What kind of data are you backing up? I am backing up file share
data(word,excel,PST) directly to tape. Drives are local to NDMP filer. I
am only seeing on average 27MBs. I am using LTOII drives. What kind of
hardware are you using? Do you have hardware compression on? How many
NDMP streams are you sending to one tape drive? The performance can just
depend on the type of data and the network you are running on? 

EDWARD COTY
OPEN SYSTEMS STORAGE ENGINEER, LCNA
WORK - 973-533-2098
CELL - 973-296-0918
EDWARD.COTY AT AIG DOT COM
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On Behalf Of bob flynn
Sent: Tuesday, July 18, 2006 3:46 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] NDMP over network speed question

Hi,

I have the following configuration

    * Networker Server 7.2.2
    * SCSI attached LTO2 drives
    * Linux RH 3 AS

Netapp filers running NDMP over network, streaming data to backup
server.

My question is to clarify my understanding of expected speeds of NDMP
backups.

What I think happens is;

    * Networker server requests an ndmp backup from filer.
    * Filer commences ndmp backup.
    * ndmp backup runs through the ndmp phases. Once a tree walk of the
      data is complete, and the file indexes have been created, it
      starts streaming data to the backup server.

My question is;

I expect the job to work as follows;

    * First phases, no data streamed
    * Once index is created, stream this data across
    * Once data is being streamed, a solid stream of data from the filer
      to backup server.

What I see is;

    * First phases, no data streamed
    * Once index is created, a trickle of data
    * Once data is being streamed, data seems to spurt, ie
fast/slow/fast.

What characteristics of ndmp data streaming should I see. Can I run any
tests to verify expected v's actual data rates, to determine if I am
bottlenecking backups at;

    * Filer ( CPU )
    * Filer ( Network )
    * Network
    * Backup Server ( CPU )
    * Backup Server ( network )
    * Backup Server ( tapedrive )

I am currently monitoring the following;

    * Filer ( CPU )
    * Filer ( NIC )
    * Network
    * Backup Server ( CPU )
    * Backup Server ( NIC )

and am not seeing bottlenecks, but still seeing erratic backup
performance.

Any hints to either understand this further, and baseline performance
are appreciated.

-Bob







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