Hi Vaugh,

<< In order to replicate de-duplicated data one will require A-SIS licenses on both the sopurce and destination FAS systems. VSM replication is my personal preference.

...

Does this mean that the amount of replicated data is also reduced when you SM a A-SIS source volume to a filer running A-SIS as well? I hope that you mean this, because that would be great ;-)

Roger

-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of M. Vaughn Stewart Sent: za 28 jul 07 1:13 To: Peter W. Osel Cc: toasters@mathworks.com Subject: Re: A-SIS (NetApp De-Duplication)

Peter,

Hello and how are you my friend?

The enabling of the Nearstore personality does not reduce the performance of a system as long as your maintain the number of replication streams (SnapMirror / SnapVault) to the non Nearstore limits

for that platform. You can reference NOW for the limits.

In order to replicate de-duplicated data one will require A-SIS licenses on both the sopurce and destination FAS systems. VSM replication is my personal preference.

Vaughn

Peter W. Osel wrote:

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/