Dear All,
Thanks a lot to all who have replied.

Srinivas.

-----Original Message-----
From: Legato NetWorker discussion
[mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]On Behalf Of Matthew Huff
Sent: 2005 Aug 25 12:59 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Best Method to backup NetApp Filers....


We have two clustered NetApp F940 as well. We are using Legato 7.2 with NDMP
to back them up across the network (not via NFS or CIFS) to a STKL180 with 6
x LTO-2 drives that are also used by our Network server for other clients.
The advantange with this is that you can parallel streams and integration
with our other storage pools. The important thing is to setup a 2nd Gigabit
interface in all the NetApps and the backup server and tune the TCP/IP
parameters including using Jumbo frames (very important).

We can do a full backup of 7 TB in just under 12 hours. We could do this in
signifcantly less time if we could breakup one multi-terrabyte volume into
multiple qtrees and run parallel streams.

Here are some of the tcp tunnables (via Solaris)

ndd -set /dev/tcp tcp_max_buf    4194304
ndd -set /dev/tcp tcp_cwnd_max   2097152
ndd -set /dev/tcp tcp_xmit_hiwat 1048576
ndd -set /dev/tcp tcp_recv_hiwat 1048576
ndd -set /dev/tcp tcp_tstamp_always 1
ndd -set /dev/tcp tcp_wscale_always 1

----
Matthew Huff           | One Manhattanville Rd
Director of Operations | Purchase, NY 10577
OTA LLC                | Phone: 914-460-4039
http://www.otaotr.com  | Fax:   914-460-4139

> -----Original Message-----
> From: Legato NetWorker discussion
> [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On Behalf Of Robert Maiello
> Sent: Wednesday, August 24, 2005 11:24 AM
> To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
> Subject: Re: [Networker] Best Method to backup NetApp Filers....
>
> We use NDMP as well.   The FC tape drives are added to
> Networker as NMDP
> devices...the filer essentially "owns" the tape drives, the
> Networker server "owns" and controls the libary arm.
>
>
> Ronny,
>
> How have you been dealing with tape errors in your NDMP
> evironment?  This, to me, seems to be one of the NDMP
> drawbacks..tape errors don't get communicated to Networker
> well and result in backup failures?  The NetApp logging
> leaves a lot to be desired also.
>
>
> Robert Maiello
> Pioneer Data Systems
>
>
>
>
>
> On Wed, 24 Aug 2005 14:51:53 +0200, Ronny Egner
> <ronny.egner AT SIV DOT DE> wrote:
>
> >Srinivas Rao wrote:
> >
> >> Dear Networkers,
> >> As I am new to NetApp filers and NDMP, I would like to
> know the best
> >> cost effective method to backup NetApp Filer by using Legato
> >> Networker. Please also let me know the licenses required.
> >
> >Hi,
> >
> >we backup our NetApp filer by using NDMP. So far no problem.
> >The tape device is connected to the filer directly via fc.
> >
> >AFAIK legato does not support serverless backups (i.e. the
> data flows
> >from the netapp filer directly into the tape library over tcp/ip)....
> >
> >You need one NDMP licencse
>  per filer (i.e. if you have a clustered
> >filer you need two ndmp licences...)
> >
> >
> >Hope that helps....
> >
> >--
> >
> >
> >
> >Mit freundlichen Gr��en
> >
> >Ronny Egner
> >
> >SIV.AG
> >Konrad-Zuse-Stra�e 1
> >18184 Roggentin
> >
> >Telefon: +49 (0)3 81 / 25 24 422
> >Telefax: +49 (0)3 81 / 25 24 399
> >
> >mailto:ronny.egner AT siv DOT de
> >http://www.siv.de
>
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