Label: Server Storage
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Virtualization technology can bring many advantages to users. For example, VMware's server virtualization technology can create hundreds of virtual machines, which can play the role of several large physical servers. Storage virtualization can turn the potential benefits of a SAN into reality, not only creating a large-capacity storage pool, but also virtualizing capacity as needed.
The rapid development of server virtualization technology is largely thanks to the integration of numerous servers and applications into a small number of physical hardware, enabling the integration of dozens or even hundreds of small physical servers into a few manageable servers. It also ensures logical separation between different applications.
This solution reduces support and maintenance while leveraging the benefits of servers and storage. By combining server virtualization with storage virtualization technology, you can achieve one plus one and two effects. Virtualization of the data center requires both technologies.
Enhanced backup in a virtualized environment
In general, the role of storage virtualization increases as the number of servers being hosted increases. With VMware server virtualization technology, even with only a few physical servers, these servers can run tens or even hundreds of virtual machines. Therefore, the ability to virtualize storage on a virtual server becomes very attractive. If a user runs hundreds of virtual machines and there are ten volumes on each server, there are thousands of volumes in total. SAN-based volume management on the server virtualization backend enables users to quickly and efficiently create volumes for each virtual machine without having to deal with LUN management issues at the array level. Since each volume is a separate volume rather than a DSK file, these volumes can be mirrored, replicated as a snapshot source, and loaded into a standard server without the need for a VMware operating system if needed.
This snapshot feature supports multiple snapshot copies per volume in a virtualized environment and distributes these point-in-time copies to other virtual machines. This allows users to create a powerful test environment by simply creating a snapshot copy of the production data and assigning it to a virtual machine dedicated to testing. Once the user has established a virtual server environment, the user can quickly create a virtual test server. Not only can testers be assigned real-world “real-time†data in seconds, but they can also take snapshots of the data throughout the test.
Because it is very convenient to add and remove virtual machines and applications in a virtual environment, the environment is very dynamic. In other words, the virtual machine is always created, used, and then redistributed or deleted. This brings great flexibility. However, in this highly dynamic environment, you must ensure that storage capacity is provisioned and redistributed in the same simplified manner as virtual servers. Storage virtualization helps achieve this flexibility.
If you have hundreds of virtual machines in your virtual environment, you can increase your backup costs and increase complexity. With the snapshot feature, we don't have to install a backup agent on every virtual machine. We can make a backup by creating a snapshot copy of each virtual server and then assigning those snapshot copies to a virtual machine dedicated to the backup server. In this way, the only virtual machine that needs to install backup software is the backup server. This can help significantly reduce the cost of backup licenses when dealing with hundreds of virtual servers.
As the storage capacity grows exponentially, processing time becomes more important and the backup window disappears. In short, the amount of data is too large, so you can only avoid backups during peak hours. If the snapshot is used as the data source for the backup, then we can back up at any time of the day without disconnecting the application. For many users, this zero-window backup method solves the problem of shrinking backup windows.
Snapshots also have a huge advantage over the overall backup strategy, which is to ensure that point-in-time snapshots are online for a long time. If you need to recover data, you can recover from a point-in-time snapshot in a matter of seconds without using tape. We only need to load the snapshot and access the data, and within a few seconds we can recover from logical failures (such as unintentional deletion of files, viruses, data corruption, etc.) without having to recover data from the tape, which will restore the time from Shortened to a few seconds in a few hours.
Server integration in disaster recovery
Currently, even very small companies require remote mirroring and disaster recovery. This may be determined by policy, company regulations, or by the common sense of company executives. Large enterprises often have the ability to pay large amounts of money for the necessary communications lines, equipment, software, and disaster recovery training. However, small and medium-sized enterprises do not necessarily have this strength, so they will be affected by regional disasters.
From a statistical point of view, the most expensive part of the remote mirroring solution implementation is the communication line deployment between the source and destination sites. With the ability to use snapshot technology for remote mirroring, you only need to transfer snapshot differences, thus avoiding the need to deploy very expensive communication lines between the two sites. Users can use T1 or T3 lines that cost hundreds of dollars per month instead of the higher bandwidth lines that cost tens of thousands of dollars per month.
Remote mirroring is like an insurance policy to ensure that the system continues to work when regional disasters affect the availability of the primary site. Users do not have to allocate resources before the failure occurs. Snapshot-based mirroring technology significantly reduces the amount of data transferred to remote sites, so the resources required are minimal. If the primary site fails, VMware can be used to allocate more virtual machines to support production workloads. Because the remote server is on standby, in case the primary site fails. Therefore, we should use a virtual server instead of a physical server. Remote resources can be temporarily used for other purposes (such as testing). Even if the primary site uses a "physical" server, users can replicate data between the working physical server and the standby virtual server.
Basically, server virtualization and storage virtualization technologies work in a similar way, with physical resources being pooled and placed in storage pools, and then assigned to applications as needed. The advantages of resource virtualization are high efficiency, high utilization, and ease of management. By combining two solutions, we can create a fully virtualized environment that provides users with a high degree of flexibility in reallocating resources as needed.
Virtualization technology is becoming increasingly important in the IT environment. Both server virtualization and storage virtualization have their unique advantages. With the combination of the two technologies, users can really get the full advantage. In addition, the combination of the two technologies can bring unprecedented business opportunities.
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