Veritas-bu

Re: [Veritas-bu] VTL with NDMP

2007-07-05 14:45:43
Subject: Re: [Veritas-bu] VTL with NDMP
From: <Courtenay.Jones AT wolseley DOT com>
To: <nmajeran AT gmail DOT com>, <RD1423 AT att DOT com>
Date: Thu, 5 Jul 2007 14:31:24 -0400
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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