What are the criteria for testing the segment or level of a storage engineer (to be exact, a pre-sales engineer)? It is a question that Xiaobian often thinks about. In the past, he looked at what the predecessors wrote about the 7-level pre-sale and 8-level pre-sale, what kind of Cainiao-level, bronze-level, cinerary-level and so on. Xiaobian thought, as a qualified pre-sales person, he is not only talking on paper, knowing his own product parameters, making a configuration, knowing the technical competition of friends, writing a plan, and so on. Of course, every segment has a living space, xiaobian has also seen many pre-sales engineers who have not even operated their own products. They have also done very well. They can not only fool the customers, but also the number is not bad. You ask him to say, he can talk about it in a peaceful way. If you let him operate, he may know nothing about it. He doesn't work, and he doesn't operate the actual combat faction. Of course, it doesn't affect the scheme. We all know that, Storage is a solution with complex logic and high stickiness. Compared with computing, the solutions you write, the topological diagrams you draw, and the implementation steps, if you have done it yourself, I think, when communicating with customers, I will go deeper and capture the pain points of customers. I can understand the language of customers. Storage is a very sticky solution, and it is also good to do the operation and maintenance of storage, as for the solution, the stored resources are used to provide services for computing or businesses, whether blocks, files, or objects. They must be identified and mounted by the host for use by databases or other businesses, you need to know how the host uses storage, such as multi-path configuration, disk identification, formatting, cifs or NFS in linux of mount mount and so on, especially the replacement of new and old storage, is a high requirement for storage engineers, or is the most difficult storage scenario. If you do a storage solution, the peak of storage engineers is to migrate data independently or with database engineers or business departments, especially with databases such oracle this scenario.

More than ten years ago, when the editor refused to do after-sales work, as a pre-sales job, he worked hard to store and replace data migration. The scene is still deep in memory, small machine AIX oracle 18 storage and master storage,5 business, back and forth, spent more than half a year.

For typical scenarios, Linux oracle for an old storage, share, what solutions are available in the industry, such as storage virtualization migration, business host-side migration, etc. The previous section of the editor is the storage virtualization gateway method, which is block, but it is not easy, especially SAN the network has to stop the service, the host side can not stop, the following focus recommend this solution.

Generally, the host is RAC, the disk is through asm the managed disk group. Each server is configured with dual ports. HBA card, generally, each card uses one port, and the other port is useless. We can connect this useless port with the new optical intersection and storage, and draw a good line zone, map the new storage.

Procedure:

①, jumper: useless HBA port and new storage connection cable;

②, row zone: optical communication is planned according to the previous plan. zone;

③, split: divide the new storage into disks according to actual requirements, such5 number1T data disk,5 number5G arbitration plate,1 number2T the backup disk;

④, alias: The host scans for new disks, multipath -ll, multipath service restart, etc., alias;

⑤, add disk: add a new disk asm in the disk group, such as the previous asm old storage in management11 disks, new storage is coming again11 A plate, put asm add this new disk Group11 disks;

⑥, data balancing: data rebalancing, similar to storage RAID, the same as data balancing, the storage space will be rebalanced;

⑦, kick plate: after data balancing is completed, the old11 remove disks, you can oracle in the graphical interface, you can also in the command line, it is recommended that the graphical interface, relatively simple and intuitive, disconnect or delete the soft connection (if this continues to open, you can still see the old disk), you can kick one by one. To be conservative, only new ones are left.11 disks;

⑧, observation: run for a week. If there is any problem, you can add the old disk back. If there is no problem, the old disk will be recycled and the old line will be unplugged;

, completed.

Jiuyin Zhenjing, before doing it, if conditions permit, it is recommended to do a data backup.

The above is for data migration9 footwork, Xiaobian thinks, as a storage engineer, it is better to be able to practice before or after sales. Some of them may not be able to do it, but at least the steps need to be known, and communication and cooperation are also good, operating system engineers, database engineers DBA it is also good to cooperate, because the storage is relatively professional, sometimes the database DBA only disks can be used, and it is inevitable that we are not familiar with storage. This is also a normal phenomenon. We need storage engineers to understand the overall steps of data migration or storage migration. In this way, only in this way can a storage be replaced from an old one to a new one to achieve the purpose of cutover.

As a qualified storage engineer, if you are a pre-sales engineer, you may not operate, but it is best to know the steps, which is not harmful to the pre-sales, it also reflects the inspection standards of senior storage engineers or ashes-level engineers, rather than simply speaking without actual combat. Of course, as an after-sales engineer, it is better to operate.

Therefore, Xiaobian personally believes that as a pre-sales person, the test standard is whether the storage data will be migrated or not. The peak of the storage project is not too high, and it cannot be operated. It must also be said that, in this way, in order to talk with customers to the greatest extent and have a common language, we can have a better customer experience. It is suggested that storage pre-sales engineers put this9 step, recite skillfully and blurt it out.

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