The interval in seconds over which the data is sampled for each bucket in the part of the ahcf table associated with this ahcfInstanceEntry. If the ahcfConfigObjectType is 'columnar' and the SNMP probe detects at run time that a new instance is available in the table (e.g. a new logical storage media is added to hrStorageTable), then the probe creates a new entry in the ahcfInstanceTable and uses the ahcfConfigDefaultInterval as the value of ahcfInstanceInterval for this new entry. The user can then modify the ahcfInstanceInterval if required to a value more specific to the new entry created (the new logical storage media added to hrStorageTable). Because the counters in a bucket may overflow at their maximum value with no indication, a prudent manager will take into account the possibility of overflow in any of the associated counters. It is important to consider the minimum time in which any counter could overflow on a particular media type and set the ahcfInstanceInterval object to a value less than this interval. This object MUST NOT be modified if the associated ahcfInstanceStatus object is equal to valid(1).