Re: [Networker] Problem with NDMP devices

Coty, Edward wrote:

 Stan,

I would love to hear the performance of multiplexing NDMP backups to

non-NDMP devices over the network.

I am able to run at LTO-2 speed on a Sun 280R with Solaris 9. We arealso multiplexing NDMP and non-NDMP streams to the same adv_file devicewith no apparent performance issue. The issue we have with this setup iswith restores. It seems that when Networker is encapsulating an NDMPbackup stream on the tape, it needs to restore (or at least reportabout) larger chunks of data (or so it seems on the console):

10/21/07 12:00:08 nsrd: fas3050.tau.ac.il:/vol/mail (10/09/07) startingread from 000302 of 271 GB10/21/07 12:18:36 nsrd: fas3050.tau.ac.il:/vol/mail (10/09/07) donereading 400 MB

10/21/07 12:18:36 nsrd: legato.tau.ac.il:/vol/mail done browsing

I cannot really say that I can see some impact on recovery speed. Itdoes, however, causes inexperienced users to call me asking about thislarge recovery size.



EDWARD COTY
LEAD STORAGE ENGINEER, LCNA, NACP
WORK - 973-533-2098
CELL - 973-296-0918
EDWARD.COTY AT AIG DOT COM

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Stan Horwitz
Sent: Friday, October 19, 2007 3:55 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Problem with NDMP devices

On Oct 19, 2007, at 2:25 PM, Coty, Edward wrote:

I would rebuild your jukebox and say yes at is this an ndmp device.Also
make sure the username and password are correct when you enter.


Rebuilding my jukebox is an option I prefer to avoid. I had a WebEx with
EMC and than a follow-up phone call. They are investigating the problem.
In the meanwhile, their recommendation is that I do DSA NDMP backups to
non-NDMP devices. I am trying that now with two clients and its working.
I intend to test doing a recover on Monday. If the recover works, I
definitely prefer the DSA method since it means I won't have to set
aside five tape drives just for NDMP purposes.

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--

-- Yaron.

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