[Linux-PowerEdge] DDP and IOPS

Chadley_Hamil at Dell.com Chadley_Hamil at Dell.com
Fri Jun 17 07:48:44 CDT 2016

Dell - Internal Use - Confidential

The link that was provided for the documentation is what we have for DDP, this would apply to all of the MD3 series.

The best way to determine if DDP is a good fit vs traditional RAID, would be to test in the environment, since each environment/workload is different. A factor to take into account is, if the hard drive is larger than 3 TB, it would be highly recommended to move to DDP, due to rebuild times.

Pages 11-12:
Dynamic Given the nature of D-Stripe distribution within a Dynamic Disk Pool, performance is largely going to depend on the frequency of I/O requests to specific disks within the pool. For environments where potential disk contention is not a limiting factor for performance but instead the effective bottleneck is at the controller level for items such as CPU resources and available host-side bandwidth, then very little difference would be expected between a Dynamic Disk Pool and a similarly configured traditional RAID Disk Group(s).

Chadley Hamil
Master Engineer – Team Lead
Dell | Storage Support Services 
Hours: Monday – Friday, 7am – 4pm CST
chadley_hamil at dell.com
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-----Original Message-----
From: linux-poweredge-bounces-Lists On Behalf Of Jose-Marcio Martins da Cruz
Sent: Friday, June 17, 2016 1:50 AM
To: linux-poweredge-Lists <linux-poweredge at lists.us.dell.com>
Cc: Jose-Marcio Martins da Cruz <Jose-Marcio.Martins at mines-paristech.fr>
Subject: [Linux-PowerEdge] DDP and IOPS


I can find many  links on how to estimate the IOPS by kind of RAID, but I haven't found any for DDP on a MD34xx.

I've found a technical paper, which proposes just qualitative feelings :


How to compare DDP IOPS with other kind of RAID ?



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