HP StorageWorks 4000s NAS 4000s and 9000s Administration Guide - Page 84

Disk Management Scheduling Defragmentation Defragmentation is the process of analyzing local volumes and consolidating fragmented files and folders so that each occupies a single, contiguous space on the volume. This allows the system to access files and folders and save new ones more efficiently. Because defragmentation consolidates files and folders, it also consolidates the free space on a volume. This reduces the likelihood that new files will be fragmented. Defragmentation for a volume can be scheduled to occur automatically at convenient times. Defragmentation can also be done once, or on a recurring basis. To schedule defragmentation for a volume: 1. On the primary navigation bar, choose Disks. 2. Click the Volumes tab. 3. Select the volume to schedule defragmentation. 4. In the Tasks list, choose Schedule Defrag. 5. On the Manage the defragmentation schedule for [VolumeName] page, select the Schedule defragmentation for this volume check box. 6. Select the frequency: Once, Weekly, or Monthly. 7. Use the remaining controls to specify when defragmentation will occur. The available controls change according to the frequency that is selected. 8. Click OK. To disable defragmentation for a volume: 1. On the primary navigation bar, click Disks. 2. Click Volumes. 3. Select the volume to disable defragmentation. 4. In the Tasks list, choose Schedule Defrag. 5. On the Manage the defragmentation schedule for [VolumeName] page, clear the Schedule defragmentation for this volume check box. 6. Click OK. Note: Scheduling defragmentation to run no later than a specific time prevents the defragmentation process from running later than that time. If the defragmentation process is running when the time is reached, the process is stopped. This setting is useful to ensure that the defragmentation process ends before the demand for server access is likely to increase. If defragmenting volumes on which shadow copies are enabled, use a cluster (or allocation unit) size of 16 KB or larger during the format. Otherwise defragmentation registers as a change by the Shadow Copy process. This increase in the number of changes forces Shadow Copy to delete snapshots as the limit for the cache file is reached. Caution: Allocation unit size cannot be altered without reformatting the drive. Data on a reformatted drive cannot be recovered. 84 NAS 4000s and 9000s Administration Guide