Re: [Networker] Netapp, ndmp, and incremental backups.
2005-06-17 13:55:17
This is exactly the true behavior of the "differential" backup levels as
originally defined by the Unix "dump/backup command" .
I would say that Netapp miss-used the term incremental...
Itzik
> -----Original Message-----
> From: Legato NetWorker discussion
> [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On Behalf Of Ernst Bokkelkamp
> Sent: Friday, June 17, 2005 20:30
> To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> Subject: Re: [Networker] Netapp, ndmp, and incremental backups.
>
> Very strange, can you explain the following lines:
>
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of this level
> 1 dump: Mon Jun 13 17:30:12 2005.
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of last level 0 dump: Sun Jun 12 17:30:10 2005.
>
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of this level
> 2 dump: Tue Jun 14 17:30:09 2005.
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of last level
> 1 dump: Mon Jun 13 17:30:12 2005.
>
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of this level
> 3 dump: Wed Jun 15 17:30:10 2005.
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of last level
> 2 dump: Tue Jun 14 17:30:09 2005.
>
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of this level
> 4 dump: Thu Jun 16 17:30:09 2005.
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of last level
> 3 dump: Wed Jun 15 17:30:10 2005.
>
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of this level
> 5 dump: Fri Jun 17 17:30:21 2005.
> * fth02n:/vol/vol0 nsrndmp_save: NDMP Service Log: DUMP: Date
> of last level
> 4 dump: Thu Jun 16 17:30:09 2005.
>
> And the following from the NetApp documentation:
>
> LEVEL 0-9 Default 0
> Specifies the backup level. Level 0 copies the entire
> dataset. Incremental backup levels, specified by values above
> 0, copy all files new or modified since the last incremental
> backup. For example, a level 1 backs up new or modified files
> since the level 0 backup, a level 2 backs up new or modified
> files since the level 1 backup, and so on.
>
> Tape Backup and Recovery Guide Data ONTAP 7.0 pg.162
>
>
> Bye
> Ernie
>
> -----Original Message-----
> From: Joel Krajden [mailto:joelk AT encs.concordia DOT ca]
> Sent: Friday, June 17, 2005 4:20 PM
> To: Legato NetWorker discussion; Ernst Bokkelkamp
> Subject: Re: [Networker] Netapp, ndmp, and incremental backups.
>
>
> NetApp NDMP only supports levels 0, 1, and 2. So you have to
> work with a
> schedule in Networker that is more restricted.
>
> Joel
>
> Ernst Bokkelkamp wrote:
> > (sorry, finger problems cause previous message to leave before I
> > finished
> > it)
> >
> > You are absolutely right, subsequent level 1 backups do not work.
> >
> > Please note that you must look very carefully at the exact
> wording and
> > the placement of the level description in the documentation. Full
> > followed by multiple level 1 does function like incremental
> on normal
> > (not NDMP) backups and most likely NDMP backups, and also not with
> > NetApp. The description being referred to is a "generic"
> and does not
> > apply to Ontap. You must consider that the level is passed
> on to the
> > dump application, and the NetApp dump command works differently (it
> > does not know incremental).
> >
> >>From a previous message on NetApp dump levels:
> >
> >
> >> 0-9 Dump levels. A level 0, full backup, guarantees
> the entire file
> >> system is copied. A level number above 0,
> incremental backup,
> >> tells dump to copy all files new or modified
> since the last
> >> dump
> >
> > of
> >
> >> a lower level.
> >>
> >> The default dump level is 0.
> >
> >
> > The wording of the Networker manual (glossary) differs slightly:
> >
> > A full (f) backup backs up all files, regardless of
> > whether they have changed. Levels one through nine
> > [1-9] back up files that have changed since the last
> > lower numbered backup level. An incremental (incr)
> > backup backs up only files that have changed since the
> > last backup.
> >
> > And in the admin manual the following explenation can be found:
> >
> > . A level 1 backup backs up all files that have changed
> since the most
> > recent full backup (considered a level zero). . A level 3
> backup backs
> > up all files that have changed since the most recent backup
> of level
> > 2, level 1, or full backup. For example, if the most recent
> backup was
> > at level full, then a level 3 backup backs up all files
> that changed
> > since the full backup. However, if the most recent backup
> was at level
> > 2, then a level 3 backup backs up only those files changed
> since the
> > level 2 backup. . A level 9 backs up all the files that
> have changed
> > since the most recent backup of any level except level 9.
> >
> >>From the above you can conclude that the only method to mimic
> >>incremental
> > backup is to do a full backup followed by increasing
> levels. Such as
> > Full,1,2,3,4,5,6,7,8,9. This implies that the number of
> incrementals
> > can't exceed 9 in total.
> >
> > However, incremental will not work with NetApp if you forget to
> > specify "UPDATE=Y". This parameter actually instructs Ontap NDMP to
> > update the dumpdates file which is used to determine what should be
> > backed up.
> >
> > Bye
> > Ernie
> >
> >
> > -----Original Message-----
> > From: Legato NetWorker discussion
> > [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On Behalf Of Randy Doering
> > Sent: Thursday, June 16, 2005 10:28 PM
> > To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> > Subject: Re: [Networker] Netapp, ndmp, and incremental backups.
> >
> >
> > I've been meaning to ask a question about that paragraph,
> but hadn't
> > gotten around to it. I don't think that subsequent Level 1 backups
> > will function like incremental backups. A Level 1 on Day 2
> goes back
> > to the Day 1 Full, but a Level 1 on Day 3 will als o go back to the
> > Day1 Full (including what had already been backed up on Day 2).
> >
> > Is this correct?
> >
> > Thanks,
> > Randy
> >
> > -------------- Original message --------------
> >
> >
> >>>>From the NW 7.1 documentation CD (May 2004), the Unix
> administrator
> >>>guide, in the NDMP chapter, under "limitations ...(p.532):
> >>>* The NetWorker software does not support incremental backup
> >>>settings
> >>>for NDMP backups. If you select the incremental setting,
> the NetWorker
> >>>server performs a full backup. However, you can schedule
> level backups
> >>>to function like incremental backups. For example, complete a full
> >>>backup on day 1 and level 1 backups on days 2 through 7.
> >>>Itzik
> >>
> >>Thank you. It's the same wording in the 7.2 manual, but I completely
> >>overlooked it.
> >>
> >>
> >>--
> >>Darren Dunham ddunham AT taos DOT com
> >>Senior Technical Consultant TAOS http://www.taos.com/
> >>Got some Dr Pepper? San Francisco, CA bay area
> >>< This line left intentionally blank to confuse you. >
> >>
> >>--
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> >>also view and post messages to the list. Questions
> regarding this list
> >>should be sent to stan AT temple DOT edu
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> >
> >
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>
> --
> | Joel Krajden | Rm: EV-105, Tel: 514 848-2424
> 3052 |
> | | Fax: 514 848-2830
> |
> | Senior Systems Analyst | Email: joelk AT encs.concordia DOT ca
> |
> | Engineering & Computer Sc.|
> http://www.cs.concordia.ca/~staffcs/joelk |
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>
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--
Note: To sign off this list, send a "signoff networker" command via email
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http://listserv.temple.edu/archives/networker.html where you can
also view and post messages to the list. Questions regarding this list
should be sent to stan AT temple DOT edu
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- Re: [Networker] Netapp, ndmp, and incremental backups., (continued)
- Re: [Networker] Netapp, ndmp, and incremental backups., Itzik Meirson
- Re: [Networker] Netapp, ndmp, and incremental backups., Randy Doering
- Re: [Networker] Netapp, ndmp, and incremental backups., Itzik Meirson
- Re: [Networker] Netapp, ndmp, and incremental backups., Ernst Bokkelkamp
- Re: [Networker] Netapp, ndmp, and incremental backups.,
Itzik Meirson <=
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