[Gluster-users] Using TSM to back-up glusterfs

[Pat Haley]

Hi Anand Babu Periasamy,

Yes, I can read

/gdata/projects/philex/OAG/2011/May16/mdor3km07/coast_den2.in

directly from the backend  disk (specifically: logged onto
machine containing the disk and did a more).

Furthermore I can read (i.e. "more") that file other nodes
in our cluster going through gluster.

Following up on another lead from this list, the TSM software
is not using direct i/o (O_DIRECT).


> On Mon, Jun 27, 2011 at 12:08 PM, Pat Haley <phaley at mit.edu 
> <mailto:phaley at mit.edu>> wrote:
> 
> 
>     Hi
> 
>     We have been trying back-up a glusterfs (v3.1.4) area using
>     the Tivoli TSM software to an off-site area.  The back-up
>     keeps failing with the following typical error messages
> 
>     06/14/2011 22:22:58 ANS1587W  I/O error reading file attributes for:
>     /gdata/projects/philex/OAG/__2011/May16/mdor3km10/coast___den2.in
>     <http://coast_den2.in>. errno = 22, Invalid argument
> 
>     06/14/2011 22:22:59 ANS4007E Error processing
>     '/gdata/projects/philex/OAG/__2011/May16/mdor3km07/coast___den2.in
>     <http://coast_den2.in>': access to the object is denied
> 
>     We originally thought the problem was bad meta-pointer files,
>     but we still experience the failures after deleting all meta-pointer
>     files.
> 
>     Has anyone else experienced/solved this problem?
> 
>     -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=__-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=__-=-=-
>     Pat Haley                          Email:  phaley at mit.edu
>     <mailto:phaley at mit.edu>
>     Center for Ocean Engineering       Phone:  (617) 253-6824
>     <tel:%28617%29%20253-6824>
>     Dept. of Mechanical Engineering    Fax:    (617) 253-8125
>     <tel:%28617%29%20253-8125>
>     MIT, Room 5-222B                   http://web.mit.edu/phaley/www/
>     77 Massachusetts Avenue
>     Cambridge, MA  02139-4301
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> 
> 
> 
> Hi Pat, Let me get some one from the engineering team to coordinate with 
> you. For now, you can check this:
> 
> '/gdata/projects/philex/OAG/__2011/May16/mdor3km07/coast___den2.in 
> <http://coast_den2.in/>
> This file must exist on one of the backend disks. See if you can 
> directly read from the backend disks. If it is not a bad backend disk, 
> then it is a GlusterFS issue.
> 
> If you provide us remote access via reverse-ssh / screen or webex, we 
> can quickly narrow down. We don't have a TSM environment in our labs. 
> You can help us validate compatibility. 
> 
> Also I am not sure if TSM allows scripting. If we can make TSM tools use 
> GlusterFS 3.2 marker APIs, then you can achieve continuous backup 
> functionality (backup data as and when it changes, without crawling the 
> name space). It will significantly improve your backup performance (no 
> more backup windows). Marker APIs can even be invoked via shell 
> scripting using attr tools.
> 
> -- 
> Anand Babu Periasamy
> Blog [http://www.unlocksmith.org <http://www.unlocksmith.org/>]
> 
> Imagination is more important than knowledge --Albert Einstein


-- 

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Pat Haley                          Email:  phaley at mit.edu
Center for Ocean Engineering       Phone:  (617) 253-6824
Dept. of Mechanical Engineering    Fax:    (617) 253-8125
MIT, Room 5-222B                   http://web.mit.edu/phaley/www/
77 Massachusetts Avenue
Cambridge, MA  02139-4301