Tiered storage is the assignment of different categories of data to different types of storage media in order to reduce total storage cost. Virtual Private Cloud OnDemand offers two storage tiers for virtual machines.

Standard Storage

Standard storage provides traditional block storage for virtual machines. Standard storage is lower cost and appropriate for storage of tier 2 and tier 3 data. Tier 2 and tier 3 include data that is seldom-used or event driven.

Examples of tier 2 and tier 3 data include large data sets, such as log file storage and archival of large sets of static data.

SSD-Accelerated Storage

SSD-Accelerated storage provides higher performance block storage for virtual machines. SSD-Accelerated storage is appropriate for all tiers (1, 2, and 3); though, it is most recommended for tier 1 data. Tier 1 includes data that is mission-critical, frequently accessed, or requires a high degree of security.

Examples of tier 1 data include a high-access database, which is part of a three-tier application, a host cache, or a virtual machine boot (primary) disk.

Migrating virtual machine disks between tiers has no impact on virtual machine uptime or availability; for example, when moving a virtual machine disk to the other storage tier, the virtual machine can remain powered on and accessible.

You can allocate storage to a virtual machine on a per-disk basis; for example, a virtual machine with two disks could have one disk utilizing SSD-Accelerated storage and the other disk utilizing Standard storage.

Adjusting storage allocation for a virtual machine does not impact existing snapshots for the virtual machine; for example, when expanding disk storage for a virtual machine, you do not need to snapshot the virtual machine before expanding the storage.

Virtual Private Cloud OnDemand lets you direct storage for your virtual machines to either higher performance or lower cost storage tiers.

You can allocate virtual machine storage when creating virtual machines or by adjusting their storage after you create them.

To allocate storage to a specific tier when creating a virtual machine using a template, see Create a Virtual Machine from a Template.

To allocate storage to a specific tier when creating a virtual machine from scratch, see Create a Virtual Machine Without Using a Template.

To add storage from the designated storage tiers to an existing virtual machine, see Add a Disk to a Virtual Machine.