高性能计算平台中StorNext并行文件系统及存储解决方案.pptVIP

* Slide Objective: Discuss Enhanced Stores Min Set Size -- Typically specified in MBs or GBs. When all of the store candidates in the class add up to this value, the whole set can be stored to tape. Max Set Age -- Typically specified in hours. Works in conjunction with Min Set Size so that files will not sit forever on the candidate list because the Min Set Size hasnt been reached. As soon as any file on the Store Candidates list in the policy class is this old, all of the files should be stored. Run Time - Can be a of a list of run times or one run time and repeat duration. Auto Disable -- Typically Yes/No or Enable/Disable. This is used to stop the policy engine from storing any files in this policy class. Additional policy controls will be added: An “Auto Store” parameter will be added to the policy class. This will default to off in upgrades. * Which: specific file list Slide Objective: Discuss policy classes and their purpose. Policies are the “scripts” which determine when migration, relocation, and truncation occur. Policies are run at user-defined intervals and can be customized to fit a particular environments needs. Policies are applied to directories, and are inherited by subdirectories. That said, if a policy is applied to a subdirectory, the higher level policy is ignored and only the subdirectory’s policy is used (i.e. non-additive) Relocation allows files to be moved to a different class of disk. This group of disk is a stripe group within the existing file system, allowing the file to be moved without clients noticing a change in location. Relocation is performed on a file list, not specifically all files in a directory. Typically, data is migrated first and then relocated. Then truncation will be applied to the relocated file. Note: Relocation does require a file to be migrated. Relocate only is not currently available. * Slide Objective: Discuss policy classes and their purpose. Policies are the “scripts” which determine when