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Dell PowerVault ME4 Series Storage System Administrator’s Guide

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Disk groups in a pool

For better efficiency and performance, use similar disk groups in a pool.
  • Disk count balance: For example, with 20 disks, it is better to have two 8+2 RAID-6 disk groups than one 10+2 RAID-6 disk group and one 6+2 RAID-6 disk group.
  • RAID balance: It is better to have two RAID-5 disk groups than one RAID-5 disk group and one RAID-6 disk group.
  • In terms of the write rate, due to wide striping, tiers and pools are as slow as their slowest disk groups.
  • All disks in a tier should be the same type. For example, use all 10K disks or all 15K disks in the Standard tier.
Create more small disk groups instead of fewer large disk groups.
  • Each disk group has a write queue depth limit of 100. This means that in write-intensive applications this architecture will sustain bigger queue depths within latency requirements.
  • Using smaller disk groups will cost more raw capacity. For less performance-sensitive applications, such as archiving, bigger disk groups are desirable.

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