# Manage filesystem groups

A filesystem group defines the policy of the drive retention period and the tiering cue time. The Weka system can include up to eight filesystem groups.

**Related topics**

[filesystems](https://docs.weka.io/4.0/overview/filesystems "mention")

[managing-filesystem-groups](https://docs.weka.io/4.0/fs/managing-filesystem-groups/managing-filesystem-groups "mention")

[manage-filesystem-groups-using-the-cli](https://docs.weka.io/4.0/fs/managing-filesystem-groups/manage-filesystem-groups-using-the-cli "mention")