Data backup is extremely important to enterprises, especially in the face of natural disasters and other factors on enterprise itself caused a large number of stored data after the damage, the effect of disaster recovery can be a good experience out.In the information systems in general become the lifeblood of today's business operations, by constructing a remote disaster recovery mechanisms to ensure business continuity, enterprise management has been generally recognized.However, many types of remote disaster recovery technology, and the most complex structure, not only into hardware and software equipment and the huge cost of time, subsequent maintenance costs were prohibitively high, so, despite the large number of interested builders, but most hesitate.
To tape-based backup for remote disaster recovery, is widely used enterprise approach, managers will only regular data backup to offline tape, and then transported to the remote through the preservation of human can be, if there is a disaster, we should firstIT infrastructure repair, and then restore from tape systems and data.Although such a remote disaster recovery means the lowest cost, but the long recovery time (usually several days or even weeks) caused by operating losses, and backup / recovery time caused by non-real-time data loss, clearly beyond thethe scope of today's business can suffer.Ideal for remote disaster recovery framework should be based on unlimited web-based WAN, remote data replication (Remote Replication) technology, on-line (on-line) Disaster Recovery in order to meet enterprise RTO and RPO requirements.
Through the network connection, the local side to the remote copy of data stored, may sound easy, but the IT architecture in a complex, in order to successfully realize they do not 容易.After several years of technical development, online remote disaster recovery to produce the following two types: host (Host based) and the storage system type (Storage based).
Host-based remote disaster recovery: very limited
Host-based remote disaster recovery, simply, is that by installing the server's data replication software (such as Veritas Volume Replicator), or the application provides the data replication / disaster recovery tools (such as Oracle Flash Recovery Area), using TCP / IPnetwork capacity to connect a remote standby server, an asynchronous approach to data replication.
Host advantage of remote disaster recovery server is under less environment, Suoxu the 成本 low, the user no need to replace the existing system architecture Tai Duo or worry about back-end Cunchu system compatibility issues, just to paysoftware license fees and hardware costs of disaster recovery can end.However, if a large number of the server environment, management will increase the complexity of the overall input costs will increase.Another drawback is that it is De software installation on the host application program, Yun Xing O'clock consume the host's operating Zi Yuan, Ru Guo hardware of Deng Ji Bu Gao, application procedures can be brought to give effect.
Long-range disaster recovery storage systems: the high cost of
Long-range disaster recovery storage systems, by definition is based on the storage system (optical disk array, NAS) model.Built through the storage system firmware (firmware) or operating system, through the IP network, or DWDM, Fibre Channel and other transport interfaces link the data to the way synchronous or asynchronous replication to the remote.Well-known long-range disaster recovery plan storage systems have SRDF, TrueCopy, PPRC, etc..
Compared with the host-based remote disaster recovery, storage systems, the advantages of long-range disaster recovery is to separate the data and run on the host system running a relatively small resource implications.In addition, since most operating system to use the image (mirror) to copy the data, and buffer memory with Gao Su Jia Su I / O access, Data discrepancies across time Dian relatively small, Jiashangcunchu system Benshenjubei Yiding of fault tolerance, with certainoperational performance and reliability.
The long-range disaster recovery storage systems, the maximum limit on the construction of its expensive cost.As the user must end and disaster recovery in the local side were two sets of the same storage system configuration, not only the procurement costs are high, but also subject to a single equipment manufacturer, is bound to the future expansion of the lack of flexibility.In addition, the Fibre Channel storage system if you want to build a remote disaster recovery, and disaster recovery must be locally installed on one end of the FC-to-IP adapter, the hardware cost will be more than 50,000 U.S. dollars, plus the cost of network bandwidth, thenThe overall cost of inputs will be staggering.If the enterprise has not been carefully evaluated prior to installation, then build long-range disaster recovery storage systems is likely to lead IT spending in the black hole, increase the financial burden.In addition, the storage system-based disaster recovery, disaster recovery mode for the consistency of the database a lot of deficiencies, in little more than point to the existence of non-applicability of disaster recovery architecture.
In addition to these two architectures in addition, are no better company to choose? No! Recent years, the United States, FalconStor Software, Inc. (FalconStor), represented by the network storage software solutions, successfully developed to store networkCustoms (Storage Gateway) as the core storage network-based (Storage Network based) remote disaster recovery program, which is not only a combination of host and storage system architecture of the advantages of long-range disaster recovery, but also breaking the construction costs topped the remote disaster recoveryno less than the ice, becoming the most popular at this stage Disaster Recovery Technology.
Storage network-based remote disaster recovery architecture, is the front-end application servers and back-end storage systems for storage area network (SAN), adding a layer of storage gateway, the gateway and network gateway as we know it is different to the U.S.FalconStor Software, Inc. program, for example, a combination of IPStor storage management software and dedicated manager, front-end connection to the server host to connect back-end storage devices, it is like the role of storage in the network traffic police, all the I /O is controlled by its management.
Storage network-based remote disaster recovery: inclusive
Or to FalconStor's IPStor as an example, IPStor remote disaster recovery operation mode, a combination of host-side agent (Agent) and snapshot function (TimeMark), creating a snapshot copy of host data, copied over the network to a remote disasterPreparation of the site.Because IPStor is used only to change the data model for data replication, therefore, the lower the bandwidth required, the local side and the link between the disaster recovery side, you can use relatively inexpensive IP networks.
Storage network-based remote disaster recovery advantages can be said is a culmination of the above two kinds of architecture.As the data replication is to perform through the storage gateway, application server, database implementation of the agent only, as opposed to host a remote disaster recovery, it is very low performance impact.In addition, through storage virtualization gateway technology, integration of heterogeneous platforms, front-end servers and back-end storage devices of different brands, the local side, and disaster recovery side of the device without paired configuration, the user can RTO and RPO, in the remoteestablish a complete hot backup center, a disaster when the local side immediately takes over operations run; or take only storage device in the disaster recovery Duan Anzhuang the temperature Zhan Pei Zhi, Xian to protect data integrity and security, after the completion of the locally Xiufufurther recovery.
In addition to the above do not take up the host operating resources, and do not have the limitations of storage platform characteristics, the cost of storage networks is the biggest advantage of long-range disaster recovery.
First of all, no need to replace when the original building IT infrastructure, only in the original by adding storage storage area network gateway, a local host and storage devices can be any brand, disaster recovery side of the host and storage devices are not required andlocally the same, the user can even lower grade end is disaster recovery storage systems (such as SATA disk array), according to statistics, the investment cost savings of up to 30-50%! for those who are keen on building a remote disaster recovery needsThe very limited IT budget, clients, storage network-based remote disaster recovery is undoubtedly the best option.
Second, special agent for the database, storage, network-based remote disaster recovery to ensure that the database and start with a complete disaster recovery capabilities, without worry about the phenomenon can not start.
More importantly, the stored data on the more value-added features such as snapshots, can make all kinds of data, the destruction of all ability can be instantly restored, it is one of the most complete disaster recovery system, it coversdisaster far beyond the scope of the foregoing against all kinds of ways.In this disaster recovery system, construction of disaster recovery is no longer difficult, disaster is no longer a very terrible thing.