Swap partition is a disk space that is not available for storing any
kind of data other than memory dumps. So - I think it is perfectly fine
to assume that the size of swap sums up with used space.
** Changed in: nova
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1615903
Title:
free_disk_gb is not correctly, because swap disk size is not minus.
Status in OpenStack Compute (nova):
Invalid
Bug description:
1. code in compute/resource_tracker.py
def _update_usage(self, usage, sign=1):
mem_usage = usage['memory_mb']
disk_usage = usage.get('root_gb', 0)
overhead = self.driver.estimate_instance_overhead(usage)
mem_usage += overhead['memory_mb']
disk_usage += overhead.get('disk_gb', 0)
self.compute_node.memory_mb_used += sign * mem_usage
self.compute_node.local_gb_used += sign * disk_usage
self.compute_node.local_gb_used += sign * usage.get('ephemeral_gb', 0)
self.compute_node.vcpus_used += sign * usage.get('vcpus', 0)
# free ram and disk may be negative, depending on policy:
self.compute_node.free_ram_mb = (self.compute_node.memory_mb -
self.compute_node.memory_mb_used)
self.compute_node.free_disk_gb = (self.compute_node.local_gb -
self.compute_node.local_gb_used)
self.compute_node.running_vms = self.stats.num_instances
2. So I think self.compute_node.local_gb_used is contained swap disk
size. And free_disk_gb is not minus swap disk size.
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