Keep storage tiers » History » Revision 2
Revision 1 (Tom Clegg, 04/27/2017 08:02 PM) → Revision 2/13 (Tom Clegg, 04/28/2017 12:46 AM)
h1. Keep storage tiers Typically, an Arvados cluster has access to multiple several classes of storage devices with different cost/performance trade-offs. Examples: * Local SSD * Local HDD * Object storage service provided by cloud vendor * Slower or less reliable object storage service provided by same cloud vendor Users should be able to specify a minimum storage tier for each collection. Arvados should ensure that every data block referenced by a collection is stored at the specified tier _or better_. The cluster administrator should be able to specify a default tier, and assign a tier number to each storage device. It should be possible to configure multiple storage devices at the same tier: for example, this allows blocks to be distributed more or less uniformly across multiple cloud storage buckets for performance reasons.