BTW, it looks like the DAR support for DSA based backups is available
only from NetWorker 7.3 on. We found our restores going dead slow (not
using DAR) when we tested this option on NetWorker 7.2.2.
Rgds, Ram.
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On Behalf Of Matthew Huff
Sent: 01 August 2006 14:32
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Index File Size?
DSA is short for "Data Server Agent". Look in Chapter 12 of the
Unix/Linux Admin guide for 7.2. It has nice diagrams of the
configuration. Basically, it packages the NDMP datastream (in NetApp's
case, the NetApp modified ufsdump) into a legato stream and sends it
across the network to the Legato server. Local drives are no longer
required
Pro's for DSA
--------------
Support for any Networker device.
No need for DDS (drives are attached to server/storage node)
Multiplexing is supported Backup to Disk is supported Variable block
size (much faster tape performance) No separate storage pool required
(can be multiplexed with other
backups)
Using backups with qtrees, much higher parrallelization can be achieved
Con's for DSA
--------------
Can be a load on the network/nics
Requires custom configuration including tuning
I've got all the Solaris tuning if anyone needs. We use a separate VLAN
with jumbo frames over gigabit ethernet. We tweaked the TCP/IP settings
on the Sun Server (Sun V490 running Solaris 9), and are getting good
performance. The client config in Network Admin is kinda tricky (you
have to use parameters to tell Legato to use a separate NIC for
example). But once it's setup, it is pretty hands-off.
--
Matthew Huff | One Manhattanville Rd
Director of Operations | Purchase, NY 10577
OTA LLC | Phone: 914-460-4039
mailto:mhuff AT ox DOT com | Fax: 914-460-4139
-----Original Message-----
From: John Stoffel [mailto:john.stoffel AT taec.toshiba DOT com]
Sent: Monday, July 31, 2006 1:12 PM
To: Legato NetWorker discussion; Matthew Huff
Subject: Re: Index File Size?
Matthew> With Networker 7.1 you should be looking at DSA backups for the
Matthew> NetApps rather than NFS. With DSA, you can keep the drives
Matthew> attached to your Networker Server and/or Storage Node. The
Matthew> streams are parallel and are treated like any other NetApp
Matthew> backup. I would recommend a seperate VLAN and separate
Matthew> interfaces for the backups including tweaking the backup
Matthew> servers TCP/IP settings and running Jumbo frames, but even if
Matthew> you don't, it should be better than NFS backups.
Interesting. Poking around the http://software.emc.com/... stuff, I
don't see anything explicitly talking about this. I assume this is NDMP
by another name?
The problem I've seen with NDMP is that it barfs with restores of over a
million files, and I have users who have directories/qtrees which exceed
this level. Annoying, yes, but not something I can do anything about.
Matthew> DSA is built-in to Networker (although you have to have NDMP
Matthew> client licenses).
Interesting. Can you give us more details, such as what DSA really
stands for? And how you're using it, if you are using it? I'm always
looking for a better way to backup my NetApps.
Thanks,
John
John Stoffel - Senior Staff Systems Administrator - System LSI Group
Toshiba America Electronic Components, Inc. -
http://www.toshiba.com/taec
john.stoffel AT taec.toshiba DOT com - 508-486-1087
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