Abstract: Various systems and methods for placing a virtual machine on one of a plurality of candidate physical machines. For example, one method can involve generating a list that comprises entries for a virtual machine. Each entry in the list indicates a portion of data that is associated with the virtual machine. The method then involves calculating a number of common entries between the list and each of a plurality of candidate lists, where a common entry is an entry that is included in the respective candidate list and in the list. Each candidate list is associated with a computing device. In response to detecting which candidate list has the most common entries, the method involves assigning the virtual machine to the computing device associated with that candidate list.

Abstract: An access request that includes a combination of a file identifier and an offset value is received. If the page cache does not contain the page indexed by the combination, then the file system is accessed and the offset value is mapped to a disk location. The file system can access a block map to identify the location. A table (e.g., a shared location table) that includes entries (e.g., locations) for pages that are shared by multiple files is accessed. If the aforementioned disk location is in the table, then the requested page is in the page cache and it is not necessary to add the page to the page cache. Otherwise, the page is added to the page cache.

Abstract: A method, in one embodiment, can include allowing storage allocation of data of a file system within an object based storage system. Furthermore, the method can include determining if storage allocation usage for the file system is below a threshold. If the storage allocation usage for the file system is not below the threshold, a client is requested to flush its dirty data associated with the file system. After requesting a client flush, the method can include determining the storage allocation usage for the file system. In addition, the method can include determining periodically if the storage allocation usage has reached a quota. If the quota is reached, the quota is enforced for the data of the file system.

Abstract: A method, in one embodiment, can include a server receiving a message to deactivate a partition key of an object based storage system. A token of the object based storage system is signed by the partition key. The object based storage system includes the server. Additionally, after receiving the message, the server can deactivate the partition key to block access to a partition of the object based storage system by a client. The server includes the partition.

Abstract: An access request that includes a combination of a file identifier and an offset value is received. If the page cache does not contain the page indexed by the combination, then the file system is accessed and the offset value is mapped to a disk location. The file system can access a block map to identify the location. A table (e.g., a shared location table) that includes entries (e.g., locations) for pages that are shared by multiple files is accessed. If the aforementioned disk location is in the table, then the requested page is in the page cache and it is not necessary to add the page to the page cache. Otherwise, the page is added to the page cache.

Abstract: A method, in one embodiment, can include a server receiving a message to deactivate a partition key of an object based storage system. A token of the object based storage system is signed by the partition key. The object based storage system includes the server. Additionally, after receiving the message, the server can deactivate the partition key to block access to a partition of the object based storage system by a client. The server includes the partition.

Abstract: A method, in one embodiment, can include allowing storage allocation of data of a file system within an object based storage system. Furthermore, the method can include determining if storage allocation usage for the file system is below a threshold. If the storage allocation usage for the file system is not below the threshold, a client is requested to flush its dirty data associated with the file system. After requesting a client flush, the method can include determining the storage allocation usage for the file system. In addition, the method can include determining periodically if the storage allocation usage has reached a quota. If the quota is reached, the quota is enforced for the data of the file system.

Abstract: A client computer system of a cluster may send a request to create a file in a cluster file system. A server may create a file in response to the information and allocate space in a storage to the file. If a request to write to the file is received within a predetermined amount of time, the write may complete without requiring that additional operations be performed to allocate space to the file. If a write to the file is not received within the predetermined amount of time, the space allocated to the file when it was created may be de-allocated. The file system may additionally or alternatively perform a method for opening a file while delaying an associated truncation of space allocated to the file. If a request to write to the file is received within a predetermined amount of time, the write may be performed in the space already allocated to the file.

Abstract: A client computer system of a cluster may send a request to create a file in a cluster file system. A server may create a file in response to the information and allocate space in a storage to the file. If a request to write to the file is received within a predetermined amount of time, the write may complete without requiring that additional operations be performed to allocate space to the file. If a write to the file is not received within the predetermined amount of time, the space allocated to the file when it was created may be de-allocated. The file system may additionally or alternatively perform a method for opening a file while delaying an associated truncation of space allocated to the file. If a request to write to the file is received within a predetermined amount of time, the write may be performed in the space already allocated to the file.