Drives for Storage Spaces Direct
In deployments with multiple types of drives, it is configured automatically to use all drives of the “fastest” type.
- NVMe (Non-Volatile Memory Express) refers to solid-state drives that sit directly on the PCIe bus.
- SSD refers to solid-state drives, which connect via conventional SATA or SAS.
- HDD refers to rotational, magnetic hard disk drives, which offer vast storage capacity.
- Option 1 – Maximizing performance-“all-flash”
- All NVMe.
- NVMe + SSD
- All SSD
- Option 2 – Balancing performance and capacity
- NVMe + HDD.
- SSD + HDD.
- NVMe + SSD + HDD
- Option 3 – Maximizing capacity
- SSD + HDD
cache drives:capacity drives
The binding between cache and capacity drives can have any ratio, from 1:1 up to 1:12
- For deployments with HDDs, a fair starting place is 10% of capacity
- For deployments with SSDs, a fair starting place is 5% of capacity
- The more storage capacity per server, the longer the time required to resync data after downtime or rebooting, such when applying software updates.