Method used to plan LUN read/write policies

You can plan LUN read/write policies as follows:
1. Planning the write policy
You can select the following write policies during LUN creation: write through, write back and mirroring, and write back without mirroring, mandatory write back and mirroring, and mandatory write back without mirroring. The following is the differences among write policies:
Write through: writes data to disks. Each write operation must access the disk, contributing to low performance but high reliability.
Write back: writes data to the cache and then write data to disks when there are idle host I/Os. Each write operation does not access the disk with high performance but low reliability.
Write back and mirroring: writes data to both the local cache and peer cache simultaneously.
Write back without mirroring: writes data to the local cache.
Mandatory write back and mirroring: Storage devices must write data to the local cache and peer cache simultaneously.
Mandatory write back without mirroring: Storage device must write data to the local cache.
2. Planning prefetch policies
You can select the following prefetch polices: intelligent prefetch, constant prefetch, variable prefetch, and non-prefetch.

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