Preventing damage to storage devices within a storage system due to movement of the storage system

• US 9,349,399 B2
• Filed: 05/28/2015
• Issued: 05/24/2016
• Est. Priority Date: 05/14/2013
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Farkas, Sandor, Ahmed, Syed S.
• Primary Examiner(s): Rossiter, Sean D
• Application Number:
  US14/724,768
• Publication Number:
  US 20150262601A1
• Time in Patent Office: 362 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G11B 17/228 Control systems for magazines G11B17/225 takes precedence
• CPC Class Codes: G11B 19/042 due to external shock or vibration
• CPC Class Codes: G11B 5/5582 system adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock

Abstract

A method implemented in a storage system that has moveable storage devices includes a motion controller receiving movement related data of a storage device from at least one sensor associated with the storage device. In response to the received movement related data indicating at least one pre-identified condition, a park command is issued that triggers the reading head of the storage device to enter a parked state in which the storage device is protected from damage that can occur due to motion of the reading head while the pre-identified condition exists.

Claims

1. In a storage system having moveable storage devices, a method comprising:

a motion controller receiving movement related data of a storage device from at least one sensor associated with the storage device;

wherein the storage device and the motion controller are mounted on a translating sled, which is configured for movement between a first end of travel position and a second end of travel position and the method further comprises monitoring movement of the translating sled between the first end of travel position and the second end of travel position to generate the movement related data; and

in response to the received movement related data indicating at least one pre-identified condition, issuing a park command that triggers the reading head of the storage device to enter a parked state in which the storage device is protected from damage that can occur due to mechanical motion of the reading head while the pre-identified condition exists;

wherein the motion controller includes a motion sensor and a position sensor and is communicatively coupled to the motion sensor and the position sensor such that the motion controller receives acceleration data and position data that corresponds to movement of the translating sled.

2. The method of claim 1, wherein the movement related data includes acceleration data and the method further comprises:

an acceleration sensor detecting an acceleration of the storage device, generating the acceleration data of the storage device and transmitting the acceleration data to the motion controller;

determining if the received acceleration data is greater than a maximum acceleration threshold; and

in response to the received acceleration data being greater than the maximum acceleration threshold, issuing the park command that triggers the reading head of the storage device to enter the parked state.

3. The method of claim 1, further comprising:

accumulating total distance and velocity within a distance accumulator and a velocity accumulator;

determining if the storage device is at an end of travel position; and

in response to the storage device being at the end of travel position, clearing the respective distance accumulator and velocity accumulator of an accumulated total travel distance and velocity.

4. In a storage system having moveable storage devices, a method comprising:

a motion controller receiving movement data of a storage device from at least one sensor associated with the storage device, wherein the movement data includes position data;

a position sensor detecting a position of the storage device, generating the position data of the storage device and transmitting the position data to the motion controller;

determining a velocity of the storage device from the received movement data;

calculating a critical distance to reach an end of travel position for the storage device based on the velocity and the position data;

determining if the storage device can safely decelerate prior to reaching the end of travel position; and

in response to the storage device not being able to safely decelerate prior to reaching the end of travel position, issuing a park command that triggers a reading head of the storage device to enter a parked state in which the storage device is protected from damage that can occur due to mechanical motion of the reading head while the pre-identified condition exists.

5. The method of claim 4, further comprising:

calculating a change in velocity and a change in distance for the storage device from the received movement data;

calculating a total velocity for the storage device;

determining if the total velocity is greater than a maximum total velocity threshold; and

in response to the total velocity being greater than the maximum total velocity threshold, issuing the park command that triggers the storage device to enter the parked state.

6. A storage system comprising:

at least one storage device;

a storage controller communicatively coupled to the at least one storage device for controlling operations of the storage system;

at least one sensor that tracks and records movement related data corresponding to movement of the storage device; and

a motion controller coupled to the at least one sensor and which comprises logic that;

receives the movement related data from the at least one sensor; and

in response to the received movement related data indicating at least one pre-identified condition, issues a park command that triggers the reading head of the storage device to enter a parked state in which the storage device is protected from damage that can occur due to mechanical motion of the read/write head while the pre-identified condition exists;

wherein the storage device and the motion controller are mounted on a translating sled, which is configured for movement along a rail, between a first end of travel position and a second end of travel position and the method further comprises monitoring movement of the translating sled between the first end of travel position and the second end of travel position to generate the movement related data;

wherein the motion controller includes a motion sensor and a position sensor and is communicatively coupled to the motion sensor and the position sensor such that the motion controller receives acceleration data and position data that corresponds to movement of the translating sled; and

wherein the motion controller is communicatively coupled to a storage controller and issuing of the park command comprises signaling the storage controller to issue the park command to the storage device.

7. The storage system of claim 6, wherein the movement related data includes acceleration data and the motion controller further comprises logic that:

detects an acceleration of the storage device;

generates the acceleration data of the storage device;

transmits the acceleration data to the motion controller;

determines if the received acceleration data is greater than a maximum acceleration threshold; and

in response to the received acceleration data being greater than the maximum acceleration threshold, issues the park command that triggers the reading head of the storage device to enter the parked state.

8. The storage system of claim 6, wherein the movement related data includes position data and the motion controller further comprises logic that:

generates the position data of the storage device and transmits the position data to the motion controller;

determines a velocity of the storage device from the received movement data;

determines if the storage device can safely decelerate prior to reaching the end of travel position; and

in response to the storage device not being able to safely decelerate prior to reaching the end of travel position, issues the park command that triggers the storage device to enter the parked state.

9. The storage system of claim 8, wherein in determining if the storage device can safely decelerate the logic further calculates a critical distance to reach an end of travel position for the storage device based on the velocity and the position data.

10. The storage system of claim 6, wherein the motion controller further comprises logic that:

calculates a change in velocity and a change in distance for the storage device from the received movement data;

calculates a total velocity for the storage device;

determines if the total velocity is greater than a maximum total velocity threshold; and

in response to the total velocity being greater than the maximum total velocity threshold, issues the park command that triggers the storage device to enter the parked state.

11. The storage system of claim 6, wherein the motion controller further comprises logic that:

accumulates total distance and velocity within a distance accumulator and a velocity accumulator;

determines if the storage device is at an end of travel position; and

in response to the storage device being at the end of travel position, clears the respective distance accumulator and velocity accumulator of an accumulated total travel distance and velocity.

12. An information handling system (IHS) comprising:

one or more processors;

a storage system coupled to the processor and in communication with the processor, the storage system comprising at least one storage device and a storage controller coupled to the storage device for controlling operations of the storage system;

at least one sensor that tracks and records movement related data corresponding to movement of the storage device;

a motion controller communicatively coupled to the at least one sensor, the motion controller having firmware executing thereon to provide control of storage device operations, wherein the firmware configures the motion controller to;

determine if received movement-related data indicates at least one pre-identified condition that can result in damage to the storage device; and

in response to the received movement related data indicating at least one pre-identified condition, issue a park command that triggers the reading head of the storage device to enter a parked state in which the storage device is protected from damage that can occur due to mechanical motion of the reading head while the pre-identified condition exists;

wherein the storage device and the motion controller are mounted on a translating sled, which is configured for movement along a rail between a first end of travel position and a second end of travel position and the method further comprises monitoring movement of the translating sled between the first end of travel position and the second end of travel position to generate the movement related data; and

wherein the motion controller includes a motion sensor and a position sensor and is communicatively coupled to the motion sensor and the position sensor such that the motion controller receives acceleration data and position data that corresponds to movement of the translating sled.

13. The IHS of claim 12, wherein the motion controller is communicatively coupled to a storage controller and issuing of the park command comprises signaling the storage controller to issue the park command to the storage device.

14. The information handling system of claim 12, wherein the movement related data includes acceleration data and the firmware further configures the motion controller to:

detect an acceleration of the storage device;

generate the acceleration data of the storage device;

transmit the acceleration data to the motion controller;

determine if the received acceleration data is greater than a maximum acceleration threshold; and

in response to the received acceleration data being greater than the maximum acceleration threshold, issue the park command that triggers the reading head of the storage device to enter the parked state.

15. The IHS of claim 12, wherein the firmware further configures the motion controller to:

calculate a change in velocity and a change in distance for the storage device from the received movement data;

determine a total velocity for the storage device;

determine if the total velocity is greater than a maximum total velocity threshold;

in response to the total velocity being greater than the maximum total velocity threshold, issue the park command that triggers the storage device to enter the parked state; and

save the movement data.

16. The information handling system of claim 12, wherein the firmware further configures the motion controller to:

accumulate total distance and velocity within a distance accumulator and a velocity accumulator;

determine if the storage device is at an end of travel position; and

in response to the storage device being at the end of travel position, clear the respective distance accumulator and velocity accumulator of an accumulated total travel distance and velocity.