Texas Instruments Corporation

Emc IP Holding Company LLC

Qualcomm Incorporated

Dell Products Inc.

Srikanth Srinivasan

Ramprasad N Chinthekindi

Devraj Matharampallil Rajagopal

Abhinav Duggal

Rajat Chauhan

Nitin Madan

Lan Bai

Neeraj Bhutani

Jhankar Malakar

Mahadev Karadigudda

Srisailendra Yallapragada

Madhu Agrahara Gopalakrishna

Bharat Gajanan Hegde

Pranshu Kalra

Sagar Bhogela

Daisy Cynthia

A method of blocking access to files encrypted with a compromised key by mapping keys and ranges of containers encrypted by the keys. Upon notification that a key is compromised, fencing a container range corresponding to data segments encrypted by the compromised key to prevent deduplication operations on the segments. The method makes a point-in-time copy of the filesystem managing the segments, wherein each file of the file system is represented as tree structure having a root level and other levels. The method iteratively inspects in a level-wise manner, each container in each level of the file trees of the files to identify containers having segments encrypted by the compromised key, and marks files corresponding to the identified containers as not readable to block the access to the files encrypted with the compromised key.

Disallowing reads on files associated with compromised data encryption keys

An Inter-IC interface with a glitch filter including at least two cascaded RC filters configured to compensate a signal skew of the data or clock signal received from a data communication or clock signal line, feedback switches configured to pull up or pull down a voltage at an output node of each of the at least two cascaded RC filters, and feedforward transistors configured to condition a respective switch to the feedback switches to accelerate the pull up or the pull down.

Robust noise immune, low-skew, pulse width retainable glitch-filter

An index associates fingerprints of file segments to container numbers of containers within which the file segments are stored. At a start of migration, a boundary is created identifying a current container number. At least a subset of file segments at a source storage tier are packed into a new container to be written to a destination storage tier. A new container number is generated for the new container. The index is updated to associate fingerprints of the at least subset of file segments to the new container number. A request is received to read a file segment. The index is queried with a fingerprint of the file segment to determine whether the request should be directed to the source or destination storage tier based on a container number of a container within which the file segment is stored.

Non-disruptive and efficient migration of data across cloud providers

A circuit that includes a first diode, a second diode, a comparator having a comparator first arm and a comparator second arm, and an inverter. The first diode has a first terminal coupled to a first node and a second terminal. The second diode is coupled in series between the second terminal of the first diode and a second node. The comparator first arm includes a first plurality of transistor devices and is coupled to a third node. The comparator second arm includes a second plurality of transistor devices and is coupled to the second node, wherein the second plurality of transistor devices is greater in number than the first plurality of transistor devices. The inverter has an input coupled to the comparator and an output coupled to a fourth node.

Buffer circuit

Data containers are stored at a first cloud and include file segments managed by a deduplication file system. Metadata containers are written to a log, identified by a container ID generated sequentially, and include references to data containers. An index is maintained to map segment fingerprints to container IDs. Upon starting a migration to a second cloud, a checkpoint is created identifying a container ID at a head of the log. During migration, the index is updated to map fingerprints of migrated segments to new container IDs, and referencing new data containers having the migrated segments and written to the second cloud. A request to read a file is received. The index is examined to identify a container ID associated with a data container storing segments of the file. Based on the identified container ID and the checkpoint, the data container is accessed from the first or second cloud.

A receiver includes a low-side buffer having an input terminal coupled to receive an input signal and having an output terminal coupled to a buffer terminal. Responsive to the input signal being LOW, the low-side buffer is configured to couple the buffer terminal to ground. The receiver also includes a high-side buffer having an input terminal coupled to receive the input signal and having an output terminal coupled to the buffer terminal. Responsive to the input signal being HIGH, the high-side buffer is configured to provide an I/O voltage at the buffer terminal. The receiver also includes an output stage coupled to the buffer terminal and having a low voltage terminal configured to receive a low supply voltage. The output stage is configured to provide an output signal responsive to the I/O voltage at the buffer terminal, wherein the output signal is lower than the I/O voltage.

Input buffer with wide range of I/O voltage level

In an embodiment, a system and method for supporting a seeding process with suspend and resume capabilities are described. A resumable seeding component in a data seeding module can be used to move data from a source tier to a target tier. A resumption context including a perfect hash function (PHF) and a perfect hash vector (PHV) persists a state of a seeding process at the end of each operation in the seeding process. The PHV represents data segments of the data using the PHF. The resumption context is loaded into memory upon resumption of the seeding process after it is suspended. Information in the resumable context is used to determine a last successfully completed operation, and a last copied container. The seeding process is resumed by executing an operation following the completed operation in the resumable context.

Method of efficiently migrating data from one tier to another with suspend and resume capability

An Inter-IC interface with a glitch filter including at least two cascaded RC filters configured to compensate a signal skew of the data or clock signal received from a data communication or clock signal line, feedback switches configured to pull up or pull down a voltage at an output node of each of the at least two cascaded RC filters, and feedforward transistors configured to condition a respective switches to the feedback switches to accelerate the pull up or the pull down.

Aspects of the present disclosure provide for a circuit. In at least some examples, the circuit includes a first diode, a second diode, a comparator having a comparator first arm and a comparator second arm, and an inverter. The first diode has a first terminal coupled to a first node and a second terminal. The second diode is coupled in series between the second terminal of the first diode and a second node. The comparator first arm includes a first plurality of transistor devices and is coupled to a third node. The comparator second arm includes a second plurality of transistor devices and is coupled to the second node, wherein the second plurality of transistor devices is greater in number than the first plurality of transistor devices. The inverter has an input coupled to the comparator and an output coupled to a fourth node.

Buffer Circuit

In general, embodiments of the invention relate to a method and system for managing persistent storage in a local computing device. More specifically, embodiments of the invention relate to determining the amount of space that will be freed up (or become available) in the persistent storage during a data transfer using a perfect hash function. Once the amount of data to be transferred is determined, embodiments of the invention initiate the allocation of an appropriate amount of space in the remote storage device and, subsequently, initiate the transfer of the data to the remote storage device.

Method and system to managing persistent storage using perfect hashing

A device includes a failsafe circuit having a supply node configured to couple to a supply voltage source, a pad node configured to couple to an input/output (I/O) pin, and a bulk node configured to couple to a bulk of a transistor coupled to the I/O pin. The failsafe circuit is configured to assert a failsafe indicator signal when the supply node voltage falls below the pad node voltage by a threshold voltage, and couple the higher of the supply node voltage and the pad node voltage to the bulk node. The device also includes a pull-down stack coupled to the failsafe circuit and to a ground node, and a sub-circuit configured to turn off the pull-down stack in response to the supply node discharging to the threshold voltage below the pad node voltage.

Failsafe device

A wide-voltage range, failsafe output interface module including a low-voltage, drain extended MOSFETs has been proposed to prevent the flow of reverse current during a failsafe operation while ensuring the MOSFETs are not subject to voltage over their voltage tolerance levels, improving reliability of an output interface module without resorting to more costly transistors with thicker films.

Failsafe, ultra-wide voltage input output interface using low-voltage gate oxide transistors

In an embodiment, a method for validating data integrity of a seeding process is described. The seeding process for migrating data from a source tier to a target tier persists a perfect hash vector (PHV) to a disk when the seeding process is suspended for various reasons. The PHV includes bits for fingerprints for data segments corresponding to the data, and can be reloaded into memory upon resumption of the seeding process. One or more bits corresponding to fingerprints for copied data segments are reset prior to starting the copy phase in the resumed run. A checksum of the PHV is calculated after the seeding process completes copying data segments in the containers. A non-zero checksum of the PHV indicates that one or more data segments are missing on the source tier or the data segments are not successfully copied to the target tier. The missing data segments and/or one or more related files are reported to a user via a user interface.

Method to check file data integrity and report inconsistencies with bulk data movement

An integrated circuit is disclosed. The integrated circuit includes input and output pads, a first integrated circuit portion having first circuitry, and a second integrated circuit portion having second circuitry different from the first circuitry. The first integrated circuit portion is configured to provide an input test signal from the input pad to the second integrated circuit portion, and provide an output test signal from the second integrated circuit portion to the output pad, the output test signal being generated by second integrated circuit portion in response to the input test signal.

Growing community of inventors

Bengaluru, India

Srikanth Srinivasan