I could'nt find much difference on the speed though, the IO traffic showed
some. However, I don't think this gives a genuine picture as other groups that
parallely run along with the tested group, do write the indexes. I wanted to
know the limitations, if any, before changing the configuration of all the
groups not to backup the indexes.
I'd update this group on the performance, once I run all the backups without
the index.
Thanks and regards
- Krishnan
> -----Original Message-----
> From: Itzik Meirson [mailto:imeirson AT MBI.CO DOT IL]
> Sent: 23 March 2004 11:32
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: Re: [Networker] Slow filer backups
>
>
> You will loose the possibility to do "file recoveries" based on the
> "index" - list of files backed up. Your only possibility will be to
> recover the whole saveset or read the whole saveset bit by bit while
> searching for a specific file.
> You did not mention if skipping the index generation provided you with
> better performance...
> Itzik
>
> > -----Original Message-----
> > From: Legato NetWorker discussion
> [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU] On Behalf Of Krishnan,
> > Ramamurthy (Temp)
> > Sent: Tuesday, March 23, 2004 12:05
> > To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> > Subject: Re: [Networker] Slow filer backups
> >
> > Are there any other intricacies in not backing up the
> indexes? What I
> gain is visible. Is there
> > something I'd lose if I don't backup the index files (such as file
> level recovery not possible
> > etc.,)?
> >
> > Thanks
> >
> > - Krishnan
> >
> > > -----Original Message-----
> > > From: Itzik Meirson [mailto:imeirson AT MBI.CO DOT IL]
> > > Sent: 11 March 2004 17:10
> > > To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> > > Subject: Re: [Networker] Slow filer backups
> > >
> > >
> > > It seems you are hitting a bottle neck with indexes generation.
> > > Assuming you have N NDMP drives, the Netapp will send N
> > > independent data
> > > streams to your backup server containing the list of files backed
> up.
> > > This data is all kept in /nsr/tmp.
> > > Once the Netapp finishes with a saveset your backup server will
> start
> > > massaging the accumulated index files and create the
> actual indexes
> in
> > > /nsr/index/Netapp directory.
> > > During this massaging time, there are no backups to the specific
> drive
> > > that just finished the NDMP portion of the backup. This
> "drive idle
> > > time" will actually reduce the total average throughput you
> > > see for the
> > > drive.
> > > So I would assume that your /nsr/tmp or even the whole /nsr
> filesystem
> > > is overloaded during these backups.
> > > I would suggest that you look at the I/O utilization of the /nsr
> > > filesystem.
> > >
> > > One way (at least for test) to avoid this overhead would be to
> > > completely suppress index generation for the NDMP backups.
> > > This could be
> > > accomplished by specifying HIST=N as the only application data
> > > information.
> > > Itzik
> > >
> > >
> > > > -----Original Message-----
> > > > From: Legato NetWorker discussion
> > > [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU] On Behalf Of Krishnan,
> > > > Ramamurthy (Temp)
> > > > Sent: Thursday, March 11, 2004 16:22
> > > > To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> > > > Subject: Re: [Networker] Slow filer backups
> > > >
> > > > Matt
> > > >
> > > > - They are LTO-1 drives
> > > > - OnTap version is 6.4.2 P9
> > > > - Backing up volumes.
> > > >
> > > > thanks
> > > >
> > > > - Krishnan
> > > >
> > > > -----Original Message-----
> > > > From: Matthew Huff [mailto:mhuff AT ox DOT com]
> > > > Sent: 11 March 2004 14:11
> > > > To: Legato NetWorker discussion; Krishnan, Ramamurthy (Temp)
> > > > Subject: RE: [Networker] Slow filer backups
> > > >
> > > >
> > > > Are those LTO-1 or LTO-2 drives? What OnTap version are you
> running?
> > > Are
> > > > you backing up by volume or quota-tree?
> > > >
> > > > ----
> > > > Matthew Huff | One Manhattanville Rd
> > > > Director of Operations | Purchase, NY 10577
> > > > OTA LLC | Phone: 914-460-4039
> > > > http://www.otaotr.com | Fax: 914-460-4139
> > > >
> > > > > -----Original Message-----
> > > > > From: Krishnan, Ramamurthy (Temp)
> > > > > [mailto:Ramamurthy.Krishnan AT KPMG.CO DOT UK]
> > > > > Sent: Thursday, March 11, 2004 8:49 AM
> > > > > To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> > > > > Subject: [Networker] Slow filer backups
> > > > >
> > > > >
> > > > > Hi all
> > > > >
> > > > > We have a set of NetApp 840 Filers that are connected to a
> > > > > ATL P7K through a Gigabit switch. NetWorker 6.1.3 runs on
> > > > > Solaris 8. The total backup size on an avg. is ~2TB a day.
> > > > > The backups do run but are too slow. All the 12 LTO drives
> > > > > of the library won't exceed 12Mb/s speed. The lowest
> > > being 90Kb/s.
> > > > >
> > > > > Is it a normal show? Is there some way by which I can
> > > > > improve the transfer speed, so backups finish faster? Any
> > > > > help is appreciated.
> > > > >
> > > > > TIA
> > > > >
> > > > > - Krishnan
> > > > >
> > > > >
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