NetBackup nbdevconfig command options for AdvancedDisk disk pools — NetBackup 8.2 | Cohesity Documentation

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NetBackup nbdevconfig command options for AdvancedDisk disk pools — NetBackup 8.2 | Cohesity Documentation

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NetBackup nbdevconfig command options for AdvancedDisk disk pools

Table: nbdevconfig command options for AdvancedDisk disk pools shows the options that you can use when you use the nbdevconfig command to configure an AdvancedDisk disk pool

Table: nbdevconfig command options for AdvancedDisk disk pools

Option	Description
-comment comment	A comment that is associated with the disk pool.
-dp disk_pool_name	The name of the disk pool. Use the same name that you used when you configured the disk volumes.
-dvlist filename	The name of the file that contains the information about the volumes for the disk pool.
-hwm high_watermark	The *high_watermark* setting is a threshold that triggers the following actions: When an individual volume in the disk pool reaches the *high_watermark, NetBackup considers the volume full. NetBackup chooses a different volume in the disk pool to write backup images to. When all volumes in the disk pool reach the high_watermark, the disk pool is considered full. NetBackup fails any backup jobs that are assigned to a storage unit in which the disk pool is full. NetBackup also does not assign new jobs to a storage unit in which the disk pool is full. NetBackup begins image cleanup when a volume reaches the high_watermark; image cleanup expires the images that are no longer valid. For a disk pool that is full, NetBackup again assigns jobs to the storage unit when image cleanup reduces any disk volume's capacity to less than the high_watermark*. If the storage unit for the disk pool is in a capacity-managed storage lifecycle policy, other factors affect image cleanup. The default is 98%.
-lwm low_watermark	The Low water mark is a threshold at which NetBackup stops image cleanup. The Low water mark setting cannot be greater than or equal to the High water mark setting. The default is 80%.
-M master_server	The name of the master server.
-max_io_streams n	Select this option to limit the number of read and write streams (that is, jobs) for each volume in the disk pool. A job may read backup images or write backup images. By default, there is no limit. When the limit is reached, NetBackup chooses another volume, if available. If not available, NetBackup queues jobs until a volume is available. Too many jobs that read and write data may degrade disk performance because of disk thrashing. (Disk thrashing is when the read and write heads move between the cylinders excessively as they seek the data for competing jobs.) Fewer streams may improve throughput, which may increase the number of jobs that complete in a specific time period. A starting point is to divide the Maximum concurrent jobs of all of the storage units by the number of volumes in the disk pool.
*-reason "string"*	The reason that you create the disk pool.
-storage_servers hostname	The name of each storage server that has a file system mount on the storage. Specify all NetBackup media servers that are storage servers for this disk pool.
-stype server_type	For AdvancedDisk with encryption, use `AdvancedDisk_crypt`, otherwise use `AdvancedDisk`.

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