Settings Management

 

Select the Settings tab to access Server Management parameters for tuning the file system as well as determining the behavior of the software under certain conditions. Within this screen are the following parameters:

 

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Replace Empty Files - controls whether or not zero-length files stored on storage media are replaced when you attempt to create a file by the same name. Checking this option treats a zero-length file as if it doesnít exist, and allows a new file of the same name to be created.

 

      Default = No

 

Retry Optical Errors - determines whether or not errors returned from the storage device drivers are retried during write requests.

 

Premount All Disks - This setting indicates whether the InveStore file system should verify the presence and location of each volume within each library during startup.

 

The process ensures that all of the media that is being tracked by the InveStore Storage Management file system at the time of the last shut down are indeed present at the next restart.

 

This pro tects the system from unexpected problems due to media that may have been moved or removed via library front panel con trols while the server system was down.

 

The default selection of YES will cause the PREMOUNT to occur. Selecting NO will prevent InveStore from making this system check, thereby speeding up the startup time of the system.

 

Note: If the production site is experiencing problems or if a normal shutdown of InveStore does not occur, re-enable the Pre-mount option and restart the system. Under these circumstances, if a proper library inventory is not performed, problems accessing the storage media may result.

 

To re-enable the Premount All Disks option, use the Windows Start Menu, Programs, and then the Pegasus InveStore folder and select the PDTEDIT program. Use this configuration program to make sure the PREMOUNT ALL option is enabled. Select Apply and Exit.

 

Mount Validation- Enabling this option causes the system to validate each file while mounting. Enable this feature when you have damaged media.

 

Note: Enabling this feature will degrade performance during mounting.

 

Delete Files - indicates whether or not to allow file deletions on your storage media.

 

File System

 

Number of Threads- the maximum number of threads available to the worker thread pool. This setting determines how many requests can be processed concurrently. Adding more threads can improve system performance but uses additional memory and resources. Too many threads therefore can have a reverse effect on performance if the server does not have the necessary resources available.

 

Number of Overlaps - the maximum number of I/O requests that can be queued if all of the threads defined by the Number of Threads setting are in use. If the queue becomes exhausted, incoming requests are rejected. Increasing this setting allows more requests to be queued at the cost of consuming memory and resources.

 

VIM

 

Number of Threads- the maximum number of threads available to the VIM API thread pool. Each process that uses the VIM API receives its own pool of threads. This setting determines how many requests can be processed concurrently. Adding more threads can improve system performance but uses additional memory and resources.

 

Too many threads therefore can have a reverse effect on performance if the server does not have the necessary resources available.

 

Number of Overlap - the maximum number of VIM API requests that can be queued if all of the threads defined by the Number of Threads setting are in use. If the queue becomes exhausted, incoming requests are rejected. Increasing this setting allows more requests to be queued at the cost of consuming memory and resources.

 

Debug SCSI I/O - used for debugging hardware and SCSI related problems. All SCSI command descriptor blocks that are sent to a device are recorded in a file:

 

[Serverís name][DATE]SCSIDEBUG.LOG

 

Errors received are recorded using full sense data output.

 

Note: This should be selected ONLY when requested by Pegasus Technical Sup port.