedora with 4.x kernel and mounted nfs.
 >>>
 >>>  Thanks for your work!
 >>>
 >>>  --
 >>>
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