[gpfsug-discuss] Snapshots / Windows previous versions
Barry Evans
bevans at pixitmedia.com
Wed Jul 6 10:47:16 BST 2016
Can you cut/paste your full VFS options for gpfs and shadow copy from
smb.conf?
On 06/07/2016 10:37, Sobey, Richard A wrote:
>
> Quick followup on this. Doing some more samba debugging (i.e.
> increasing log levels!) and come up with the following:
>
> [2016/07/06 10:07:35.602080, 3]
> ../source3/smbd/vfs.c:1322(check_reduced_name)
>
> check_reduced_name:
> admin/ict/serviceoperations/slough_project/Slough_Layout reduced to
> /gpfs/prd/groupspace/ic/admin/ict/serviceoperations/slough_project/Slough_Layout
>
> [2016/07/06 10:07:35.611881, 3] ../source3/smbd/dosmode.c:196(unix_mode)
>
> unix_mode(admin/ict/serviceoperations/slough_project/Slough_Layout)
> returning 0644
>
> [2016/07/06 10:07:35.613374, 0]
> ../source3/modules/vfs_shadow_copy2.c:1211(check_access_snapdir)
>
> * user does not have list permission on snapdir
> /gpfs/prd/groupspace/ic/admin/ict/.snapshots*
>
> [2016/07/06 10:07:35.613416, 0]
> ../source3/modules/vfs_shadow_copy2.c:1380(shadow_copy2_get_shadow_copy_data)
>
> access denied on listing snapdir
> /gpfs/prd/groupspace/ic/admin/ict/.snapshots
>
> [2016/07/06 10:07:35.613434, 0]
> ../source3/modules/vfs_default.c:1145(vfswrap_fsctl)
>
> FSCTL_GET_SHADOW_COPY_DATA: connectpath /gpfs/prd/groupspace/ic,
> failed - NT_STATUS_ACCESS_DENIED.
>
> [2016/07/06 10:07:47.648557, 3]
> ../source3/smbd/service.c:1138(close_cnum)
>
> 155.198.55.14 (ipv4:155.198.55.14:51298) closed connection to
> service IPC$
>
> Any takers? I cannot run mmgetacl on the .snapshots folder at all, as
> root. A snapshot I just created to make sure I had full control on the
> folder: (39367 is me, I didn’t run this command on a CTDB node so the
> UID mapping isn’t working).
>
> [root at icgpfs01 .snapshots]# mmgetacl -k nfs4 @GMT-2016.07.06-08.00.06
>
> #NFSv4 ACL
>
> #owner:root
>
> #group:root
>
> group:74036:r-x-:allow:FileInherit:DirInherit:Inherited
>
> (X)READ/LIST (-)WRITE/CREATE (-)MKDIR (X)SYNCHRONIZE (X)READ_ACL
> (X)READ_ATTR (X)READ_NAMED
>
> (-)DELETE (-)DELETE_CHILD (-)CHOWN (X)EXEC/SEARCH (-)WRITE_ACL
> (-)WRITE_ATTR (-)WRITE_NAMED
>
> user:39367:rwxc:allow:FileInherit:DirInherit:Inherited
>
> (X)READ/LIST (X)WRITE/CREATE (X)MKDIR (X)SYNCHRONIZE (X)READ_ACL
> (X)READ_ATTR (X)READ_NAMED
>
> (X)DELETE (X)DELETE_CHILD (X)CHOWN (X)EXEC/SEARCH (X)WRITE_ACL
> (X)WRITE_ATTR (X)WRITE_NAMED
>
> *From:*gpfsug-discuss-bounces at spectrumscale.org
> [mailto:gpfsug-discuss-bounces at spectrumscale.org] *On Behalf Of
> *Sobey, Richard A
> *Sent:* 20 June 2016 16:03
> *To:* gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
> *Subject:* Re: [gpfsug-discuss] Snapshots / Windows previous versions
>
> Thanks Kevin. We are upgrading to GPFS 4.2 and CES in a few weeks but
> our customers have come to like previous versions and indeed it is
> sort of a selling point for us.
>
> Samba is the only thing we’ve changed recently after the badlock
> debacle so I’m tempted to blame that, but who knows.
>
> If (when) I find out I’ll let everyone know.
>
> Richard
>
> *From:*gpfsug-discuss-bounces at spectrumscale.org
> [mailto:gpfsug-discuss-bounces at spectrumscale.org] *On Behalf Of
> *Buterbaugh, Kevin L
> *Sent:* 20 June 2016 15:56
> *To:* gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
> *Subject:* Re: [gpfsug-discuss] Snapshots / Windows previous versions
>
> Hi Richard,
>
> I can’t answer your question but I can tell you that we have
> experienced either the exact same thing you are or something very
> similar. It occurred for us after upgrading from GPFS 3.5 to 4.1.0.8
> and it persists even after upgraded to GPFS 4.2.0.3 and the very
> latest sernet-samba.
>
> And to be clear, when we upgraded from GPFS 3.5 to 4.1 we did *not*
> upgrade SAMBA versions at that time. Therefore, I believe that
> something changed in GPFS. That doesn’t mean it’s GPFS’ fault, of
> course. SAMBA may have been relying on a
> bug<ctrl-h><ctrl-h><ctrl-h>undocumented feature in GPFS that IBM fixed
> for all I know, and I’m obviously speculating here.
>
> The problem we see is that the .snapshots directory in each folder can
> be cd’d to but is empty. The snapshots are all there, however, if you:
>
> cd /<mount point of fs>/.snapshots/<data and time snapshot was
> taken>/rest/of/path/to/folder/in/question
>
> This obviously prevents users from being able to do their own recovery
> of files unless you do something like what you describe, which we are
> unwilling to do for security reasons. We have a ticket open with DDN…
>
> Kevin
>
> On Jun 20, 2016, at 8:45 AM, Sobey, Richard A
> <r.sobey at imperial.ac.uk <mailto:r.sobey at imperial.ac.uk>> wrote:
>
> Hi all
>
> Can someone clarify if the ability for Windows to view snapshots
> as Previous Versions is exposed by SAMBA or GPFS? Basically, if
> suddenly my users cannot restore files from snapshots over a CIFS
> share, where should I be looking?
>
> I don’t know when this problem occurred, but within the last few
> weeks certainly our users with full control over their data now
> see no previous versions available, but if we export their fileset
> and set “force user = root” all the snapshots are available.
>
> I think the answer is SAMBA, right? We’re running GPFS 3.5 and
> sernet-samba 4.2.9.
>
> Many thanks
>
> Richard
>
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>
> —
>
> Kevin Buterbaugh - Senior System Administrator
>
> Vanderbilt University - Advanced Computing Center for Research and
> Education
>
> Kevin.Buterbaugh at vanderbilt.edu
> <mailto:Kevin.Buterbaugh at vanderbilt.edu> - (615)875-9633
>
>
>
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--
Barry Evans
Technical Director & Co-Founder
Pixit Media
Mobile: +44 (0)7950 666 248
http://www.pixitmedia.com
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