EMC actually has a whole written guide to tuning the Celerra.
You can get it off of powerlink.
-----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 2:10 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
> >
> >
>
+----------------------------------------------------------------------
> > |This was sent by Patkenny AT comcast DOT net via Backup Central.
> > |Forward SPAM to abuse AT backupcentral DOT com.
> >
>
+----------------------------------------------------------------------
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