Selecting surviving storage node based on environmental conditions
A method may select a surviving storage node based on environmental conditions. A request for exclusive access to a volume is received. A score based on data associated with an environment of the node is determined for each node in a cluster. Based on the scores, a node to grant exclusive access to the volume is identified, and such exclusive access is granted to the identified node.
1. A method comprising:
receiving a request for exclusive access to a volume;
determining, for each node in a cluster, a score based on data associated with an environment of the node, wherein the determining includes:
using data from sensors at sites of the nodes in the cluster to determine a value for each sensor based on whether a response from the sensor corresponds to normal or abnormal temperature, power, and seismic activity conditions at the environment of the node,
assigning a magnitude of the value to be positive if the response from the sensor corresponds to normal temperature, power, and seismic activity conditions at the environment of the node,
assigning the magnitude of the value to be negative if the response from the sensor corresponds to abnormal temperature, power, and seismic activity conditions at the environment of the node, and
summing the values for the sensors to determine the score for a particular node;
identifying, based on the scores, a node to grant exclusive access to the volume; and
granting exclusive access to the volume to the identified node.
2. The method of claim 1 , wherein receiving the request for exclusive access to the volume comprises:
receiving a first request from a first node; and
receiving a second request from a second node.
3. The method of claim 1 , wherein
the data is requested from sensors at sites of the nodes in the cluster.
4. The method of claim 3 , wherein
the value for each sensor is determined based on a response from the sensor.
5. The method of claim 4 , wherein determining, for each sensor, the value based on the response from the sensor comprises:
the magnitude of the value is assigned depending on whether the response from the sensor corresponds to normal or abnormal conditions at the environment of the node.
6. The method of claim 4 , wherein
the assigned value indicates the sensor failed to respond to the request for data.
7. The method of claim 3 , wherein requesting the data from the sensors at the sites of the nodes in the cluster comprises:
requesting the data from sensors that measure temperature, power, and seismic activity.
8. The method of claim 3 , wherein determining, for each node in the cluster, the score based on the data associated with the environment of the node comprises:
normalizing the values of the sensors associated with a particular node in the cluster.
9. The method of claim 8 , wherein the values of the sensors are normalized by averaging the scores of the sensors at a particular site.
10. The method of claim 1 , wherein identifying, based on the scores, the node to grant exclusive access to the volume comprises:
selecting the node whose score is at least a threshold amount greater than the scores of other nodes in the cluster.
11. A system comprising at least one hardware processor configured to:
receive a request for exclusive access to a volume;
determine, for each node in a cluster, a score based on data associated with an environment of the node, wherein the processor is further configured to:
use data from sensors at sites of the nodes in the cluster to determine a value for each sensor based on whether a response from the sensor corresponds to normal or abnormal temperature, power, and seismic activity conditions at the environment of the node,
assign a magnitude of the value to be positive if the response from the sensor corresponds to normal temperature, power, and seismic activity conditions at the environment of the node,
assign the magnitude of the value to be negative if the response from the sensor corresponds to abnormal temperature, power, and seismic activity conditions at the environment of the node, and
sum the values for the sensors to determine the score for a particular node;
identify, based on the scores, a node to grant exclusive access to the volume; and
grant exclusive access to the volume to the identified node.
12. The system of claim 11 , wherein the processor is further configured to:
receive a first request from a first node; and
receive a second request from a second node.
13. The system of claim 11 , wherein
the data is requested from sensors at sites of the nodes in the cluster.
14. The system of claim 13 , wherein
the value for each sensor is determined based on a response from the sensor.
15. The system of claim 14 , wherein the processor is further configured to:
the assigned value indicates the sensor failed to respond to the request for data.
16. The system of claim 13 , wherein
the magnitude of the value is assigned depending on whether the response from the sensor corresponds to normal or abnormal conditions at the environment of the node.
17. The system of claim 13 , wherein the processor is further configured to:
request the data from sensors that measure temperature, power, and seismic activity.
18. The system of claim 13 , wherein the processor is further configured to:
normalize the values of the sensors associated with a particular node in the cluster.
19. The system of claim 18 , wherein the values of the sensors are normalized according to a predetermined scale.
20. The system of claim 11 , wherein the processor is further configured to:
select the node whose score is at least a threshold amount greater than the scores of other nodes in the cluster.