Abstract: Technology is disclosed for improving performance during playback of logged data storage operations. The technology can monitor a log to which data storage operations are written before data is committed to a volume; determine counts of various types of data storage operations; and when the counts exceed a specified threshold, cause the data storage operations to be committed to the volume. Some data storage operations can be coalesced during playback to further improve performance.

Abstract: Technology is disclosed for improving performance during playback of logged data storage operations. The technology can monitor a log to which data storage operations are written before data is committed to a volume; determine counts of various types of data storage operations; and when the counts exceed a specified threshold, cause the data storage operations to be committed to the volume. Some data storage operations can be coalesced during playback to further improve performance.

Abstract: Technology is disclosed for improving performance during playback of logged data storage operations. The technology can monitor a log to which data storage operations are written before data is committed to a volume; determine counts of various types of data storage operations; and when the counts exceed a specified threshold, cause the data storage operations to be committed to the volume. Some data storage operations can be coalesced during playback to further improve performance.

Abstract: A processor-based method for adaptive read ahead is provided. The method includes satisfying a read request with sequential reads from a page cache in a first memory and read ahead from a storage memory to the page cache in the first memory, and adjusting upward an amount of data to be read by a cycle of the read ahead, responsive to a determination that a desired page of data for the read request is not in the page cache.

Abstract: Technology is disclosed for improving performance during playback of logged data storage operations. The technology can monitor a log to which data storage operations are written before data is committed to a volume; determine counts of various types of data storage operations; and when the counts exceed a specified threshold, cause the data storage operations to be committed to the volume. Some data storage operations can be coalesced during playback to further improve performance.

Abstract: Technology is disclosed for improving performance during playback of logged data storage operations. The technology can monitor a log to which data storage operations are written before data is committed to a data storage device or a volume; determine counts of various types of data storage operations; and when the counts exceed a specified threshold, cause the data storage operations to be committed to the data storage device or the volume. Some data storage operations can be coalesced during playback to further improve performance.

Abstract: Some embodiments may include multiple computers comprising a multi-level security system. The security system includes a first set of zones and a second set of zones, each having access to resources of a computer, a first security container having a first security label containing the first set of zones, and a second security container with a second security label containing the second set of zones. The resources and data of each of the first and second set of zones inherit the security label of their corresponding security container.

Abstract: Technology is disclosed for improving performance during playback of logged data storage operations. The technology can monitor a log to which data storage operations are written before data is committed to a data storage device or a volume; determine counts of various types of data storage operations; and when the counts exceed a specified threshold, cause the data storage operations to be committed to the data storage device or the volume. Some data storage operations can be coalesced during playback to further improve performance.

Abstract: A system and method for controlling access to a shared storage device in a computing cluster having at least two nodes configured as cluster members provide fencing and quorum features without using the device controller hardware/firmware so fencing can be provided with storage devices that do not support disk reservation operations, such as with non-SCSI compliant disks. A polling thread on each node periodically reads a designated storage space on the shared storage device at a polling interval to determine if its corresponding node registration key is present, and halts the node if the key has been removed. A cluster membership agent removes a corresponding node registration key from the designated storage space of the shared storage device and publishes new membership information indicating that the corresponding node has departed the cluster only after delaying for a time period greater than the polling interval.

Abstract: Some embodiments may include multiple computers comprising a multi-level security system. The security system includes a first set of zones and a second set of zones, each having access to resources of a computer, a first security container having a first security label containing the first set of zones, and a second security container with a second security label containing the second set of zones. The resources and data of each of the first and second set of zones inherit the security label of their corresponding security container.

Abstract: A system and method for controlling access to a shared storage device in a computing cluster having at least two nodes configured as cluster members provide fencing and quorum features without using the device controller hardware/firmware so fencing can be provided with storage devices that do not support disk reservation operations, such as with non-SCSI compliant disks. A polling thread on each node periodically reads a designated storage space on the shared storage device at a polling interval to determine if its corresponding node registration key is present, and halts the node if the key has been removed. A cluster membership agent removes a corresponding node registration key from the designated storage space of the shared storage device and publishes new membership information indicating that the corresponding node has departed the cluster only after delaying for a time period greater than the polling interval.