Yes, I've found the same; with direct NDMP, the SIZE_DATA_BUFFERS_NDMP
must match, however, three-way NDMP is less picky.
On 7/5/07, Adams, Dwayne <AdamsDC AT medsch.ucsf DOT edu> wrote:
> I did some testing with SIZE_DATA_BUFFERS_NDMP using direct attached and
> I think the setting is not used by my filer, but the buffers size you
> set must match the buffer size in the filer configuration. So there is
> a connection between this setting and the local filer buffer size. If
> they don't match I get I/O errors.
>
> Dwayne Adams
>
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Curtis
> Preston
> Sent: Thursday, July 05, 2007 11:32 AM
> To: Nick Majeran; Dellaripa, Rich
> Cc: Rajmund Siwik; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] VTL with NDMP
>
> I _BELIEVE_ that SIZE_DATA_BUFFERS_NDMP applies only to 3rd party NDMP
> backups that are sent to a NetBackup server. If you're doing filer to
> self or filer to filer backups (3rd party backups to another filer),
> then I don't think that SIZE_DATA_BUFFERS_NDMP applies. When NetBackup
> is telling a filer to dump to himself or to another filer, I believe the
> only thing it does it begin the process and then stand back and wait for
> it to finish, and for the NDMP server tell the NetBackup server what it
> backed up.
>
> ---
> W. Curtis Preston
> Backup Blog @ www.backupcentral.com
> VP Data Protection, GlassHouse Technologies
>
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Nick
> Majeran
> Sent: Thursday, July 05, 2007 7:10 PM
> To: Dellaripa, Rich
> Cc: Rajmund Siwik; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] VTL with NDMP
>
> Again, let me reiterate: I have not attempted to tune NDMP backups
> from a NetApp filer to LTO-3 tape. All of my tests were conducted
> from EMC Celerra NSX NAS devices.
>
> However, one thing you should be able to tune, and which is quite
> easy, is SIZE_DATA_BUFFERS_NDMP. By default, Netbackup uses a 63k
> block size for NDMP based backups. Obviously, increasing that from
> the default to something more practical, like say (256k), increases
> speed writing to tape. LTO-3 supports a maximum block size of
> 2097152 bytes.
>
> On a Celerra, you can configure the PAX parameters below:
>
> param_name facility default current
> configured
> paxWriteBuff PAX 64 64
> dump PAX 0 0
> allowVLCRestoreToUFS PAX 0 0
> checkUtf8Filenames PAX 1 1
> paxStatBuff PAX 128 128
> readWriteBlockSizeInKB PAX 64 64
> filter.numFileFilter PAX 5 5
> paxReadBuff PAX 64 64
> filter.numDirFilter PAX 5 5
> noFileStreams PAX 0 0
> nFTSThreads PAX 8 8
> scanOnRestore PAX 1 1
> filter.caseSensitive PAX 1 1
> nPrefetch PAX 8 8
> nRestore PAX 16 16
> writeToArch PAX 1 1
> writeToTape PAX 1 1
> nThread PAX 64 64
>
> So, there are quite a few parameters to configure from a NDMP
> standpoint on a Celerra.
>
> -- nick
>
> On 7/5/07, Dellaripa, Rich <RD1423 AT att DOT com> wrote:
> > I second that inquiry...it was my understanding there wasn't much you
> > could do to tune NDMP backups.
> >
> > ---Rich Dellaripa
> >
> > -----Original Message-----
> > From: Rajmund Siwik [mailto:Rajmund.Siwik AT conexant DOT com]
> > Sent: Tuesday, July 03, 2007 4:35 PM
> > To: Nick Majeran; veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: Re: [Veritas-bu] VTL with NDMP
> >
> > What kind of tuning you are doing on NetApps to get that speed?
> >
> > >
> > > I have newer and older Net App boxes, assuming a 2GB san, what
> > performance can I expect using NDMP?
> > >
> > Out of the box, untuned, 50-80 MB/s to LTO-3. Tuned, 70-160 MB/s.
> >
> >
> > -- nick
> >
> > >
> > > Thanks in advance!
> > >
> > > Paul Kenny
> > >
> > >
> >
> +----------------------------------------------------------------------
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> > >
> >
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