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Write-Back cache questions
I have an application that needs to make frequent small durable writes. I want to make sure the LUNs I'm writing to are in write-back mode. I assume that would mean the write would not return until it made it to the battery backed cache. That should satisfy my durability requirement.
Is it possible to configure the CX300 write cache to be write-back? Or is that the way it works by default?
My linux hosts list the write caches for the LUNs as write-through. Should I trust what it's saying?
How can I verify that the caching is write-back and not write-through?
I am using an fsync to push the data though the OS buffers to the array. Ideally, that op would return once the data made it to the CX300 cache and would not wait for the data to be written to disk. Are there any configuration gotchas I should be looking for?
Is it possible to configure the CX300 write cache to be write-back? Or is that the way it works by default?
My linux hosts list the write caches for the LUNs as write-through. Should I trust what it's saying?
How can I verify that the caching is write-back and not write-through?
I am using an fsync to push the data though the OS buffers to the array. Ideally, that op would return once the data made it to the CX300 cache and would not wait for the data to be written to disk. Are there any configuration gotchas I should be looking for?
