Command heat_map_printer is available in 3.0.2 and can be downloaded for
2.6.4 cluster ( ithaca: ~jerome/heat_map_printer.2.6.4)
heat_map_printer should be run on a running active cluster.
heat map printer calculates how many extent groups were accessed in each
tier during last six hours on all the nodes.
On 400 G SSD-PCIe card, 200G is used for extent groups (stargate-data),
with replication factor 2, only 100 G is available per node.
Column 1 : tier accessed during last X seconds.
Column 2: Access between that time frame
( between 300 sec and 600sec - 3930 extent groups were accessed)
Column 3: Cumulative access.
( from 0 to 600 sec 15907 = 11977 + 3930 extent groups was accessed )
Extent Group is 16 MB in size, so within less than 5 minutes, 11977 extent groups
were accessed, so total GB will be ( 11977 * 16)/1024.
It divides based on SSD, HDD and total histogram. The data accessed will be
more accurate within last 15 minutes in SSD and after 30 minutes in HDD, because
of less ILM migrate activities in that tier.
The last one lists the name of VMDK and how busy each of the VMDKs were in