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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