Backup Exec 20.2 Administrator's Guide

To edit disk cartridge properties

1. On the Storage tab, double-click the disk cartridge for which you want to edit properties.
2. In the left pane, click Properties.
3. Edit any of the following options:

   Name	Displays the name of the disk cartridge. Disk cartridge names cannot exceed 128 characters. You can rename the disk cartridge.
   Description	Displays a description of the disk cartridge. You can change the description.
   Maximum file size	Displays the maximum file size on the disk cartridge. The data from the job is contained in a file on the disk cartridge. The default value is 50 GB or the capacity of the disk cartridge media.
   Preallocate disk space incrementally up to the maximum file size	Creates the file when the job starts by preallocating space incrementally, according to the size of the increment that you set in Preallocation increment. As the job uses the disk space, more disk space is preallocated up to the maximum file size. When the job completes, the file size is then reduced to the amount of disk space that the job used. For example, if you enable preallocation and set the preallocation increment to 4 GB, then 4 GB of disk space is preallocated when the job starts. After the job uses 4 GB, then Backup Exec allocates another 4 GB. Disk space continues to be preallocated by 4 GB until the job completes. If the job only uses 13 GB of the 16 GB that was allocated, then the file size is reduced to 13 GB. The default value is Disabled.
   Preallocation increment	Displays the amount of disk space by which to increase the file size if the option to preallocate disk space is enabled. The file size increases by this increment as the job requires disk space, up to the maximum file size. The default value is 1 GB.
   Auto detect block and buffer size	Indicates if Backup Exec automatically detects the preferred settings for the block size and buffer size for the disk storage. The default value is Enabled. If you disable this setting, you can then choose the block size and buffer size to use.
   Block size	Displays the size of the blocks of data that are written to new media in this disk cartridge if the option Auto detect block and buffer size is disabled. The default is the preferred block size. Some storage devices provide better performance when larger block sizes are used. The preferred block size can range from 512 bytes to 64 kilobytes or larger. If you use the storage that supports larger block sizes, you can change the block size. However, if the option to change the block size is unavailable, you must configure the device to use a larger size. See the manufacturer's documentation for help in configuring the storage. Backup Exec does not ensure that the storage device supports the requested block size. If the requested block size is not supported, it defaults to its standard block size. If the storage does not support block size configuration, this option is unavailable.
   Buffer size	Displays the amount of the data that is sent to the disk cartridge on each read or write request if the option Auto detect block and buffer size is disabled. The buffer size must be an even multiple of the block size. Depending on the amount of memory in your system, increasing this value may improve storage performance. Each type of storage requires a different buffer size to achieve maximum throughput. If the preferred block size is greater than 64 KB, the default buffer size is the same as the default block size. If the preferred block size is less than 64 KB, then the default buffer size is 64 KB.
   Low disk space - Critical	Displays the disk space threshold at which the color of the capacity bar on the Storage tab turns red to indicate critically low available space. Backup Exec does not send low disk space alerts for disk cartridge devices. You can change the value of the threshold, but it must be less than the warning threshold. The default value is 5%.
   Low disk space - Warning	Displays the disk space threshold at which the color of the capacity bar on the Storage tab turns orange to indicate a low disk space condition. Backup Exec does not send low disk space alerts for disk cartridge devices. You can change the value of the threshold, but it must be less than the low disk space threshold. The default value is 15%. See Storage tab overview in Backup Exec.
   Low disk space	Displays the disk space threshold at which the color of the capacity bar on the Storage tab turns yellow to indicate the first of three low disk space conditions. Backup Exec does not send low disk space alerts for disk cartridge devices. When the disk cartridge media reaches this threshold, the data lifecycle management feature immediately searches this disk cartridge media for expired backup sets that it can delete You can change the value of the threshold. The default value is 25%. See Storage tab overview in Backup Exec.
   Auto detect settings	Indicates if Backup Exec automatically detects the preferred settings for read and write buffers for the disk cartridge. The default value is Enabled.
   Buffered read	Indicates the following when the setting is enabled: You do not want Backup Exec to automatically detect settings for this disk cartridge. You want this disk cartridge to allow buffered read, which is the reading of large blocks of data. Enabling buffered read operations may provide increased performance. The default value is Enabled. If you disable Auto detect settings, this setting also changes to Disabled.
   Buffered write	Indicates the following when the setting is enabled: You do not want Backup Exec to automatically detect settings for this disk cartridge. You want this disk cartridge to allow buffered write, which is the writing of large blocks of data. The default value is Enabled. If you disable Auto detect settings, this setting also changes to Disabled.

4. Click Apply.