Today we continue discussing the best practice from storage engineering:
323) Cost of storage is sometimes vague because it does not necessarily encompass all operational costs for all the units because the scope and purpose changes for the storage product. The cost is not a standard but we can get comparable values when we take the sum of the costs and divide it for unit price.
324) Cost is always a scalar value and usually calculated by fixing parameters of the system. Different studies may use the same parameters but have widely different results. Therefore, it is not good practice to compare studies unless they are all relatively performing the same.
325) The total cost of ownership encompasses cost for operations and is usually not reflected on new instances of the storage product. It is used with products that have been used for a while and are becoming a liability.
326) A higher layer that manages and understands abstractions, provides namespace and data operation ordering is present in almost all storage management systems
327) A lower layer comprising of distribution and replication of data without actually requiring any knowledge of abstractions maintained by the higher layer is similarly present in almost all storage products.
328) Similarly, the combination of the two layers described above is almost always separated from the front-end layer interpreting and servicing the user requests.
329) Working with streams is slightly different from fixed sized data. It is an ordered set of references to segments. All the extents are generally immutable.
330) If a shared resource can be represented as a pie, there are two ways to enhance the usage: First, make the pie bigger and the allocate the same fractions in the increment. Second, dynamically modify the fractions so that at least some of the resource usages can be guaranteed some resource.
323) Cost of storage is sometimes vague because it does not necessarily encompass all operational costs for all the units because the scope and purpose changes for the storage product. The cost is not a standard but we can get comparable values when we take the sum of the costs and divide it for unit price.
324) Cost is always a scalar value and usually calculated by fixing parameters of the system. Different studies may use the same parameters but have widely different results. Therefore, it is not good practice to compare studies unless they are all relatively performing the same.
325) The total cost of ownership encompasses cost for operations and is usually not reflected on new instances of the storage product. It is used with products that have been used for a while and are becoming a liability.
326) A higher layer that manages and understands abstractions, provides namespace and data operation ordering is present in almost all storage management systems
327) A lower layer comprising of distribution and replication of data without actually requiring any knowledge of abstractions maintained by the higher layer is similarly present in almost all storage products.
328) Similarly, the combination of the two layers described above is almost always separated from the front-end layer interpreting and servicing the user requests.
329) Working with streams is slightly different from fixed sized data. It is an ordered set of references to segments. All the extents are generally immutable.
330) If a shared resource can be represented as a pie, there are two ways to enhance the usage: First, make the pie bigger and the allocate the same fractions in the increment. Second, dynamically modify the fractions so that at least some of the resource usages can be guaranteed some resource.
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