Disk Enclosures
cancel
Showing results for
Did you mean:

## Calculating occupancy alarms on HP 8400 EVA

Occasional Contributor

## Calculating occupancy alarms on HP 8400 EVA

Hi all,

We are having a bit of difficulty calculating the occupancy alarm for a HP 8400 EVA. From the HP EVA best practices guide, we use the forumla:

Occupancy_Alarm = 100 – ceiling { [ max ( PDM_capacity, HP Continuous Access_log_sum) + 5GB / total_disk-group_raw_capacity ] }

For example, one of our disk groups has 80 x 300GB disks with a failure protection set to double. Can someone please confirm if I am using this forumla correctly as below:

PDM Capacity = 4 * disk size = 1200GB
HP Continuous Access_log_sum = 4209GB
total_disk-group_raw_capacity = 80 x 300 = 24000GB
Formatted capacity reported by EVA = 21228GB

Therefore:
Occupancy_Alarm = 100 – ceiling { [ 4209 + 5GB / 24000 ] }

= 100 – ceiling { .1755833333 }
= 100 - 18
= 82%

Can someone confirm if these workings are correct as having the alarm set at 82% seems to be pretty low.