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Jeroen Jacobs
Asked: 2012-09-04 04:56:02 +0800 CST

XenServer and ZFS via NFS

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I'm trying to connect a NFS share to XenCenter. The NFS server is a ZFSGuru distro (uses FreeBSD).

The zfs volume was exported like this:

/sbin/zfs set sharenfs="on" temppool/share

According to "showmount", it's available:

showmount -e
/temppool/share   Everyone

However, when I try to connect to it with XenServer (so it can be used as storage for VHD), I get the following error:

Internal error:Failure("Storage_access failed with: SR_BACKEND_FAILURE_73: [; NFS mount error[opterr=mount failed with return code 32]; ]")

Anyone got an idea?

Update:

This is from the log on the NFS server:

Sep 3 16:23:10 zfsguru mountd[962]: mount request from 192.168.10.217 for non existent path /temppool/share/7c8d3f2f-e0e0-5263-ccad-1cd32a4139cf

Sep 3 16:23:10 zfsguru mountd[962]: mount request denied from 192.168.10.217 for /temppool/share/7c8d3f2f-e0e0-5263-ccad-1cd32a4139cf

Sep 3 16:23:11 zfsguru mountd[962]: mount request from 192.168.10.217 for non existent path /temppool/share/7c8d3f2f-e0e0-5263-ccad-1cd32a4139cf

Sep 3 16:23:11 zfsguru mountd[962]: mount request denied from 192.168.10.217 for /temppool/share/7c8d3f2f-e0e0-5263-ccad-1cd32a4139cf

Sep 3 16:28:20 zfsguru mountd[962]: mount request denied from 192.168.10.217 for /temppool/share/17922178-0dfb-edf3-0037-2eddd79b9d02

Sep 3 16:28:43 zfsguru last message repeated 5 times

Sep 3 16:35:00 zfsguru mountd[962]: mount request denied from 192.168.10.217 for /temppool/share/b5735ccf-1997-8d77-83a0-2f34e37dda8d

Sep 3 16:35:33 zfsguru last message repeated 4 times

Sep 3 16:35:34 zfsguru mountd[962]: mount request denied from 192.168.10.217 for /temppool/share/b5735ccf-1997-8d77-83a0-2f34e37dda8d

It seems XenServer is able to create the directories, but is enable to mount them afterwards.

freebsd

4 Answers

  1. XenServer tries to directly mount the subfolders under your share (e.g. /temppool/share/7c8d3f2f-e0e0-5263-ccad-1cd32a4139cf). These folders have to be exported via your NFS-Server.

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  2. try to mount it manually via XenServer CLI. Also check permissions (full read/write access is required).

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  3. Try to use nfsd with exports Try out following solution link http://myitnotes.info/doku.php?id=en:jobs:freebsd_zfs_nfs_for_vmware

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  4. It appears to be trying to mount to folders below your NFS export so you may need to add the alldirs option to the exports.

    zfs set sharenfs="-alldirs -maproot=root" dataset

    This doesn't explain why it's trying to mount non-existent folders though so this may not be a full solution.

    Edited to add maproot as apparently just alldirs made no difference. Without mapping root to local root (or another local user) the client might not have permission to create entries on the NFS server.

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