Hi Peter,

You need the nearstore personality license AND the asis licence.

As I have understand about the nearstore personality: there is no impact in the performance behaviour of your FAS system. But the other parameter that also changes at the same time is the amount of simultaneous snapmirror/snapvault connections. When you do a lot of snapvaults or QSM's this can cause at the end some performance concerns. But you can solve those very easy to play with the schedules or with flexshare.

For snapmirror, I think that you can do it with only asis on the source. But of course, when you want to activate the snapmirrored volume, and you want still have the benefit of asis for new data, you need also asis on the destination. I have no experience with this scenario.

ASIS works great (in my case) for dumps to disks, or archive of our invoices, email archive, office data. Today, I only use it on my R200’s (so I don’t have the problem with the nearstore personality).

The savings varies between 5 and 80%. The only problem is that asis is a batch process. So for dumps, you must play with the schedules (dumping and asis) to have a great result.

I haven't tried the home dirs, but I think this must be perfect for asis.

Greetings,

Reinoud

it-manager infrastructure & operations

UZ Leuven

Belgium

-----Original Message-----
From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Peter W. Osel
Sent: vrijdag 27 juli 2007 23:32
To: toasters@mathworks.com
Subject: A-SIS (NetApp De-Duplication)

Hello *,

we are in the process of consolidating several NetApp filers and

NearStore systems onto a single FAS30x0HA system.  The system's main

function is to serve primary data (part from FCAL disks, part from SATA

disks), it's secondary function is to act as the NearStore system for a

second site, storing the copy of the other site's data on SATA disks.

Now we would like to try A-SIS to reduce the required physical

storage.

It looks as if in order to add A-SIS (a_sis license), I also need to

install the NearStore license.  Now my concern is, that by giving the

system a NearStore personality I might impact the system's primary role

- serving primary storage data to users.

Has anyone experience with how a system changes when the NearStore

licenses is enabled?  Any negative impact for serving data to users?

Is the NearStore personality activated by installing the nearstore

license, or could we install the nearstore and a_sis license, but keep

the nearstore personality deactivated?

For data that we volume SnapMirror, would we need an A-SIS license on

both sides - source and target system?

Will the volume SnapMirror transfer less data (assuming that A-SIS

de-dupe of data saved some of the required data blocks)?

yes?!)

Any other experience (good or bad) or concerns when using A-SIS?

Any reason to not use it on all (home directory type data) volumes?

Any limitation encountered?

Any experience how much savings can be achieved (e.g. for home

directories volumes, volume storing tons of application software

packages)?

Cheers

      --pwo

--

Peter W. Osel                eMail: pwo@Qimonda.COM

Principal Development Systems Phone: +1.919.677.6333

Qimonda North America Corp.  Cell : +1.408.348.6735

3000 CentreGreen Way         eFax : +1.804.952.3905

Cary, NC 27513-5760, USA     www : http://pwo.de/