User's Manual

HP StorageWorks File System Extender Software user guide 143
Maximum number of drives for recall (SystemMaxNumDrivesRecall)
Maximum number of drives for administrative jobs (SystemMaxNumDrivesAdmin)
Maximum number of drives for recovery (SystemMaxDrivesRecovery)
Resource allocation threshold (ResourceAllocationThreshold)
Time step (TimeStep)
Definition Maximum number of drives that can be used for recall by all FSE partitions.
Impact 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.
Definition Maximum number of drives that can be used for administrative jobs.
Impact 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.
Definition Maximum number of drives that can be used for recovery.
Impact 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…).
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.
Impact 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.
Definition System-wide factor by which the priority of the queued jobs is increased due to the age of
the job.
Impact 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.