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Tiered storage device #151
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…o page-blob-device
… tests to also run for AzurePageBlobDevice.
# Conflicts: # cs/src/core/Device/AzurePageBlobDevice.cs
…k in commit point for write request.
# Conflicts: # cs/src/core/Device/LocalStorageDevice.cs
…into tiered-storage-device
…red-storage-device # Conflicts: # cs/src/devices/AzureStorageDevice/AzureStorageDevice.cs # cs/src/devices/AzureStorageDevice/BlobEntry.cs # cs/src/devices/AzureStorageDevice/FASTER.devices.AzureStorageDevice.nuspec # cs/test/BasicDiskFASTERTests.cs
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Rough draft of tiered storage support in FASTER. So far it is assumed that all storage are inclusive (higher tiered storage are considered caches of lower tiers), and the bottom layer is assumed to always be unbounded in capacity. There are no guarantees of synchronizations between layers at any point, although eventually all writes will be issued once to layers that store the address range. (I don't believe there are ordering guarantees)
Two things that need to be elaborated and worked on:
What level of concurrency is expected to happen at this level? TheIDevice
layer certainly sits under the highly concurrent frontend, but tiered storage brings more complexity and we may need the epoch protection framework in this layer.What happens on recovery? Recovering ranges of each storage device is not supported right now. Depending on the commit point, there might also be some recovery work to do for the content on storage (they might not be always consistent)Fix #138
Dependent on #147