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Editor to share with you what the NAS backup strategy is, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

With the increasing number of servers, the whole system becomes larger and larger, at this time, if a separate server is used to connect the backup media and act as a media server, then all other servers send the data that needs to be backed up to this server through the network for backup, then this architecture is a very good manageable architecture. One way to solve this situation is to introduce a separate system as the backup agent for the entire NAS device. Before we introduce NAS backup, we must first take a look at a little history. We go back to the days when every computer used a directly connected independent disk storage system, when backup was simply writing data to the corresponding disk, and we installed a data backup software. use it to transfer data directly to a directly connected tape drive. With the increasing number of servers, the whole system becomes larger and larger, at this time, if a separate server is used to connect the backup media and act as a media server, then all other servers send the data that needs to be backed up to this server through the network for backup, then this architecture is a very good manageable architecture. In fact, this architecture is still a very common backup mode, regardless of whether the disk is connected to the server using a SCSI cable or through a FC channel. However, with the growth of NAS devices, we need to look at NAS backups from a different perspective.

Traditional network backup mode

Traditional network backups rely on a backup agent installed on all servers to be backed up. These servers also access NAS devices, and data is transferred from other servers to backup servers over the network, that is, these servers first read the data that needs to be backed up from the NAS device, and then transfer the data to the backup server over the network for backup.

Although this mode does not require any change to the existing backup environment, it is by no means the most efficient. First of all, because the data must first flow from the NAS device to the server through the network, and then the data is sent to the backup server through the network again, which increases the additional network traffic and burden. Second, if the NAS device is shared by multiple servers at the same time, then the backup software is likely to make multiple backups of the same file.

One way to solve this situation is to introduce a separate system as the backup agent for the entire NAS device, that is, the backup of the entire NAS device is done by this independent agent, which exists as a backup client. However, this approach is not suitable for some situations, such as when NAS devices are used to store application-related data, such as databases, which need to be paused or otherwise processed to generate consistent data when backing up.

NDMP backup mode

Network Data Management Protocol (NDMP, Network data Management Protocol) is a protocol specially designed for data backup system of NAS devices. Simply put, it allows a NAS device to send data that needs to be backed up directly to the tape device to which it is connected or to a backup server located on the network without the participation of any backup client agent. That is, the backup server communicates directly with the NAS device to tell the NAS device which storage device to back up the data to (such as tape, etc.). Most mainstream backup software suites, such as BakBone Software, CommVault and EMC, as well as IBM, Tivoli Storage Manager,Symantec 's Backup Exec and NetBackup, support the NDMP protocol and provide different levels of functionality and integration.

However, NDMP mode backups are best suited for file data. In addition to Oracle Secure Backup (which supports NDMP), NDMP does not integrate well with applications such as Microsoft Exchange, SQL, DB2, etc., because these programs need to do some additional actions to ensure data consistency before the backup occurs. This can be done by using custom scripts. They generally require applications to stop running temporarily, so NDMP's backup mode still faces great challenges in most customer solutions.

The above is all the contents of the article "what are the NAS backup strategies?" Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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