Do you do any migration of the data to tape? If you are how is that
working?

-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Justin
Piszcz
Sent: Tuesday, April 03, 2007 4:58 AM
To: Tom Burrell
Cc: Veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] DataDomain and Netbackup

Comments are below:

On Mon, 2 Apr 2007, Tom Burrell wrote:

> Where do I start?
>
> What kind of compression do you see?
The compression is really strange, these rates are based upon 100-200GB
of 
actual data from a Windows server, but it only shows up as 30GB or so:

ddr# df -h
Resource              Size GB   Used GB   Avail GB   Use%
-------------------   -------   -------   --------   ----
/ddvar                   29.5       0.8       27.2     3%
Pre-compression             -     448.6          -      -
Data                   3857.6      11.4     3846.1     0%
    If 100% cleaned*    3857.6      11.4     3846.1     0%
Meta-data                19.4       0.0       18.3     0%
Index                   181.5       3.9      177.6     2%
-------------------   -------   -------   --------   ----
Estimated compression factor*: 29.2x = 448.6/(11.4+0.0+3.9)
* Estimate based on 2007/04/03 cleaning
ddr#


>
> How does the performance compare to tape/other disk in
> your environment?
The DDR units we have are older models, they use some sort of
proprietary 
RAID-6 technology so if you run one stream you will see 20-30MB/s but if

you run more than one, well, you will see 5-8MB/s on each stream.

>
> Are you using an appliance, or a gateway unit?  If a
> gateway, what do you have behind it for disk?
I am using an DDR unit for disk backups, it has several disks and cost a

bunch :)

>
> Do you replicate between units?  DR or Remote Office
> backup?
You can, but it won't help with NetBackup catalogs :)

ddr# help replication

NAME
      replication - Manage the Replicator for replication of data from
one
      restorer to another.

SYNOPSIS
      replication add source <hostname> destination <destination>

      replication break <destination>

I currently do not use replication.

>
> How does the replication do on bandwidth?
I believe it only rsyncs the blocks that have changed every 5 minutes if
I 
remember correctly(?)

>
> How has the support experience been for you?  How is
> the reliability in your opinion?
We do not POUND the DDR units to the ground; but, overall they are nice
to 
have to use as DSU's to backup hosts with many files or slow links, that

way it saves our tapes from shoe shining.

Justin.

  >
> That should start you off.  I'll stop and take a
> breath now.
>
> Tom Burrell
>
> --- Justin Piszcz <jpiszcz at lucidpixels.com> wrote:
>
>> I use DDR units on a daily basis and have tested
>> their VTL option, what
>> are your questions?
>>
>> On Mon, 2 Apr 2007, Tom Burrell wrote:
>>
>>> Anyone out there have some experiences they would
>> like
>>> to share using DataDomain appliances as Disk
>>> Storage/Staging units behind Netbackup?  Esp. in a
>> DR
>>> scenario (replicating between sites)?
>>>
>>> We are considering a number of options, and at
>> least
>>> on paper this one looks pretty interesting and I'm
>>> hearing good anecdotal evidence locally.  Plans
>> are
>>> being formed for a proof-of-concept on this, but I
>> was
>>> wondering if anyone else has tried this route
>>> recently.
>>>
>>> Tom Burrell
>>>
>>>
>>>
>>>
>>
>
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>
>
>
>
>
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