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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nick Majeran Sent: Thursday, July 05, 2007 7:10 PM To: Dellaripa, Rich Cc: Rajmund Siwik; veritas-bu@mailman.eng.auburn.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 <[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 _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu