Glossary

A

Agent

The WekaIO agent is software installed on user application servers that need access to the WekaIO file services. When using the Stateless Client feature, the agent is responsible for ensuring that the correct client software version is installed (depending on the cluster version) and that the client connects to the correct cluster.

B

Backend Host

A host that runs the WekaIO software and can also be installed with SSD drives dedicated to the WekaIO system, providing services to client hosts.

C

Client

The WekaIO client is software installed on user application servers that need access to the WekaIO file services. The WekaIO client implements a kernel-based filesystem driver and the logic and networking stack to connect to the WekaIO backend hosts and be part of a cluster.

Cluster

A collection of WekaIO backends, together with WekaIO clients installed on the application servers, forming one sharable, distributed and scalable file storage system.

D

Data Retention Period

The target period of time to maintain data on an SSD, before tiering to an object store.

Data Stripe Width

The number of data blocks in each logical data protection group.

Dedicated WekaIO Deployment

Basic WekaIO configuration involving the creation of a cluster by dedicating complete servers to WekaIO backends, as opposed to converged deployment.

F

Failure Domain

A collection of hardware components that can fail together due to a single root cause.

Filesystem Group

A collection of filesystems which share a common connectivity to an object store system.

H

Hot Data

Frequently-used data (as opposed to warm data), usually residing on SSDs.

Converged Deployment

The configuration of WekaIO backends running on the same host with other applications.

N

Net Capacity

Amount of space available for user data on SSDs in a configured WekaIO system.

P

Provisioned Capacity

The total capacity assigned to filesystems. This includes both SSD and object store capacity.

Prefetch

The WekaIO process of rehydrating data from an object store to an SSD, based on a prediction of future data access.

R

Raw Capacity

Total SSD capacity owned by the user.

Retention Period

Target time for data to be stored on SSDs before release from the SSDs to an object store.

Releasing

The deletion of the SSD copy of data which has been tiered to the object store.

Rehydrating

The creation of an SSD copy of data stored on object store only.

S

Stem Mode

A mode of the WekaIO software which has been installed and is running, but has not been attached to a cluster.

Snap-To-Object

A WekaIO feature for uploading snapshots to object stores.

T

Tiered WekaIO Configuration

WekaIO configuration consisting of SSDs and object stores for data storage.

Tiering

Copying of data to an object store, while it still remains on the SSD.

Tiering Cue

The minimum time to wait before considering data for tiering from an SSD to an object store.

U

Unprovisioned Capacity

The storage capacity available for new filesystems.

V

VF

Virtual Function

W

Warm Data

Less frequently-used data (as opposed to hot data), usually residing on an object store.