When you install SAN File System, there is a system storage pool, which is used by metadata servers to store system and file metadata, and a default storage pool, which can be used to store file data. You can create additional user storage pools for file data; however, no data can be stored in a storage pool until you assign one or more volumes to it. You can also remove the default storage pool if you choose.
The volumes added to the system storage pool are called system volumes.
As the amount of metadata that is generated for the server cluster and client files grows, you must ensure that the system storage pool always has enough volumes assigned to it so that it does not run out of space.
You must also ensure that any user storage pools, including the default storage pool, has a sufficient number of volumes. Each storage pool must have at least one volume assigned to it before any files can be stored in it.
To assist you in monitoring storage pool capacity, SAN File System provides a threshold option that you can specify when adding a volume to a storage pool or changing settings for a storage pool. A threshold is a specified percentage of the estimated maximum capacity of the storage pool. When a storage pool reaches or exceeds the percentage specified as its threshold, SAN File System generates an alert. This alert can also generate an SNMP trap message to notify you of the condition asynchronously, if you set the appropriate parameters for SNMP traps.
Parent topic: Volumes