Hi Dave,

Checking the most recent (September 2014) "Best Practices for Performance guide" only indicates the preference for 4+1, 8+1 and 12+1 groups for RAID 5 and SAS. No mention of 10+1

Specifically from Page 14;

• Use RAID 5 with a preferred drive count of 4+1 for the best performance versus capacity balance
  • Using 8+1 or 12+1 improves capacity utilization at the expense of reduced availability

I remember also reading about 10+1 RAID 5 when OE 2.4.0 was released initially, but I treat the current Best Practice guide as authoritative and would defer to that.

Maybe an EMC'r can comment/clarify further here ?

Hi Dave,

Brett is correct here. The VNXe OE 2.4.0 release, which includes the RAID 5 10+1+HS configuration, is only available for the VNXe3100, VNXe3150, and VNXe3300 models. The VNXe3200 model utilizes the VNXe OE 3.0.0 release (and higher) which includes the RAID 5 4+1, 8+1, and 12+1 configurations for storage pools. The VNXe OE 3.0.0 release (and higher) can only be used on the VNXe3200 model. The VNXe3100, VNXe3150, and VNXe3300 models will continue to leverage VNXe OE 2.4.x releases. The RAID configurations available for the VNXe3200 can be found in the Introduction to the EMC VNXe3200 white paper and the VNXe3200 Best Practices for Performance guide (links provided below).

Links

Introduction to the EMC VNXe3200

VNXe3200 Best Practices for Performance

Good info. Thanks Brett and Charles for responding.

Why different stripe combinations for specific raid types are not possible in VNXe models as against VNX.?

This cause may challenges at customer place during implementation.

What combinations do you think they are lacking ?

Although I think the preferred drive counts are sometimes challenging, these should be addressed during the design phase, not during implementation.