On Thu, Jul 17, 2014 at 01:02:06PM +0000, philippe.simo...@swisscom.com wrote: > Hi Hugo > > > -----Original Message----- > > From: Hugo Mills [mailto:h...@carfax.org.uk] > > Sent: Thursday, July 17, 2014 1:13 PM > > To: Simonet Philippe, INI-ON-FIT-NW-IPE > > Cc: linux-btrfs@vger.kernel.org > > Subject: Re: NFS FILE ID not unique when exporting many brtfs subvolumes > > > > On Thu, Jul 17, 2014 at 10:40:14AM +0000, philippe.simo...@swisscom.com > > wrote: > > > I have a problem using btrfs/nfs to store my vmware images. > > [snip] > > > - vmware is basing its NFS files locks on the nfs fileid field returned > > > from a NFS > > GETATTR request for the file being locked > > > > > http://kb.vmware.com/selfservice/microsites/search.do?language=en_ > > US&cmd=displayKC&externalId=1007909 > > > vmware assumes that these nfs fileid are unique per storage. > > > > > > - it seemed that these nfs fileid are only unique 'per-subvolume', but > > > because > > my nfs export contains many subvolumes, > > > the nfs export has then my files (in different subvolume) with the same > > > nfs > > fileid. > > > > > > - no problem when I start all machine alone, but when 2 machines are > > > running > > at the same time, vmware seems to mix its reference to lock file and > > > sometimes kills one vm. > > > > > > in esx server, following messages : /var/log/vmkwarning.log : > > > > > > 2014-07-17T06:31:46.854Z cpu2:268913)WARNING: NFSLock: 1315: > > Inode (Dup: 260 Orig: 260) has been recycled by server, freeing lock info > > for > > .lck-0401000000000000 > > > 2014-07-17T06:34:47.925Z cpu2:114740)WARNING: NFSLock: 2348: > > Unable to remove lockfile .invalid, not found > > > 2014-07-17T10:18:50.320Z cpu0:32824)WARNING: NFSLock: 2348: > > Unable to remove lockfile .invalid, not found > > > > > > and in machine log : > > > Message from sncubeesx02: The lock protecting vm-w7- > > sysp.vmdk has been lost, > > > possibly due to underlying storage issues. If this virtual > > > machine > > is configured to be highly > > > available, ensure that the virtual machine is running on some > > other host before clicking OK. > > > > > > - vmware try to make its own file locking for flowing file type : > > > > > http://kb.vmware.com/selfservice/microsites/search.do?language=en_ > > US&cmd=displayKC&externalId=10051 > > > > > > VMNAME.vswp > > > DISKNAME-flat.vmdk > > > DISKNAME-ITERATION-delta.vmdk > > > VMNAME.vmx > > > VMNAME.vmxf > > > vmware.log > > > > > > Is there a way to deal with this problem ? is that a bug ? > > > > Add an arbitrary and unique "fsid=0x12345" value to the exports > > declaration. For example, my server exports a number of subvolumes > > from the same FS with: > > > > /srv/nfs/nadja -rw,async,fsid=0x1729,no_subtree_check,no_root_squash \ > > 10.0.0.20 fe80::20 > > /srv/nfs/home -rw,async,fsid=0x1730,no_subtree_check,no_root_squash \ > > fe80::/64 > > /srv/nfs/video -ro,async,fsid=0x1731,no_subtree_check \ > > 10.0.0.0/24 fe80::/64 > > > > Hugo. > >
> first of all, thank for your answer ! > on my system, I have one export, that is the root btrfs subvolume > and contains itself one subvolume per vm. > if I change the NFS export fsid, it does not change anything in each > the file IDs of the whole NFS export. > (I crossed checked it just to be sure, tshark -V -nlp -t a port 2049 > | egrep "Entry: name|File ID", and effectively, > fsid has no impact on file id) Aaah, that's interesting. I suspect that you'll have to make the mounts explicit, so for every subvolume exported from the server, there's a line in fstab to mount it to the place it's exported from. This happens as a side-effect of the recommended filesystem/subvol layout[1] anyway, since it doesn't use nested subvolumes at all, so I've never actually noticed the situation you mention. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- "There's a Martian war machine outside -- they want to talk --- to you about a cure for the common cold."
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