【 Weak current College 】 hard disk backup and virtual tape library, on the

With the decreasing cost of hard disk, use the hard disk as the backup media trends has become increasingly clear. Hard drive backup is usually divided into two kinds of direct and indirect. Copy the data directly to your hard drive for removal, or that your backup software to backup data BacktoDisk directly written to the hard disk is a rare form of direct backup to a hard disk; with virtual tape library as a backup medium is the usual form of indirect drive backup. The so-called indirect, because virtual tape library to hard drive emulation into physical tape library to implement backup software for virtual tape library maintains a complete data backup to a hard disk.

Some users to mistakenly believe that direct backup to a hard disk is hard disk backup, and the General form of a virtual tape library backup results are equivalent. Let's analyze this difference and that one instance to see two backup is not the same as the result of:

See more directly the hard disk backup question

1. security risk

Direct drive backup mode, based on the hard disk array storage equipment is based on the file system appears on the server, regardless of the server is to use the server still Media Server, the file system can be operated by free tool, can also be accessed by everyone, even if they mean "DEL" (delete) operations will also be able to destroy all backed up data, which means that the system of maintenance of mishandling or other people's malicious deletion can cause data loss, infections, and many other dangerous cause backup data cannot be restored.

2, performance bottlenecks

First, the file system itself may be a performance bottleneck, especially in the multi-tasking, multi-process status, file system is likely to become the bottleneck of the entire backup system. File system difficult to defragment the hard disk, hard disk fragmentation can cause file system performance gradually decreases, and when a large amount of data, the hard disk is very difficult to deal with the questions.

In addition, some backup software maintenance policy, when a backup to the backup hard drive data transfer limit is reached, there will be written to the hard disk to back up data on one side to the tape library migration status. Backup data from the backup hosts and SAN, dramatically reduce the speed of the backup. Even add backup hard drive capacity, backup speed still difficult to clearly improved.

3. maintain a bulky, expensive

Traditional backup software is based on the library as a backup target. to implement direct backup to a hard disk, you need to backup server or media server as a backup hard drive array create a file system that can be recognized by the backup software. While the usual file system cannot be shared by multiple servers,

This means that if the imagination like using traditional tape library, resolved to implement multiple server SAN jointly use a backup hard drive array, it is necessary to establish in the hard disk array multiple logical equipment, then each logical equipment assigned to each server. This has brought about a series on maintenance, for example how rational allocation of resources, each server can not be additional purchase volume maintenance software to achieve resource allocation of doubt.

Basic direct backup to a hard disk, usually do not have the capacity to optimize as repeating data deleted, compression, and other functions. This needs to be constantly added hard disk array capacity to meet the backup data growth, thereby exacerbating maintenance complex, maintenance costs, and finally lead to direct hard disk backups total cost high speed increase.

4. poor scalability

Direct drive backup questions highlighted in capacity sharing and dynamic expansion. Each backup clients are independent with its own backup space and usually static space configuration, if the modifications are required to migrate the data again, creating a direct extension of the hard drive backup system is very flexible.

Usually, in order to be able to restore a recent backup of high speed data, backup hard drive you want to save a considerable period of time of the backup data. While the backup data as businesses grow increasingly, total backup hard drive capacity, insufficient scalability gaps can seriously impact the performance of the entire backup system.

5, functionality, absence of

A new generation of VTL in replacing the original tape library functions basically, add remote data replication, archiving and automatic offline capacity optimization (compression and de-duplication) and other advanced features. These features not only basic direct backup to a hard disk that does not exist, and also enables data protection point of view to be extended. The data from the deployment of VTL in defense of processing programme, customers not only get data backup functionality, but also get data-level disaster recovery, data archiving and compliance, and backup data capacity optimization of earnings, are at much of treatment programmes.

Virtual tape library (VTL) data protection advantages

The new generation of virtual tape library (D2D2T) storage maintenance more streamlined and enhanced security, performance bottlenecks are addressed with a complete range of features at a lower cost.

1. the security, reliability,

First, from the security of your data access, VTL and tape, determining its nature have immunity. Users cannot directly access the tape, the infected file is not infected with tape storage data, ensure that the backup data is more secure and reliable. At the same time, the virtual tape library-based RAID hard drive arrays, Defense improves reliability.

2. performance and capacity can be extended on demand

Virtual tape library use and physical tape library is similar to the access mode, the absence of a file system on a direct negative impact of the hard disk backup, and be able to fully play out hard drive backup performance advantages.

And, the next generation of virtual tape library performance significantly improved. Their parallel skills at the same time supporting multiple VTL controller to work in parallel and maintain efficient throughput capacity. At the same time, the capacity and performance to improve synchronization or independent, realization of wide range of capacity expansion, providing users with the most flexible and efficient upgrades to choose from.

3. maintenance, dimensionalBasic protection, economic cost

New generation VTL virtual tape libraries work mode resolves backup maintenance software can unify maintenance. Its compatibility and integration is good, no need to change your backup strategy. In a SAN environment, easily implement equipment sharing, easy to maintain and use.

As hard drive backup equipment indirectly, in the later maintenance, because of reduced physical tape library of mechanical failure, its low maintenance costs and more.

4 expansion freely

VTL itself maintains similar to hard drive array of forms that can be easily replaced, add hard disk, capacity expansion. And the parallel application of skills, making equipment more flexible expansion. Therefore, customers will be able to as data volumes grow to implement capacity procurement, preventing a huge budget invested capital.

More importantly, VTL has maintained a physical library application mode, the support of the backup software, logically to achieve seamless expansion of capacity.

5. full-featured, good compatibility

New generation VTL support remote data replication. Resolved to an IP network, the local copy of the backup data to remote offsite virtual tape library system. And, on two virtual tape library building industry between complex is in the background by the virtual tape library. In addition, the new generation VTL also typically haveduplicate data delete, compress, automatic archiving, etc.

Let's use a real-life case studies and solutions for both backup is not the same as in the form of:

A telecommunications industry users of integrated system has dozens of camps, contains comprehensive services, resources, maintenance, settlement, billing system, and set using the system. Every three months for a backup cycle, each backup cycle, the above data generated 2.5TB each full backup data about 20TB. Due to the large volume of data, requiring higher speed of the backup, hard disk array as level backup equipment, when the backup to the backup center data on your hard disk when you reach the upper limit of the migration, backup data and maintaining the software to migrate to the tape library. At the same time, using a different system every day to do full and incremental backup strategy to prevent backup equipment producing I/O bottlenecks. The system backup speed in 40MB/s — 120MB/s.

Use basic hard drive backup

After applying the VTL

Always write hard drive and backup from the hard drive to the secondary backup equipment migration at the same time the status of implementation, the backup performance significantly lower.

SureSaveVTL capacity Extensible space to satisfy immediate 1.79PB. backup storage requirements. At the same time, the backup data to tape library archive does not experience service, does not affect the backup performance.

In order to be able to restore a recent backup of high speed data, back up your hard disk to save the three cycles of backup data. While the backup data as businesses grow gradually added, the total backup hard drive capacity, continue to be insufficient.

Resolve duplicate data deleted, this machine can add significantly to maintain the volume of data. Full backup costs drastically reduced. Incremental backup is no longer necessary. At the same time, 115TB/h i/o rate, further enhance restores performance.
r>Many brand for backup hard disk array equipment and software, not uniform maintenance.

Simulation library work mode, maintaining the software by the backup can be consolidated to maintain. Improve existing resource usage

Unable to use more backup hard drive array in parallel to improve backup performance, selection of high-performance hard drive array, add backup maintenance costs.

Parallel controller and low-cost SATA disk array storage, to achieve the optimal price/performance ratio.

Backup using hard disk arrays also share online business data storage, backup and online equipment sharing one equipment, present a security risk.

Backup data are stored to VTL, and online data separation, prevent backup and online sharing of equipment and reduce security risk.