Managing free and allocated storage space

This topic describes how to manage free and allocated space.

Prerequisites

Context

You can use the storage pool usage threshold and the fileset quota and usage threshold to manage the storage space in SAN File System.

The storage pool usage threshold is a percentage of the storage pool's estimated storage capacity. When the amount of used space reaches or exceeds the specified threshold, the metadata server generates an alert.

The fileset quota is the size limit, in megabytes, for the fileset. When the size of the fileset reaches or exceeds the specified limit, the metadata server generates an alert. You can specify either a hard or soft quota. A hard quota denies requests for additional space, and a soft quota grants requests space allocation.

Note: The quota must be set to a whole number.

The fileset usage threshold is a percentage of the fileset's quota. When the amount of used space reaches or exceeds the specified threshold, the metadata server generates an alert.

Steps

  1. Perform the following steps to configure the storage pool threshold:
    1. Click Manage Storage→Pools from the My Work frame.
    2. Select a storage pool.
    3. Click Properties from the drop-down box in the table header.
    4. Click Go.
    5. Click the General Settings tab.
    6. Verify that the Enable usage alerts check box is selected.
    7. Type a percentage in the Usage Threshold field.
    8. Click OK to save the new settings.
  2. Perform the following steps to configure the fileset quota:
    1. Click Manage Filing→Filesets from the My Work frame.
    2. Select a fileset.
    3. Click Properties from the drop-down box in the table header.
    4. Click Go.
    5. Click on the General Settings tab.
    6. Specify the type of quote by selecting either a hard or soft quota in the Quota Type drop-down list.
    7. Type a size limit in the Quota Size field.
      Note: If a hard quota already exists, you must not set the new size to a value less than the current quota size for this fileset.
    8. Verify that the Enable usage alerts check box is selected.
    9. Type a percentage in the Usage Threshold field.
    10. Click OK to save the new settings.

Parent topic: Managing volumes and LUNs

Related concepts
Filesets
Storage pools

Related tasks
Changing fileset settings
Changing storage pool settings
Viewing storage pool details

Related reference
Fileset Properties – General Settings panel
Storage Pool Properties – General Settings panel
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IBM TotalStorage SAN File System v2.2