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IOPS Estimation for EMC VNX-F7000

Written on:April 1, 2015
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In this article, we estimate the performance of the new Flash storage system EMC VNX-F7000 for different workload profiles, as well as other parameters of IOPS per GHz, IOPS per GB.

All the performed calculations are based on the methodology described in the article «Methodology of IOPS Estimation».

Let’s gather all necessary information needed to a calculation.

  • The frequency of processor cores – 2,2 GHz.
  • The number of cores on the one controller – 8.
  • The sum frequency calculation – 8 x 2,2 GHz = 17,6 GHz.
  • At this stage we can get a rough estimation of the IOPS for one controller. To do this, it is necessary to use the relation between the number of IOPS and sum frequency of the controller. This value is specified in the methodology (10000 IOPS / GHz). Let’s multiply 17,6 GHz x 10000 IOPS / GHz, we obtain a rough estimation 176000 IOPS per controller. Thus, the performance of a pair of controllers is equal to 352000 IOPS. We can use these rough estimates for self-examination.
  • We take information about recommended configurations of RAID groups in the «EMC All-Flash systems VNX-F5000, VNX-F7000: a Brief Overview»:
    • RAID 5 SSD are used in the configuration 8+1.
  • Max disk drive quantity for the VNX7600 is 1000.
  • Max 1,6TB data disk drive quantity for the VNX-F7000 is 135 (15 Raid Groups per 9 drives).
  • 4 drives are used for OS and minimum 5 drives for hotspare.

Now we have all necessary information for our calculations.

The estimation for max IOPS (Cache Read Miss)

Let’s set the basic values for the estimation:

  • Read operations – 99%.
  • The configuration for MLC drives – RAID5 8+1.
  • The quantity of groups – 15.

As a result we got such results:

05262015_VNX_F7000_IOPS_R99

The graphic representation results of calculation:

05262015_VNX_F7000_IOPS_R99_graph

Total:

Max IOPS is 472330.
Max IOPS for one controller is 236165.
The ratio IOPS/GHz is 13419.
The ratio IOPS/GB is 2,687.

Real Flash storage capacity is about 172 TB.

Let’s compare this result with a rough estimation, which we did in the beginning of this article. Then we got 176000 IOPS for one controller. The difference with the new result is about 26%.

The IOPS estimation for DB like workload (Cache Read Miss)

Initial parameters are the same, but the percentage of read operations is different. Typical ratio between read and write operations is equal to 70/30 for databases (OLTP workload).

05262015_VNX_F7000_IOPS_R70

The graphic representation results of calculation:

05262015_VNX_F7000_IOPS_R99_graph

Total:

Max IOPS (DB like) – 256053.
Max IOPS for one controller (DB like) is about 128027.
The ratio IOPS per GHz is about 7274.
The ratio IOPS per GB is 1,456.

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