User manual HP STORAGEWORKS FILE SYSTEM EXTENDER (FSE)

[. . . ] HP StorageWorks File System Extender Software user guide Part number: T3648-96010 First edition: October 2006 Legal and notice information Copyright 2005, 2006 Hewlett-Packard Development Company, L. P. Valid license from HP required for possession, use or copying. Consistent with FAR 12. 211 and 12. 212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U. S. Government under vendor's standard commercial license. [. . . ] The purpose of this parameter is to prevent migration jobs from using all the drives in the FSE implementation. By limiting drives for migration, you ensure that drives remain available for other jobs (recall, administrative, recovery. . . ). You should carefully balance resources according to your environment. 142 Migration, release, recall, and deletion Maximum number of drives for recall (SystemMaxNumDrivesRecall) Definition Impact Maximum number of drives that can be used for recall by all FSE partitions. The purpose of this parameter is to prevent recall jobs from using all drives in the FSE implementation. By limiting drives for recall, you ensure that drives remain available for other jobs (migration, administrative, recovery. . . ). You should carefully balance resources according to your environment. Maximum number of drives for administrative jobs (SystemMaxNumDrivesAdmin) Definition Impact Maximum number of drives that can be used for administrative jobs. The purpose of this parameter is to prevent administrative jobs from using all drives in the FSE implementation. By limiting drives for administration, you ensure that drives remain available for other jobs (migration, recall, recovery. . . ). You should carefully balance resources according to your environment. Maximum number of drives for recovery (SystemMaxDrivesRecovery) Definition Impact Maximum number of drives that can be used for recovery. The purpose of this parameter is to prevent recovery jobs from using all drives in the FSE implementation. By limiting drives for recovery, you ensure that drives remain available for other jobs (migration, recall, administrative. . . ). Resource allocation threshold (ResourceAllocationThreshold) Definition When the Resource Manager tries to assign free resources, it will only consider jobs whose priority is not above the specified threshold of the first job in the queue (a job with top priority). When allocating resources, the Resource Manager takes into account only those jobs whose priority is no less than ResourceAllocationThreshold % lower than the top priority in the queue. The purpose of this parameter is to consider only those queued allocation requests that have a higher priority than a percentage of the priority of the job with highest priority. This ensures some fairness to jobs with higher priorities that need many resources and cannot get all of them at once. For example, if the resource allocation threshold value is 90% and the highest priority is 5000, all jobs with priority higher than 4500 (90% of 5000) will be checked. If you specify 0%, all jobs in queue will be considered for allocation. If you specify 100%, only the first job in the queue will be considered for allocation. Impact Time step (TimeStep) Definition Impact System-wide factor by which the priority of the queued jobs is increased due to the age of the job. The purpose of this parameter is to leverage the elapsed time (the time since the job was started) and increase the priority of jobs that are waiting in the queue. The time factor is multiplied by the number of seconds since the job started, and by the JobTypePriority divided by 100. Note that if you set a value to 0 the job priorities will not get their priorities increased due to the age factor. For example, if the time-factor value is set to 10 and the job (Recall, RecallPriority = 80) has been waiting in the queue for 60 minutes, its priority will be increased by 28800 (10 * 60 min * 60 * 80/100). This will ensure that this job will have a higher priority than any new jobs added to the queue. HP StorageWorks File System Extender Software user guide 143 Phase factor (PhaseFactor) Definition Impact System-wide factor by which the priority of each multi-phase job is increased. [. . . ] An FSE medium to which further writing is disabled, but from which FSE is still able to read data. As soon as the first write error is detected while the Back End Agent is writing data to the medium, the medium is automatically marked as unreliable in the Resource Management Database. Such errors usually occur because of an excessive use of the medium. An FSE medium which has been disabled for both writing to and reading from. [. . . ]