ADSM-L

Re: [ADSM-L] DataDomain VTL

2010-01-12 12:58:36
Subject: Re: [ADSM-L] DataDomain VTL
From: Howard Coles <Howard.Coles AT ARDENTHEALTH DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 12 Jan 2010 11:56:48 -0600
Performance mainly, having to turn off DirectIO to do NFS to volumes,
and Security.


See Ya'
Howard Coles Jr.
John 3:16!


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Andrew Carlson
Sent: Tuesday, January 12, 2010 9:36 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] DataDomain VTL

Could you share those reasons?  I would be interested because we tested
one,
and the NFS seemed to work great.  Thanks.

On Tue, Jan 12, 2010 at 9:04 AM, Howard Coles
<Howard.Coles AT ardenthealth DOT com
> wrote:

> Thanks.  I don't want to do the NFS stuff with TSM for a few reasons,
> but this helps.
>
>
> See Ya'
> Howard Coles Jr.
> John 3:16!
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
Of
> Strand, Neil B.
> Sent: Tuesday, January 12, 2010 8:55 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: [ADSM-L] DataDomain VTL
>
> Howard,
>   I have a pair of DDR410s and pair of DDR510's that are configured
for
> NFS.  The 510's are being used to store vRanger backups of a VM
> environment. Compression/deduplication is incredible for this
> application.  47TB(terabytes) are stored on 811GB (Gigabytes).  Now
> realize that there is a lot of redundancy with VMs and this
environment
> does not experience a lot of change, but the ability to store 30+ days
> worth of full backups of 30 or 40 VMs on less than a TB or storage,
> approaches the cost of tape (excluding electricity).  The 510 and 410
> models are out of date and I have not messed with the VTL
configuration
> so cannot speak to that specific feature.
>
>   Configuration is relatively simple.  Performance is nothing to brag
> about for these models (except the deduplication/compression), The one
> drawback is that a couple of filesystem reconfiguration tasks require
> taking the filesystem offline.  The systems have been running for
> several years with only an occasional disk replacement.  OS upgrades
are
> relatively straightforward - outage required.
>
>   I did some testing with TSM using an NFS mount.  TSM was configured
> to use the NFS mount with FILE device class with 2GB files.  My
> intention was to compare DDR deduplication with TSM deduplication.  I
> never got back to testing TSM deduplication but the DDR deduplication
> was 281GB stored on 58GB = 80% savings.  Now this data was from a
> handfull of windows workstations, so there was a lot or redundancy in
> the data.
>
>   Generally, I found the DDRs simple to set up, reliable,
maintainable,
> and do what they are supposed to do - crush bits together into the
> smallest possible space. Performance is good - just don't expect a
> screaming fast system - at the low end.  The high end systems and
newer
> systems advertise greater performance.
>
> Cheers,
> Neil Strand
> Storage Engineer - Legg Mason
> Baltimore, MD.
> (410) 580-7491
> Whatever you can do or believe you can, begin it.
> Boldness has genius, power and magic.
>
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
Of
> Howard Coles
> Sent: Monday, January 11, 2010 4:58 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: [ADSM-L] DataDomain VTL
>
> Is anyone out there using a DataDomain VTL?  I'm getting some pressure
> to look at this, and I'd like to find some honest opinions of them.  I
> know that some time back there were some conversations around this,
but
> some tech has been updated and DD has been bought by EMC, etc.  So, if
> you have one, and would like to share your opinion I'd appreciate it.
>
>
>
> See Ya'
>
> Howard Coles Jr.
>
> Sr. Systems Engineer
>
> (615) 296-3416
>
> John 3:16!
>
>
>
>
>
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--
Andy Carlson
------------------------------------------------------------------------
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