Re: cannot use btrfs for nfs server

Hugo Mills
2021-07-09T07:24:35Z

I'm using it on NFSv3 and it works fine for me.

Hugo.

On Fri, Jul 09, 2021 at 09:23:14AM +0200, Forza wrote:
> Hello everyone,
>
> ---- From: Ulli Horlacher <framstag@rus.uni-stuttgart.de> -- Sent: 2021-07-09 - 08:53 ----
>
> > On Fri 2021-07-09 (01:05), Graham Cobb wrote:
> >> On 08/07/2021 23:17, Ulli Horlacher wrote:
> >>
> >> >
> >> > I have waited some time and some Ubuntu updates, but the bug is still there:
> >>
> >> Yes: find and du get confused about seeing inode numbers reused in what
> >> they think is a single filesystem.
> >
> > A lot of tools aren't working correctly any more, even ls:
> >
> > root@tsmsrvj:~# ls -R /nfs/localhost/fex | wc
> > ls: /nfs/localhost/fex/spool: not listing already-listed directory
> >
> > In consequence many cronjobs and montoring tools will fail :-(
> >
> >
> >> You can eliminate the problems by exporting and mounting single
> >> subvolumes only
> >
> > This is not possible at our site, we use rotating snapshots created by a
> > cronjob.
> >
> >
>
> Have you tried using the fsid= export option in /etc/exports?
>
> Example:
> /media/nfs/ 192.168.0.*(fsid=20000001,rw,sync,no_subtree_check,no_root_squash)
>
> We're using this with Btrfs subvols without issues. We use NFSv4 so I do not know how this works with NFSv3.
>
> Example:
> ## On the Ubuntu NFS server:
> # btrfs sub list -o .
> ID 5384 gen 345641 top level 258 path volume/nfs_ssd/132bbc3e-aed1-15a5-f30d-9515e490e62c/subvol1
> ID 5385 gen 345640 top level 258 path volume/nfs_ssd/132bbc3e-aed1-15a5-f30d-9515e490e62c/subvol2
>
> ## On the NFS client:
> [09:20 srv01 132bbc3e-aed1-15a5-f30d-9515e490e62c]# ll
> total 0
> drwxr-xr-x 1 root root 6 Jul 9 09:17 subvol1
> drwxr-xr-x 1 root root 0 Jul 9 09:17 subvol2
> [09:20 srv01 132bbc3e-aed1-15a5-f30d-9515e490e62c]# touch subvol1/foo
> [09:20 srv01 132bbc3e-aed1-15a5-f30d-9515e490e62c]# touch subvol2/bar
> [09:20 srv01 132bbc3e-aed1-15a5-f30d-9515e490e62c]# touch foobar
> [09:20 srv01 132bbc3e-aed1-15a5-f30d-9515e490e62c]# ll -R
> .:
> total 0
> -rw-r--r-- 1 root root 0 Jul 9 09:20 foobar
> drwxr-xr-x 1 root root 12 Jul 9 09:20 subvol1
> drwxr-xr-x 1 root root 6 Jul 9 09:20 subvol2
>
> ./subvol1:
> total 0
> -rw-r--r-- 1 root root 0 Jul 9 09:17 bar
> -rw-r--r-- 1 root root 0 Jul 9 09:20 foo
>
> ./subvol2:
> total 0
> -rw-r--r-- 1 root root 0 Jul 9 09:20 bar
>
>
>

--
Hugo Mills | Modern medicine does not treat causes: headaches are
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