[gpfsug-discuss] What is an independent fileset? was: mmbackup with fileset : scope errors

Jez Tucker jtucker at pixitmedia.com
Thu May 18 20:32:54 BST 2017


Hi

   When mmbackup has passed the preflight stage (pretty quickly) you'll 
find the autogenerated ruleset as /var/mmfs/mmbackup/.mmbackupRules*

Best,

Jez


On 18/05/17 20:02, Jaime Pinto wrote:
> Ok Mark
>
> I'll follow your option 2) suggestion, and capture what mmbackup is 
> using as a rule first, then modify it.
>
> I imagine by 'capture' you are referring to the -L n level I use?
>
> -L n
>          Controls the level of information displayed by the
>          mmbackup command. Larger values indicate the
>          display of more detailed information. n should be one of
>          the following values:
>
>          3
>                   Displays the same information as 2, plus each
>                   candidate file and the applicable rule.
>
>          4
>                   Displays the same information as 3, plus each
>                   explicitly EXCLUDEed or LISTed
>                   file, and the applicable rule.
>
>          5
>                   Displays the same information as 4, plus the
>                   attributes of candidate and EXCLUDEed or
>                   LISTed files.
>
>          6
>                   Displays the same information as 5, plus
>                   non-candidate files and their attributes.
>
> Thanks
> Jaime
>
>
>
>
> Quoting "Marc A Kaplan" <makaplan at us.ibm.com>:
>
>> 1. As I surmised, and I now have verification from Mr. mmbackup, 
>> mmbackup
>> wants to support incremental backups (using what it calls its shadow
>> database) and keep both your sanity and its sanity -- so mmbackup limits
>> you to either full filesystem or full inode-space (independent fileset.)
>> If you want to do something else, okay, but you have to be careful 
>> and be
>> sure of yourself. IBM will not be able to jump in and help you if and 
>> when
>> it comes time to restore and you discover that your backup(s) were not
>> complete.
>>
>> 2. If you decide you're a big boy (or woman or XXX) and want to do some
>> hacking ...  Fine... But even then, I suggest you do the smallest hack
>> that will mostly achieve your goal...
>> DO NOT think you can create a custom policy rules list for mmbackup 
>> out of
>> thin air....  Capture the rules mmbackup creates and make small 
>> changes to
>> that --
>> And as with any disaster recovery plan.....   Plan your Test and Test 
>> your
>> Plan....  Then do some dry run recoveries before you really "need" to 
>> do a
>> real recovery.
>>
>> I only even sugest this because Jaime says he has a huge filesystem with
>> several dependent filesets and he really, really wants to do a partial
>> backup, without first copying or re-organizing the filesets.
>>
>> HMMM.... otoh... if you have one or more dependent filesets that are
>> smallish, and/or you don't need the backups -- create independent
>> filesets, copy/move/delete the data, rename, voila.
>>
>>
>>
>> From:   "Jaime Pinto" <pinto at scinet.utoronto.ca>
>> To:     "Marc A Kaplan" <makaplan at us.ibm.com>
>> Cc:     "gpfsug main discussion list" <gpfsug-discuss at spectrumscale.org>
>> Date:   05/18/2017 12:36 PM
>> Subject:        Re: [gpfsug-discuss] What is an independent fileset? 
>> was:
>> mmbackup        with fileset : scope errors
>>
>>
>>
>> Marc
>>
>> The -P option may be a very good workaround, but I still have to test 
>> it.
>>
>> I'm currently trying to craft the mm rule, as minimalist as possible,
>> however I'm not sure about what attributes mmbackup expects to see.
>>
>> Below is my first attempt. It would be nice to get comments from
>> somebody familiar with the inner works of mmbackup.
>>
>> Thanks
>> Jaime
>>
>>
>> /* A macro to abbreviate VARCHAR */
>> define([vc],[VARCHAR($1)])
>>
>> /* Define three external lists */
>> RULE EXTERNAL LIST 'allfiles' EXEC
>> '/scratch/r/root/mmpolicyRules/mmpolicyExec-list'
>>
>> /* Generate a list of all files, directories, plus all other file
>> system objects,
>>     like symlinks, named pipes, etc. Include the owner's id with each
>> object and
>>     sort them by the owner's id */
>>
>> RULE 'r1' LIST 'allfiles'
>>          DIRECTORIES_PLUS
>>          SHOW('-u' vc(USER_ID) || ' -a' || vc(ACCESS_TIME) || ' -m' ||
>> vc(MODIFICATION_TIME) || ' -s ' || vc(FILE_SIZE))
>>          FROM POOL 'system'
>>          FOR FILESET('sysadmin3')
>>
>> /* Files in special filesets, such as those excluded, are never 
>> traversed
>> */
>> RULE 'ExcSpecialFile' EXCLUDE
>>          FOR FILESET('scratch3','project3')
>>
>>
>>
>>
>>
>> Quoting "Marc A Kaplan" <makaplan at us.ibm.com>:
>>
>>> Jaime,
>>>
>>>   While we're waiting for the mmbackup expert to weigh in, notice that
>> the
>>> mmbackup command does have a -P option that allows you to provide a
>>> customized policy rules file.
>>>
>>> So... a fairly safe hack is to do a trial mmbackup run, capture the
>>> automatically generated policy file, and then augment it with FOR
>>> FILESET('fileset-I-want-to-backup') clauses.... Then run the mmbackup
>> for
>>> real with your customized policy file.
>>>
>>> mmbackup uses mmapplypolicy which by itself is happy to limit its
>>> directory scan to a particular fileset by using
>>>
>>> mmapplypolicy /path-to-any-directory-within-a-gpfs-filesystem --scope
>>> fileset ....
>>>
>>> However, mmbackup probably has other worries and for simpliciity and
>>> helping make sure you get complete, sensible backups, apparently has
>>> imposed some restrictions to preserve sanity (yours and our support
>> team!
>>> ;-) )  ...   (For example, suppose you were doing incremental backups,
>>> starting at different paths each time? -- happy to do so, but when
>>> disaster strikes and you want to restore -- you'll end up confused
>> and/or
>>> unhappy!)
>>>
>>> "converting from one fileset to another" --- sorry there is no such
>> thing.
>>>  Filesets are kinda like little filesystems within filesystems.  Moving
>> a
>>> file from one fileset to another requires a copy operation.   There is
>> no
>>> fast move nor hardlinking.
>>>
>>> --marc
>>>
>>>
>>>
>>> From:   "Jaime Pinto" <pinto at scinet.utoronto.ca>
>>> To:     "gpfsug main discussion list"
>> <gpfsug-discuss at spectrumscale.org>,
>>> "Marc   A Kaplan" <makaplan at us.ibm.com>
>>> Date:   05/18/2017 09:58 AM
>>> Subject:        Re: [gpfsug-discuss] What is an independent fileset?
>> was:
>>> mmbackup        with fileset : scope errors
>>>
>>>
>>>
>>> Thanks for the explanation Mark and Luis,
>>>
>>> It begs the question: why filesets are created as dependent by
>>> default, if the adverse repercussions can be so great afterward? Even
>>> in my case, where I manage GPFS and TSM deployments (and I have been
>>> around for a while), didn't realize at all that not adding and extra
>>> option at fileset creation time would cause me huge trouble with
>>> scaling later on as I try to use mmbackup.
>>>
>>> When you have different groups to manage file systems and backups that
>>> don't read each-other's manuals ahead of time then we have a really
>>> bad recipe.
>>>
>>> I'm looking forward to your explanation as to why mmbackup cares one
>>> way or another.
>>>
>>> I'm also hoping for a hint as to how to configure backup exclusion
>>> rules on the TSM side to exclude fileset traversing on the GPFS side.
>>> Is mmbackup smart enough (actually smarter than TSM client itself) to
>>> read the exclusion rules on the TSM configuration and apply them
>>> before traversing?
>>>
>>> Thanks
>>> Jaime
>>>
>>> Quoting "Marc A Kaplan" <makaplan at us.ibm.com>:
>>>
>>>> When I see "independent fileset" (in Spectrum/GPFS/Scale)  I always
>>> think
>>>> and try to read that as "inode space".
>>>>
>>>> An "independent fileset" has all the attributes of an 
>>>> (older-fashioned)
>>>> dependent fileset PLUS all of its files are represented by inodes that
>>> are
>>>> in a separable range of inode numbers - this allows GPFS to 
>>>> efficiently
>>> do
>>>> snapshots of just that inode-space (uh... independent fileset)...
>>>>
>>>> And... of course the files of dependent filesets must also be
>>> represented
>>>> by inodes -- those inode numbers are within the inode-space of 
>>>> whatever
>>>> the containing independent fileset is... as was chosen when you 
>>>> created
>>>> the fileset....   If you didn't say otherwise, inodes come from the
>>>> default "root" fileset....
>>>>
>>>> Clear as your bath-water, no?
>>>>
>>>> So why does mmbackup care one way or another ???   Stay tuned....
>>>>
>>>> BTW - if you look at the bits of the inode numbers carefully --- you
>> may
>>>> not immediately discern what I mean by a "separable range of inode
>>>> numbers" -- (very technical hint) you may need to permute the bit 
>>>> order
>>>> before you discern a simple pattern...
>>>>
>>>>
>>>>
>>>> From:   "Luis Bolinches" <luis.bolinches at fi.ibm.com>
>>>> To:     gpfsug-discuss at spectrumscale.org
>>>> Cc:     gpfsug-discuss at spectrumscale.org
>>>> Date:   05/18/2017 02:10 AM
>>>> Subject:        Re: [gpfsug-discuss] mmbackup with fileset : scope
>>> errors
>>>> Sent by: gpfsug-discuss-bounces at spectrumscale.org
>>>>
>>>>
>>>>
>>>> Hi
>>>>
>>>> There is no direct way to convert the one fileset that is dependent to
>>>> independent or viceversa.
>>>>
>>>> I would suggest to take a look to chapter 5 of the 2014 redbook, lots
>> of
>>>> definitions about GPFS ILM including filesets
>>>> http://www.redbooks.ibm.com/abstracts/sg248254.html?Open Is not the
>> only
>>>> place that is explained but I honestly believe is a good single start
>>>> point. It also needs an update as does nto have anything on CES nor
>> ESS,
>>>> so anyone in this list feel free to give feedback on that page people
>>> with
>>>> funding decisions listen there.
>>>>
>>>> So you are limited to either migrate the data from that fileset to a
>> new
>>>> independent fileset (multiple ways to do that) or use the TSM client
>>>> config.
>>>>
>>>> ----- Original message -----
>>>> From: "Jaime Pinto" <pinto at scinet.utoronto.ca>
>>>> Sent by: gpfsug-discuss-bounces at spectrumscale.org
>>>> To: "gpfsug main discussion list" <gpfsug-discuss at spectrumscale.org>,
>>>> "Jaime Pinto" <pinto at scinet.utoronto.ca>
>>>> Cc:
>>>> Subject: Re: [gpfsug-discuss] mmbackup with fileset : scope errors
>>>> Date: Thu, May 18, 2017 4:43 AM
>>>>
>>>> There is hope. See reference link below:
>>>>
>>>
>> https://www.ibm.com/support/knowledgecenter/en/STXKQY_4.1.1/com.ibm.spectrum.scale.v4r11.ins.doc/bl1ins_tsm_fsvsfset.htm 
>>
>>
>>>
>>>>
>>>>
>>>> The issue has to do with dependent vs. independent filesets, something
>>>> I didn't even realize existed until now. Our filesets are dependent
>>>> (for no particular reason), so I have to find a way to turn them into
>>>> independent.
>>>>
>>>> The proper option syntax is "--scope inodespace", and the error
>>>> message actually flagged that out, however I didn't know how to
>>>> interpret what I saw:
>>>>
>>>>
>>>> # mmbackup /gpfs/sgfs1/sysadmin3 -N tsm-helper1-ib0 -s /dev/shm
>>>> --scope inodespace --tsm-errorlog $logfile -L 2
>>>> --------------------------------------------------------
>>>> mmbackup: Backup of /gpfs/sgfs1/sysadmin3 begins at Wed May 17
>>>> 21:27:43 EDT 2017.
>>>> --------------------------------------------------------
>>>> Wed May 17 21:27:45 2017 mmbackup:mmbackup: Backing up *dependent*
>>>> fileset sysadmin3 is not supported
>>>> Wed May 17 21:27:45 2017 mmbackup:This fileset is not suitable for
>>>> fileset level backup.  exit 1
>>>> --------------------------------------------------------
>>>>
>>>> Will post the outcome.
>>>> Jaime
>>>>
>>>>
>>>>
>>>> Quoting "Jaime Pinto" <pinto at scinet.utoronto.ca>:
>>>>
>>>>> Quoting "Luis Bolinches" <luis.bolinches at fi.ibm.com>:
>>>>>
>>>>>> Hi
>>>>>>
>>>>>> have you tried to add exceptions on the TSM client config file?
>>>>>
>>>>> Hey Luis,
>>>>>
>>>>> That would work as well (mechanically), however it's not elegant or
>>>>> efficient. When you have over 1PB and 200M files on scratch it will
>>>>> take many hours and several helper nodes to traverse that fileset 
>>>>> just
>>>>> to be negated by TSM. In fact exclusion on TSM are just as
>> inefficient.
>>>>> Considering that I want to keep project and sysadmin on different
>>>>> domains then it's much worst, since we have to traverse and exclude
>>>>> scratch & (project|sysadmin) twice, once to capture sysadmin and 
>>>>> again
>>>>> to capture project.
>>>>>
>>>>> If I have to use exclusion rules it has to rely sole on gpfs rules,
>> and
>>>>> somehow not traverse scratch at all.
>>>>>
>>>>> I suspect there is a way to do this properly, however the examples on
>>>>> the gpfs guide and other references are not exhaustive. They only 
>>>>> show
>>>>> a couple of trivial cases.
>>>>>
>>>>> However my situation is not unique. I suspect there are may 
>>>>> facilities
>>>>> having to deal with backup of HUGE filesets.
>>>>>
>>>>> So the search is on.
>>>>>
>>>>> Thanks
>>>>> Jaime
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>
>>>>>> Assuming your GPFS dir is /IBM/GPFS and your fileset to exclude is
>>>> linked
>>>>>> on /IBM/GPFS/FSET1
>>>>>>
>>>>>> dsm.sys
>>>>>> ...
>>>>>>
>>>>>> DOMAIN /IBM/GPFS
>>>>>> EXCLUDE.DIR /IBM/GPFS/FSET1
>>>>>>
>>>>>>
>>>>>> From:   "Jaime Pinto" <pinto at scinet.utoronto.ca>
>>>>>> To:     "gpfsug main discussion list"
>>>> <gpfsug-discuss at spectrumscale.org>
>>>>>> Date:   17-05-17 23:44
>>>>>> Subject:        [gpfsug-discuss] mmbackup with fileset : scope 
>>>>>> errors
>>>>>> Sent by:        gpfsug-discuss-bounces at spectrumscale.org
>>>>>>
>>>>>>
>>>>>>
>>>>>> I have a g200 /gpfs/sgfs1 filesystem with 3 filesets:
>>>>>> * project3
>>>>>> * scratch3
>>>>>> * sysadmin3
>>>>>>
>>>>>> I have no problems mmbacking up /gpfs/sgfs1 (or sgfs1), however we
>>>>>> have no need or space to include *scratch3* on TSM.
>>>>>>
>>>>>> Question: how to craft the mmbackup command to backup
>>>>>> /gpfs/sgfs1/project3 and/or /gpfs/sgfs1/sysadmin3 only?
>>>>>>
>>>>>> Below are 3 types of errors:
>>>>>>
>>>>>> 1) mmbackup /gpfs/sgfs1/sysadmin3 -N tsm-helper1-ib0 -s /dev/shm
>>>>>> --tsm-errorlog $logfile -L 2
>>>>>>
>>>>>> ERROR: mmbackup: Options /gpfs/sgfs1/sysadmin3 and --scope 
>>>>>> filesystem
>>>>>> cannot be specified at the same time.
>>>>>>
>>>>>> 2) mmbackup /gpfs/sgfs1/sysadmin3 -N tsm-helper1-ib0 -s /dev/shm
>>>>>> --scope inodespace --tsm-errorlog $logfile -L 2
>>>>>>
>>>>>> ERROR: Wed May 17 16:27:11 2017 mmbackup:mmbackup: Backing up
>>>>>> dependent fileset sysadmin3 is not supported
>>>>>> Wed May 17 16:27:11 2017 mmbackup:This fileset is not suitable for
>>>>>> fileset level backup.  exit 1
>>>>>>
>>>>>> 3) mmbackup /gpfs/sgfs1/sysadmin3 -N tsm-helper1-ib0 -s /dev/shm
>>>>>> --scope filesystem --tsm-errorlog $logfile -L 2
>>>>>>
>>>>>> ERROR: mmbackup: Options /gpfs/sgfs1/sysadmin3 and --scope 
>>>>>> filesystem
>>>>>> cannot be specified at the same time.
>>>>>>
>>>>>> These examples don't really cover my case:
>>>>>>
>>>>
>>>
>> https://www.ibm.com/support/knowledgecenter/en/STXKQY_4.2.3/com.ibm.spectrum.scale.v4r23.doc/bl1adm_mmbackup.htm#mmbackup__mmbackup_examples 
>>
>>
>>>
>>>>
>>>>>>
>>>>>>
>>>>>> Thanks
>>>>>> Jaime
>>>>>>
>>>>>>
>>>>>>          ************************************
>>>>>>           TELL US ABOUT YOUR SUCCESS STORIES
>>>>>>          http://www.scinethpc.ca/testimonials
>>>>>>          ************************************
>>>>>> ---
>>>>>> Jaime Pinto
>>>>>> SciNet HPC Consortium - Compute/Calcul Canada
>>>>>> www.scinet.utoronto.ca - www.computecanada.ca
>>>>>> University of Toronto
>>>>>> 661 University Ave. (MaRS), Suite 1140
>>>>>> Toronto, ON, M5G1M1
>>>>>> P: 416-978-2755
>>>>>> C: 416-505-1477
>>>>>>
>>>>>> ----------------------------------------------------------------
>>>>>> This message was sent using IMP at SciNet Consortium, University of
>>>>>> Toronto.
>>>>>>
>>>>>> _______________________________________________
>>>>>> gpfsug-discuss mailing list
>>>>>> gpfsug-discuss at spectrumscale.org
>>>>>> http://gpfsug.org/mailman/listinfo/gpfsug-discuss
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Ellei edellä ole toisin mainittu: / Unless stated otherwise above:
>>>>>> Oy IBM Finland Ab
>>>>>> PL 265, 00101 Helsinki, Finland
>>>>>> Business ID, Y-tunnus: 0195876-3
>>>>>> Registered in Finland
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>          ************************************
>>>>>           TELL US ABOUT YOUR SUCCESS STORIES
>>>>>          http://www.scinethpc.ca/testimonials
>>>>>          ************************************
>>>>> ---
>>>>> Jaime Pinto
>>>>> SciNet HPC Consortium - Compute/Calcul Canada
>>>>> www.scinet.utoronto.ca - www.computecanada.ca
>>>>> University of Toronto
>>>>> 661 University Ave. (MaRS), Suite 1140
>>>>> Toronto, ON, M5G1M1
>>>>> P: 416-978-2755
>>>>> C: 416-505-1477
>>>>>
>>>>> ----------------------------------------------------------------
>>>>> This message was sent using IMP at SciNet Consortium, University of
>>>> Toronto.
>>>>>
>>>>> _______________________________________________
>>>>> gpfsug-discuss mailing list
>>>>> gpfsug-discuss at spectrumscale.org
>>>>> http://gpfsug.org/mailman/listinfo/gpfsug-discuss
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>           ************************************
>>>>            TELL US ABOUT YOUR SUCCESS STORIES
>>>>           http://www.scinethpc.ca/testimonials
>>>>           ************************************
>>>> ---
>>>> Jaime Pinto
>>>> SciNet HPC Consortium - Compute/Calcul Canada
>>>> www.scinet.utoronto.ca - www.computecanada.ca
>>>> University of Toronto
>>>> 661 University Ave. (MaRS), Suite 1140
>>>> Toronto, ON, M5G1M1
>>>> P: 416-978-2755
>>>> C: 416-505-1477
>>>>
>>>> ----------------------------------------------------------------
>>>> This message was sent using IMP at SciNet Consortium, University of
>>>> Toronto.
>>>>
>>>> _______________________________________________
>>>> gpfsug-discuss mailing list
>>>> gpfsug-discuss at spectrumscale.org
>>>> http://gpfsug.org/mailman/listinfo/gpfsug-discuss
>>>>
>>>>
>>>>
>>>> Ellei edellä ole toisin mainittu: / Unless stated otherwise above:
>>>> Oy IBM Finland Ab
>>>> PL 265, 00101 Helsinki, Finland
>>>> Business ID, Y-tunnus: 0195876-3
>>>> Registered in Finland
>>>> _______________________________________________
>>>> gpfsug-discuss mailing list
>>>> gpfsug-discuss at spectrumscale.org
>>>> http://gpfsug.org/mailman/listinfo/gpfsug-discuss
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>           ************************************
>>>            TELL US ABOUT YOUR SUCCESS STORIES
>>>           http://www.scinethpc.ca/testimonials
>>>           ************************************
>>> ---
>>> Jaime Pinto
>>> SciNet HPC Consortium - Compute/Calcul Canada
>>> www.scinet.utoronto.ca - www.computecanada.ca
>>> University of Toronto
>>> 661 University Ave. (MaRS), Suite 1140
>>> Toronto, ON, M5G1M1
>>> P: 416-978-2755
>>> C: 416-505-1477
>>>
>>> ----------------------------------------------------------------
>>> This message was sent using IMP at SciNet Consortium, University of
>>> Toronto.
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>>           ************************************
>>            TELL US ABOUT YOUR SUCCESS STORIES
>>           http://www.scinethpc.ca/testimonials
>>           ************************************
>> ---
>> Jaime Pinto
>> SciNet HPC Consortium - Compute/Calcul Canada
>> www.scinet.utoronto.ca - www.computecanada.ca
>> University of Toronto
>> 661 University Ave. (MaRS), Suite 1140
>> Toronto, ON, M5G1M1
>> P: 416-978-2755
>> C: 416-505-1477
>>
>> ----------------------------------------------------------------
>> This message was sent using IMP at SciNet Consortium, University of
>> Toronto.
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
>          ************************************
>           TELL US ABOUT YOUR SUCCESS STORIES
>          http://www.scinethpc.ca/testimonials
>          ************************************
> ---
> Jaime Pinto
> SciNet HPC Consortium - Compute/Calcul Canada
> www.scinet.utoronto.ca - www.computecanada.ca
> University of Toronto
> 661 University Ave. (MaRS), Suite 1140
> Toronto, ON, M5G1M1
> P: 416-978-2755
> C: 416-505-1477
>
> ----------------------------------------------------------------
> This message was sent using IMP at SciNet Consortium, University of 
> Toronto.
>
> _______________________________________________
> gpfsug-discuss mailing list
> gpfsug-discuss at spectrumscale.org
> http://gpfsug.org/mailman/listinfo/gpfsug-discuss

-- 
*Jez Tucker*
Head of Research and Development, Pixit Media
07764193820 | jtucker at pixitmedia.com <mailto:jtucker at pixitmedia.com>
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