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 <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Curtis > Preston > Sent: Thursday, July 05, 2007 11:32 AM > To: Nick Majeran; Dellaripa, Rich > Cc: Rajmund Siwik; veritas-bu@mailman.eng.auburn.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: [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. 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