Dell MD3620I, MD3600I owner manual Write-Through Cache

Write-Through Cache

In write-through cache, data is written to the physical disk before completion status is returned to the host operating system. Write-through cache is considered more robust than write-back cache, since a power failure is less likely to cause loss of data. The RAID controller automatically switches to write-through if either cache mirroring is disabled or the battery is missing or there is a fault condition.

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Planning: RAID Controller Modules