Lsi Logic Corporation

Netapp, Inc.

Lsi Corporation

Jinchao Yang

Lance A Lesslie

Jason Owens

Systems and techniques for varying the spindle speed of a hard disk drive are disclosed. In some embodiments, the systems and techniques involve a hard disk drive (HDD) that is accessible to a storage controller. A spin speed of the HDD is set to a full spinning speed, and an amount of time that the HDD is unassigned is compared to a threshold. After detecting that the threshold is exceeded, the spin speed of the HDD is decreased to a reduced spinning speed. Likewise, upon determining that the HDD is assigned, the spin speed of the HDD is increased to the full spinning speed. In various such embodiments, assigning the HDD may include assigning the HDD to a volume group or assigning the HDD operate as an in-use hot spare.

Variable spinning rates for hard disk drives

A method and system for detecting and isolating memory leak in RAID controllers utilizing sequence numbers. The system monitors whether the count of un-freed memory blocks for a sequence number (SN) zone (after a start-of-day SOD operation, but smaller than the current sequence number zone) is not eventually decremented to zero. The memory leak can be detected when un-freed memory blocks exist and follow a similar pattern with respect to all other adjacent SN zones. The detected memory leak can be isolated utilizing shell commands, task information, caller information, sequence number, memory allocation size and a pointer to the next allocated memory block.

Zero-penalty RAID controller memory leak detection and isolation method and system utilizing sequence numbers

A method and system which uses the method maintains data integrity during file transfers from a local drive medium to a RAID controller flash memory. A signature is added to the data file in the local drive by a utility program. The signature is multibyte and, preferably, is either four or eight bytes long. The RAID controller is loaded with software that traverses the data file until the signature is found. The RAID controller software discards the signature and any after patched data and stores the stripped off data into its flash memory. The utility program overcomes potential incompatibility between the file transfer protocol and a terminal emulation program.

Method to maintain data integrity during flash file transfer to raid controller flash using a terminal emulation program

A system and method for handling shared resource writes arriving via non-maskable interrupts in single thread non-mission critical system with limited memory space includes a queue for providing temporary storage of a write request. The queue is accessible by lower or higher priority processes for the servicing of the write requests. Upon completion of service to the write requests the system returns control to the standard operations of the single thread system.

System and method for handling shared resource writes arriving via non-maskable interrupts (NMI) in single thread non-mission critical systems with limited memory space

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Wichita, KS, United States of America

Jinchao Yang