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

[Sergey Kulikov]

Unfortunately I can't browse this bug:
"You are not authorized to access bug #1079385."
Can you email me details on ths bug?
I think that's the reason I can't find this fix for rhel\centos in google)


-- 



 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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