Systems and methods for tracking portions of a logical...

Details Systems and methods for tracking portions of a logical... Systems and methods for tracking portions of a logical...

2011-08-23

2011-08-23

Ellis, Kevin L (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S145000, C707S999204, C714S006130

Reexamination Certificate

active

08006052

ABSTRACT:
Embodiments of the invention exploit the fact that not all portions of a logical volume may include data written by a host. Accordingly, an embodiment of the invention includes setting a designated set of bits to 1 in a meta data table when a logical volume is initialized. These bits may be referred to herein as Never Written by Host (NWBH) bits. Separately, or in combination, an embodiment of the invention includes setting a NWBH bit to 0 when data is written to the associated portion of the logical volume. Separately, or in combination, an embodiment of the invention includes reading the NWBH bit upon receiving a read command associated with the associated portion of the logical volume. If the NWBH bit is equal to 1, data is not read from the associated portion of the logical volume; if the NWBH bit is equal to 0, data is read from the associated portion of the logical volume.

REFERENCES:
patent: 6574709 (2003-06-01), Skazinski et al.
patent: 7149859 (2006-12-01), Fujibayashi
patent: 2005/0071589 (2005-03-01), Tross et al.
patent: 2005/0091391 (2005-04-01), Burton et al.
patent: 2006/0253670 (2006-11-01), Zohar et al.
patent: 2006/0253681 (2006-11-01), Zohar et al.
patent: 2006/0253683 (2006-11-01), Zohar et al.

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