[gpfsug-discuss] Snapshots / Windows previous versions

[Sobey, Richard A]

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
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