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 <[EMAIL PROTECTED]> 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:[EMAIL PROTECTED] > Sent: Tuesday, July 03, 2007 4:35 PM > To: Nick Majeran; veritas-bu@mailman.eng.auburn.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 > > > > > +---------------------------------------------------------------------- > > |This was sent by [EMAIL PROTECTED] via Backup Central. > > |Forward SPAM to [EMAIL PROTECTED] > > > +---------------------------------------------------------------------- > _______________________________________________ > Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu > > Conexant E-mail Firewall (Conexant.Com) made the following > annotations------------------------------------------------------------- > --------********************** Legal Disclaimer > **************************** > > "This email may contain confidential and privileged material for the > sole use of the intended recipient. Any unauthorized review, use or > distribution by others is strictly prohibited. If you have received the > message in error, please advise the sender by reply email and delete the > message. Thank you." > > ********************************************************************** > > --------------------------------------------------------------------- > > > _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu