Kristal T Pollack

US Patent:

8103824, Jan 24, 2012

Filed:

Apr 17, 2008

Appl. No.:

12/105245

Inventors:

Kristal Pollack - San Francisco CA, US
Elizabeth Richards - Columbia MD, US
Sandeep Uttamchandani - San Jose CA, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 12/00
G06F 13/00
G06F 13/28

US Classification:

711114, 714 2

Abstract:

A method, apparatus, and article of manufacture are provided to support dynamic assignment of data from a continuous stream of data to one or more storage devices in a storage network. The storage network is configured with one or more tiers in a hierarchy, with at least one storage device in each tier. Similarly, the storage network is in communication with both a storage manager and a data manager. The storage manager sorts the storage devices, maintains a demand function of each device, and calculates a burn rate for each storage device. The data manager is in communication with the storage manager and assigns data from the received stream of data to at least one of the storage devices.

US Patent:

20080195369, Aug 14, 2008

Filed:

Feb 13, 2007

Appl. No.:

11/674198

Inventors:

Linda M. Duyanovich - Saratoga CA, US
Kristal T. Pollack - San Francisco CA, US
Elizabeth S. Richards - Columbia MD, US
Sandeep M. Uttamchandani - San Jose CA, US

International Classification:

G06F 9/455
G06F 17/18
G06F 15/00

US Classification:

703 22, 702183, 702179

Abstract:

Disclosed are system and method embodiments for determining the root-causes of a performance objective violation, such as an end-to-end service level objection (SLO) violation, in a large-scale system with multi-tiered applications. This determination is made using a hybrid of component-level snapshots of the state of the system during a period in which an abnormal event occurred (i.e., black box mapping) and of known events and their causes (i.e., white-box mapping). Specifically, in response to a query about a violation (e.g., why did the response time for application a increase from r to r), a processor will access and correlate the black-box and white-box mappings to determine a short-list of probable causes for the violation.