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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