RE: EMC DMX & DW

If you mirrored the RAID-S then your overhead is 120/200 = 60% I wouldn't do this, instead would use software striping and get the disks mirrored (hardware or software) = raid 0 + 1.

Regards,

Waleed

-----Original Message-----
From: Powell, Mark D [mailto:mark.powell_at_eds.com] Sent: Friday, February 20, 2004 1:08 PM
To: 'oracle-l_at_freelists.org'
Subject: RE: EMC DMX & DW

The first box we had from EMC we used OS level stripping and mirroring with.

With the last box EMC would only set the box up as RAID-S, the EMC version of RAID-5, and we mirror RAID-S. Considering RAID-S has 25% overhead to the normal 20% overhead of RAID-5 and the fact mirroring is 100% disk storage overhead it actually seems to perform reasonably well at the cost of only a few disk (more money than I have).

Later this year we will be getting a new disk farm. It might be EMC and we will have to see what the vendor support/sales team makes available to us.

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Rich Holland Sent: Friday, February 20, 2004 11:41 AM To: oracle-l_at_freelists.org
Subject: RE: EMC DMX & DW

I'd be really surprised if you couldn't order it (or configure it) as Raid 1 instead. I don't have a DMX here, but typically configure everything as 0+1 (mirrored & striped) for our ERP applications.

Others I've spoken to have fallen in love with the DMX, which supports snapshots; instead of an equal amount of disk to support BCV's, you now only need 10-15% to take an instantaneous "snapshot" of your data.

Rich

--
Rich Holland        (913) 645-1950        SAP Technical Consultant
print unpack("u","92G5S\=\"!A;F]T:&5R(\'!E<FP\@:&%C:V5R\"\@\`\`");



> -----Original Message-----

> From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]

On


> Behalf Of Khedr, Waleed

> Sent: Wednesday, February 11, 2004 12:59 PM

> To: 'oracle-l_at_freelists.org'

> Subject: EMC DMX & DW

> 

> 

> Does anybody have good or bad experience using EMC DMX storage for big

Data


> Warehouse project?

> 

> I was told it's Raid-5 :(

> 

> Thanks

> 

> Waleed

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