Today we continue discussing the best practice from storage engineering:
578) This export of logic is very helpful in overcoming the limitations of static configuration and reload of service. Regardless of the need for a runtime to execute the logic, even listenable config values can help with changes to rules.
579) The rules can be flat conjunctive filters or expression trees. Their evaluation is in program order.
580) The outcome of the processing of rules is the treatment given to the resource. There can be classes in outcome.
581) The number of rules is generally not a concern to compute and it is also not a concern of storage. However, the maintenance of rules is a significant onus and is preferable to avoid first.
582) The type of rules and the classes of outcome generally don’t change even in most heavily used filters. IPSec for example has a lot of attributes to secure the network but its type of rules and outcomes are well-known. Rules can therefore be rewritten periodically to make them more efficient.
583) Storage products have a tendency to accumulate user artifacts such as rules, containers and settings. It should be easy to migrate and upgrade them.
584) The migration mentioned above is preferable to be done via user friendly mechanism because they matter more to the user than to the system.
585) There are several times that customers will run into issues with upgrade and migration. Unfortunately, there is usually no dry run for the instance. One of the best techniques is to plan the upgrade.
578) This export of logic is very helpful in overcoming the limitations of static configuration and reload of service. Regardless of the need for a runtime to execute the logic, even listenable config values can help with changes to rules.
579) The rules can be flat conjunctive filters or expression trees. Their evaluation is in program order.
580) The outcome of the processing of rules is the treatment given to the resource. There can be classes in outcome.
581) The number of rules is generally not a concern to compute and it is also not a concern of storage. However, the maintenance of rules is a significant onus and is preferable to avoid first.
582) The type of rules and the classes of outcome generally don’t change even in most heavily used filters. IPSec for example has a lot of attributes to secure the network but its type of rules and outcomes are well-known. Rules can therefore be rewritten periodically to make them more efficient.
583) Storage products have a tendency to accumulate user artifacts such as rules, containers and settings. It should be easy to migrate and upgrade them.
584) The migration mentioned above is preferable to be done via user friendly mechanism because they matter more to the user than to the system.
585) There are several times that customers will run into issues with upgrade and migration. Unfortunately, there is usually no dry run for the instance. One of the best techniques is to plan the upgrade.
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