Resizing a File System

If you need to extend or shrink a VxFS file system, you can use the fsadm command.

If a VxFS file system requires more space, you can use this procedure to extend the size of the file system. If a VxFS File System is too large and you need the space elsewhere, you can use this procedure to shrink the file system.

Prerequisites

• This task requires a mounted file system.
• You must know either the desired size or the amount of space to add to or subtract from the file system size.

Usage Notes

• See the fsadm_vxfs(1M) manual pages for more details.

  To resize a file system using the command line

Use fsadm command as follows:

where:

• newsize is the size (in sectors) to which the file system will increase or shrink
• rawdev specifies the name of the raw device if there is no entry in /etc/fstab and fsadm cannot determine the raw device
• /mount_point is the location where the file system is mounted

Example

To extend the file system /db01 to 2 GB:

Resizing a File System and the Underlying Volume

The vxresize command offers the advantage of automatically resizing certain types of file systems as well as the underlying volume.

Prerequisites

• You must know the new desired size of the file system.
• In some situations, you must first unmount the file system before resizing it. The following table shows which operations are permitted and whether the file system must first be unmounted before resizing it:

  	Online JFS (Full VxFS)	Base JFS (Lite VxFS)	HFS
  Mounted File System	Grow and shrink	Not allowed	Not allowed
  Unmounted File System	Grow only	Grow only	Grow only

Usage Notes

• vxresize works with VxFS, JFS (derived from VxFS), and HFS file systems only.
• When resizing large volumes, vxresize may take a long time to complete.
• Resizing a volume with a usage type other than FSGEN or RAID5 can result in data loss. If such an operation is required, use the -f option to forcibly resize such a volume.
• You cannot resize a volume that contains plexes with different layout types.
• See the vxresize(1M) manual page for more details.

Example

To extend a 1-gigabyte volume, homevol, that contains a VxFS file system, to 10 gigabytes, enter:

The -b option specifies that this operation runs in the background. Its progress can be monitored by specifying the task tag homevolresize to the vxtask command.

Growing a File System Automatically Using VxDBA Monitoring Agent

You can use the VxDBA Monitoring Agent to monitor file system space, and when the space usage reaches a configured threshold value, a predefined action script automatically grows the file system. See Managing File System Space for more information.