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2-116 Sun StorEdge 5310 NAS Troubleshooting Guide • December 2004
the checkpoints. A large amount of space and system memory is required for
checkpoints. The more checkpoints there are on a system, the more it will affect the
system’s performance.
Checkpoints are generated from changed blocks. If system usage consists of large
amount of file changes then the system will base the next checkpoint off of the
changed blocks. It is recommended that when using checkpoints the volume should
be allocated at no more than 70% this would allow for system operation to maintain
maximum performance as well as give space to the system OS. At 90% disk space
utilization, StorEdge will stop creating scheduled checkpoints. At 95% StorEdge will
automatically delete checkpoints to free space for system operations.
Checkpoints can be created in two ways: automatic and manual. If the user selects
the automatic checkpoints, checkpoints are created and removed based on the
scheduling that user specifies for the checkpoints. This scheduling is enforced by a
checkpoint manager thread. On the other hand, checkpoint manager does not control
manually created checkpoints (though users can create manual checkpoints that will
be removed automatically by using the same naming convention that system uses
for automatic checkpoints).
How do I set up checkpoints?
To utilize this StorEdge feature, you must first go to the file volume operations menu
and enable checkpoints. To do so, proceed as follows:
1. Access the StorEdge via Telnet or serial console.
2. Press [Enter] at the [menu] prompt and enter the administrator password.
3. Enter “D”, “Disks & Volumes” in the configuration section to set up checkpoints.
4. Enter the letter corresponding to the system disk that contains volume that
requires checkpoints.
5. Select the number corresponding to the volume that requires checkpoints.
6. Select option “6”, “Checkpoints”.
7. Select option “1”, “Edit fields”.
8. Use [Tab] or [Enter] to navigate through fields.
9. Select option “Y”, “Yes” to enable checkpoints on the selected volume
10. Pseudo volume checkpoint name is forced to “Yes”
11. Select option “Y”, “Yes” to make the checkpoint volume visible.