Compellent Technologies

Hewlett Packard Enterprise Development LP

Dell International L.l.c.

Michael J Uttormark

Michael James Klemm

A system performs a registration process for monitoring a respective address range, by: receiving, from an application, a first command to monitor a first address range in a kernel; registering, in the kernel, the first address range; creating a monitoring state window in the kernel, the monitoring state window indicating that the first address range is valid; and providing, to the application, read-only access to the monitoring state window. The system detects, in the kernel based on a previous state of a mapping of virtual addresses to physical addresses, a change associated with a memory mapping of a second address range. The system updates the monitoring state window by invalidating address ranges overlapping with the second address range. Responsive to the first address range being valid, the system bypasses the registration process for the first address range.

Kernel memory monitor for user-space mapping change notifications

The present disclosure relates to systems and methods for RAID Restriping. One method includes selecting an initial RAID device for migration based on at least one score, creating an alternate RAID device, moving data from the initial RAID device to the alternate RAID device, and removing the initial RAID device. The method may be performed automatically by the system or manually. The method may be performed periodically, continuously, after every RAID device migration, upon addition of disk drives, and/or before removal of disk drives, etc. One system includes a RAID subsystem and a disk manager configured to automatically calculate a score for each RAID device, select a RAID device based on the relative scores of the RAID devices, create an alternate RAID device, move data from the selected RAID device to the alternate RAID device, and remove the selected RAID device.

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Plymouth, MN, United States of America

Michael J Uttormark