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on 01-04-2010 11:10 AM
1.0 Introduction
The move towards disk based data protection solutions is the single greatest market trend in data protection today. Disk based data protection solutions improve data protection performance, reliability, and disaster recovery capabilities. They lower cost, decrease backup windows, increase flexibility, and provide unique protection capabilities when combined with existing software technologies such as volume management and replication.
NetBackup has supported simple disk based data protection using disk Storage Units and VTLs for several releases but with the release of NetBackup 6.5 several new and enhanced disk-based features were introduced, including the following:
There are six different types of disk storage devices supported by NetBackup 6.5; including two disk types that together form the Flexible Disk Option.
Disk types available prior to the 6.5 release:
1.1 Glossary
The following descriptive terms are used throughout this document:
Disk based data protection – the process by which backups are written to, and stored on, disk based data storage rather than tape media as is common in traditional backup models.
Storage Unit – a logical target to which NetBackup writes backup data. Storage Units may map to either disk or tape storage. The precise nature of the mapping depends on the type of Storage Unit.
Storage Unit Group – a collection of Storage Units that are addressed as a single entity by backup and duplication jobs. Individual Storage Units within the Storage Unit Group that are used for particular operations depend of the rules associated with the Storage Unit Group.
Disk pool – a collection of disk volumes that are presented as a single pool of storage that can be used by one or more Storage Units
SharedDisk disk pool – collection of disk volumes assembled in a disk pool that can be accessed by multiple Media Servers. A SharedDisk disk pool usually resides on a single disk array and the disks within the disk pool can be presented to any of the Media Servers sharing it.
Flexible Disk Option – comprises the AdvancedDisk and SharedDisk disk types, which make use of directly presented disk storage (e.g. a volume on a NAS device or SAN device available to NetBackup). . When licensing either AdvancedDisk or SharedDisk the same, Flexible Disk Option, license is used.
Intelligent storage appliance – a device that provides dedicated, intelligently managed storage that is more than just as simple disk array. In this paper the term ‘storage appliance’ is applied to intelligent devices that store backup data.
Deduplication – the process of eliminating redundant data stored for backup and recovery purposes. Deduplication generally involves breaking down the data into segments, recording the segments for tracking purposes and writing unique segments to storage. Deduplication may take place during the initial write or during post-processing, depending on the device.
Deduplicating device/appliance – a storage device in which data is broken down into segments and only one copy of each segment is stored, irrespective of how many files contain that segment. Deduplicating devices offer significant space savings over conventional disk storage but can have slower transfer rates than conventional disk.
Storage Lifecycle Policy – a mechanism which controls the creation and retention of multiple copies of the same backup data providing a plan or map of where backup data will be stored and for how long.
RPO (recovery point objective) – a service level figure defining the maximum allowable time, prior to a failure, to which an application must be recovered. For example, a recovery point objective of 24 hours means recovered data should no more than 24 hours older than the data at the time of failure. Actual recovery points may differ from established objectives.
RTO (recovery time objective) – a service level figure defining the maximum time allowed to recover an application, server or series of application or servers following a failure. Again it should be noted that the actual recovery time may differ from any established objective. Proper planning and testing needs to be carried out in order to assure that the actual recovery time aligns with the desired recovery time objective.
To read the complete article, please download the PDF.
The move towards disk based data protection solutions is the single greatest market trend in data protection today. Disk based data protection solutions improve data protection performance, reliability, and disaster recovery capabilities. They lower cost, decrease backup windows, increase flexibility, and provide unique protection capabilities when combined with existing software technologies such as volume management and replication.
NetBackup has supported simple disk based data protection using disk Storage Units and VTLs for several releases but with the release of NetBackup 6.5 several new and enhanced disk-based features were introduced, including the following:
- Intelligent disk management capabilities to enable more efficient use of server and storage resources.
- Load balancing across multiple NetBackup Media Servers to improve overall backup performance
- Pre-allocation of disk space to prevent backup failure due to lack of disk space.
- Deduplication features to eliminate redundant data from backup storage.
- Integration with intelligent disk based appliances from leading vendors to allow the user to get optimal value from these solutions.
- Support for ‘off host’ duplication with VTLs to provide tracking within NetBackup for backup duplication carried out within the VTL.
There are six different types of disk storage devices supported by NetBackup 6.5; including two disk types that together form the Flexible Disk Option.
Disk types available prior to the 6.5 release:
- BasicDisk – simple backup to a directory path on a single disk volume with the option of ‘first in first out’ staging to tape.
- Virtual Tape Library (VTL) – a disk storage device that uses a software layer to emulate a tape library. VTLs are an increasingly popular replacement for physical tape libraries as they offer simplified management and reduced operational costs.
- Flexible Disk Option:
o AdvancedDisk – multiple disk volumes presented as a single storage pool on a Media Server providing dynamic storage allocation.
o SharedDisk – array based disk volumes presented as a storage pool to multiple Media Servers to provide high performance, load balanced, fault tolerant backup storage. - PureDisk Deduplication Option – de-duplicated disk storage leveraging commodity disk.
- OpenStorage Option – API level integration with 3 party intelligent disk storage appliances.
1.1 Glossary
The following descriptive terms are used throughout this document:
Disk based data protection – the process by which backups are written to, and stored on, disk based data storage rather than tape media as is common in traditional backup models.
Storage Unit – a logical target to which NetBackup writes backup data. Storage Units may map to either disk or tape storage. The precise nature of the mapping depends on the type of Storage Unit.
Storage Unit Group – a collection of Storage Units that are addressed as a single entity by backup and duplication jobs. Individual Storage Units within the Storage Unit Group that are used for particular operations depend of the rules associated with the Storage Unit Group.
Disk pool – a collection of disk volumes that are presented as a single pool of storage that can be used by one or more Storage Units
SharedDisk disk pool – collection of disk volumes assembled in a disk pool that can be accessed by multiple Media Servers. A SharedDisk disk pool usually resides on a single disk array and the disks within the disk pool can be presented to any of the Media Servers sharing it.
Flexible Disk Option – comprises the AdvancedDisk and SharedDisk disk types, which make use of directly presented disk storage (e.g. a volume on a NAS device or SAN device available to NetBackup). . When licensing either AdvancedDisk or SharedDisk the same, Flexible Disk Option, license is used.
Intelligent storage appliance – a device that provides dedicated, intelligently managed storage that is more than just as simple disk array. In this paper the term ‘storage appliance’ is applied to intelligent devices that store backup data.
Deduplication – the process of eliminating redundant data stored for backup and recovery purposes. Deduplication generally involves breaking down the data into segments, recording the segments for tracking purposes and writing unique segments to storage. Deduplication may take place during the initial write or during post-processing, depending on the device.
Deduplicating device/appliance – a storage device in which data is broken down into segments and only one copy of each segment is stored, irrespective of how many files contain that segment. Deduplicating devices offer significant space savings over conventional disk storage but can have slower transfer rates than conventional disk.
Storage Lifecycle Policy – a mechanism which controls the creation and retention of multiple copies of the same backup data providing a plan or map of where backup data will be stored and for how long.
RPO (recovery point objective) – a service level figure defining the maximum allowable time, prior to a failure, to which an application must be recovered. For example, a recovery point objective of 24 hours means recovered data should no more than 24 hours older than the data at the time of failure. Actual recovery points may differ from established objectives.
RTO (recovery time objective) – a service level figure defining the maximum time allowed to recover an application, server or series of application or servers following a failure. Again it should be noted that the actual recovery time may differ from any established objective. Proper planning and testing needs to be carried out in order to assure that the actual recovery time aligns with the desired recovery time objective.
To read the complete article, please download the PDF.
