Article: Last Published: Ratings: 0 1. Product s : NetBackup. Problem Overview: How to calculate the compression ratio for Netbackup job which has compression enabled. Details: To check compressed ratio for a backup job which has compression enabled. Solution Check if the bpbkar log directory is created if not create it. See About the backup and restore of compressed files on VxFS file systems. Compression reduces the size of a backup by reducing the size of files in the backup. In turn, the smaller backup size decreases the number of media that is required for storage.
Compression also decreases the amount of data that travels over the network as well as the network load. However, compression increases the overhead computing on the client and increases backup time due to the time required to compress the files.
The lower transfer rate that is associated with compression on the client reduces the ability of some tape devices notably 8mm to stream data.
The effect of the lower transfer rate causes additional wear on those devices. The savings in media and network resources continue to make compression desirable unless total backup time or client computing resources become a problem. If total backup time is a problem, consider multiplexing. The NetBackup multiplexing feature backs up clients in parallel, reducing the total time to back them up. Specifies that a backup aborts if it fails for a snapshot-related issue after the snapshot is created and while the backup uses the snapshot to back up open or active files on the file system.
The most common reason for a problem after the snapshot is created and is in use by a backup, is that the cache storage is full. If the Abort backup on error property is checked default , the backup job aborts with a snapshot error status if the backup detects a snapshot issue.
This property does not apply to successful snapshot creation. The backup job continues regardless of whether a snapshot was successfully created for the backup job. The Abort backup on error property applies only to the snapshot errors that occur after the snapshot is successfully created and is in use by a backup job.
Specifies that if the snapshot becomes invalid during a backup, the volume snapshots for the backup are destroyed. The backup continues with Windows open file backups disabled. Regarding the file that had a problem during a backup - it may be that the file was not backed up by the backup job. The file may not be able to be restored.
Volume snapshots typically become invalid during the course of a backup because insufficient cache storage was allocated for the volume snapshot. Reconfigure the cache storage configuration of the Windows Open File Backup snapshot provider to a configuration that best suits your client's installation.
Last Published: Product s : NetBackup 8. Section I. You may also refer to the English Version of this knowledge base article for up-to-date information. Support Knowledge base Article: Last Published: Ratings: 6 2. Product s : NetBackup. Solution For this to work, a backup host must be selected. There are other instances where a different host may be ideal: The media server does not have a fast connection to the share but another client does.
In this situation, the fast connection between the client and share can be used to access the data for backup. If the connection from client and media server is slow consider sending less data across that connection by using methods like client side compression or deduplication.
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