Storage activity is one of the most important links in the data center high availability architecture. However, there are many difficulties in the storage livelihood construction practice. In the following, four issues that are unavoidable in the implementation process are sorted out and analyzed.
1. How to plan the storage active modeThe storage live-active construction plan must be based on the database dual-active solution. Only by clarifying the working mode of the database and related application programs, can you be able to do a good job of the storage-active live-selection planning; otherwise, the storage live-active In terms of construction, any technical details are empty talks.
If the database or application is only deployed in active/standby mode, it is relatively easy to build dual-active storage. The use of snapshots such as flashcopy or SRDF-like disk mirroring can meet the demand; of course, this synchronization and disaster recovery method is sufficient. Concerned that because the source and destination storage need the same product, it cannot solve the heterogeneous problem, and most of the synchronization tools that use this type require license authorization, increase the cost, and the low-end storage generally cannot replicate the function. Therefore, strictly speaking, That said, it can't really be considered as a storage activity.
If a DB2 pureScale or Oracle RAC database cluster is established, then the storage virtualization gateway can be put to use. This is the most common method for storage and live networking, such as the use of SVC and VPLEX for storage AA (acTIve-acTIve) ) Double live mode. The following difficulties are also discussed on this premise.
2. How to Solve the Single Storage "Isolated Island" and Improve the Overall Effectiveness of the Storage Resource PoolIn general, enterprises are implementing storage virtualization gateways to build a storage-and-active system in the process of building an active-active hub or a new storage system. This stage is also a good plan for establishing and planning an enterprise unified storage resource pool. The existing heterogeneous storage is highly integrated and solves the "islanding" phenomenon existing at each storage level. For services that have experienced IO bottlenecks, they may also consider introducing all-flash storage to accelerate hotspot data, and use functions such as easy TIer in the SVC virtualization gateway to improve the overall performance of the storage pool.
3. How to Design Active-active Storage High Availability to Prevent Arbitrage from Preventing Brain SplittingIn the AA mode active-active storage, under certain specific multiple faults, the arbitration mechanism will preferentially ensure the consistency of the data and may stop all the LUNs on the active-active storage from being accessed by the host. Therefore, when designing the arbitration mode, it is recommended to establish a third-party site as the arbitrator. However, this cannot be completely avoided. Therefore, the forced start must be considered. However, the forced start-end storage serves as the source of synchronization and will recover after the link recovers. Synchronize incremental difference data.
4. How to achieve read and write separation, improve IO read and write efficiencyAfter storage active, there is another difficulty that cross-site access of hotspot data, and the implementation of the database and storage layer active at the same time, there will be data competition issues, which also reduces the IO efficiency. At this time, the lock prefetching and caching strategy is used to apply for the write permission to the lock permission cache node through a smaller control message, and the partial write permission is cached locally by using the lock prefetch. In this way, subsequent sequential write I/O operations can quickly hit the local site, reduce cross-site data transfer and interaction, and achieve read/write separation, thereby improving IO read/write performance.
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