You can create volumes using either a disk pool or a volume group. The best selection depends primarily on your key storage requirements, such as expected I/O workload, performance requirements, and data protection requirements.
If you have a highly sequential workload and need maximum system bandwidth and the ability to tune storage settings, choose a volume group.
If you have a highly random workload and need faster drive rebuilds, simplified storage administration, and thin provisioning, choose a Dynamic Disk Pool (DDP).
After you have made your decision, go to either Creating a disk pool or Creating a volume group to continue.
Use Case | Volume Group | Dynamic Disk Pool |
---|---|---|
Workload - random | Good | Better |
Workload - sequential | Better | Good |
Drive rebuild times | Slower | Faster |
Performance (optimal mode) | Good Best for large-block, sequential workloads |
Good Best for small-block, random workloads |
Performance (drive rebuild mode) | Degraded. Up to 40% drop in performance |
Better |
Multiple drive failure | Less data protection Slow rebuilds, greater risk of data loss |
Greater data protection Faster, prioritized rebuilds |
Adding drives | Slower Requires Dynamic Capacity Expansion operation |
Faster Add to disk pool on the fly |
Thin provisioning support | No | Yes |
SSDs | Yes | Yes |
Simplified administration | No Allocate global hot spares, configure RAID |
Yes No hot spare or RAID settings to configure |
Tunable performance | Yes | No |