Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 76)

Inactive period — Prior to starting a persistent image, the system waits for a period of relative inactivity on
the volume being imaged. The default value for this period, which is 5 seconds, allows systems to start an image
with a consistent file set and a minimal time-out. Experienced administrators may reduce or increase this value
for system optimization. Reducing the inactive period allows persistent images to begin on systems where disk
inactivity is rare, at the possible expense of synchronization problems within applications that are concurrently
writing to multiple files.
Inactive time-out — Specifies the amount of time the system continues to retry to create a persistent image
(default time is 15 minutes). A persistent image cannot start until a period of relative inactivity, specified by
Inactive period, occurs. If an interval longer than Inactive time-out passes before the persistent image can
begin, the persistent image cannot be taken and an error is displayed in the NAS Manager status indicator and
logged in the event log.
Image directory — Specifies the directory name that is to be used for the persistent image mount point. Each
persistent image appears as a subdirectory in the volume that is being imaged. The entire content of the volume,
as it existed when the persistent image was created, appears under this directory.
6. If you need to reestablish the system defaults, click Restore Defaults.
7. Click OK to update the global settings.
Configuring Persistent Image Volume Settings
You can modify volume settings by performing the following steps:
1. Log in to the NAS Manager.
2. Click Disks.
3. Click ActiveArchive.
4. Click Volume Settings.
5. Select the volume that you want to reconfigure.
6. Click Configure.
7. Use the appropriate menus to configure the following options.
NOTE: Before changing the cache size, you must delete all persistent images on that volume.
Warning threshold reached when — Defines the percentage of cache space used that triggers warning
messages to the system event log.
Begin deleting images when — Defines the percentage of cache space used that triggers automatic deletion of
the oldest persistent images with the lowest retention weight on the system. Automatic persistent image
deletions are recorded in the system log.
Cache size — Specifies the percentage of the volume that is allocated to the cache file. Increasing this value
allows more and larger persistent images to be maintained. Ensure that adequate space is available on the
persistent image files' location drive.
8. If you need to reestablish the system defaults, click Restore Defaults.
9. Click OK.
Using Persistent Images