摘要:
Embodiments maintain high availability of software application instances in a fault domain. Subordinate hosts are monitored by a master host. The subordinate hosts publish heartbeats via a network and datastores. Based at least in part on the published heartbeats, the master host determines the status of each subordinate host, distinguishing between subordinate hosts that are entirely inoperative and subordinate hosts that are operative but partitioned (e.g., unreachable via the network). The master host may restart software application instances, such as virtual machines, that are executed by inoperative subordinate hosts or that cease executing on partitioned subordinate hosts.
摘要:
A storage management device records write requests that are directed to a data store. In one embodiment, the storage management device records a plurality of write request entries, each one of which includes information relating to a write request, in at least one first database table, and maintains, for each first database table, at least one record in a second database table. The one or more records in the second database table include data representing the effects of the write requests on a state of at least one portion of the data store. In one such embodiment, each time that one write request entry is recorded in one first database table, the storage management device updates at least one record in the second database table.
摘要:
A storage management device records write requests that are directed to a data store. In one embodiment, the storage management device records a plurality of write request entries, each one of which includes information relating to a write request, in at least one first database table, and maintains, for each first database table, at least one record in a second database table. The one or more records in the second database table include data representing the effects of the write requests on a state of at least one portion of the data store. In one such embodiment, each time that one write request entry is recorded in one first database table, the storage management device updates at least one record in the second database table.
摘要:
The invention relates to systems, methods, and articles of manufacture for generating an image of a data store at a past time by using a map (e.g., a time map) of the locations of data stored in the data store at the specified past time. The map allows the data storage system to quickly determine the locations of data stored in a data store at a past time, without searching the entire index of records concerning the locations of the past data.
摘要:
Embodiments maintain high availability of software application instances in a fault domain. Subordinate hosts are monitored by a master host. The subordinate hosts publish heartbeats via a network and datastores. Based at least in part on the published heartbeats, the master host determines the status of each subordinate host, distinguishing between subordinate hosts that are entirely inoperative and subordinate hosts that are operative but partitioned (e.g., unreachable via the network). The master host may restart software application instances, such as virtual machines, that are executed by inoperative subordinate hosts or that cease executing on partitioned subordinate hosts.
摘要:
A method, apparatus, and system for accessing units of storage in at least one logical unit by processing I/O requests directed to the logical units using a LUN queue and an operation-type queue. By using the queues to process the I/O requests, the requests can be processed without address collisions.
摘要:
The disclosed technology can be used to develop systems and perform methods that receive and process I/O requests directed to at least a part of a logical unit of storage. The I/O requests can be associated with different times corresponding to when such I/O requests were received. Nodes that include non-overlapping address ranges associated with the logical unit of storage can be formed in response to receiving the I/O requests and such nodes can be subsequently organized into a tree data structure. The tree data structure can serve as a basis for determining address overlap, for example to enable processing a first operation associated with a first one of the I/O requests in accordance with the first I/O request's receipt time, while one or more other operations associated with a different I/O request may be processed irrespective of that different I/O request's receipt time. This can be useful in a system in system operations are improved by easy access to information about whether pending I/O requests are directed to overlapping units of storage.
摘要:
The disclosed technology can be used to develop systems and perform methods that receive and process I/O requests directed to at least a part of a logical unit of storage. The I/O requests can be associated with different times corresponding to when such I/O requests were received. Nodes that include non-overlapping address ranges associated with the logical unit of storage can be formed in response to receiving the I/O requests and such nodes can be subsequently organized into a tree data structure. The tree data structure can serve as a basis for determining address overlap, for example to enable processing a first operation associated with a first one of the I/O requests in accordance with the first I/O request's receipt time, while one or more other operations associated with a different I/O request may be processed irrespective of that different I/O request's receipt time. This can be useful in a system in system operations are improved by easy access to information about whether pending I/O requests are directed to overlapping units of storage.
摘要:
The invention relates to systems, methods, and articles of manufacture for generating an image of a data store at a past time by using a map (e.g., a time map) of the locations of data stored in the data store at the specified past time. The map allows the data storage system to quickly determine the locations of data stored in a data store at a past time, without searching the entire index of records concerning the locations of the past data.
摘要:
A method, apparatus, and system for accessing units of storage in at least one logical unit by processing I/O requests directed to the logical units using a LUN queue and an operation-type queue. By using the queues to process the I/O requests, the requests can be processed without address collisions.