Methods and apparatus for time-based dynamically adjusted journaling
First Claim
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1. A data center for data backup and replication, comprising:
- a pool of multiple variable-size storage units for storing a journal of I/O write commands issued at respective times, wherein the journal spans a history window of a pre-specified time length, wherein the variable-size storage units comprise variable-size data chunks corresponding to a window of time, and wherein the pool of storage units is not dedicated to the journal; and
a journal manager for dynamically allocating more variable-size data chunks of the variable-size storage units for storing the journal as the journal size increases, and for dynamically releasing variable-size data chunks of the variable-size storage units as the journal size decreases.
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Abstract
A data center for data backup and replication, including a pool of multiple storage units for storing a journal of I/O write commands issued at respective times, wherein the journal spans a history window of a pre-specified time length, and a journal manager for dynamically allocating more storage units for storing the journal as the journal size increases, and for dynamically releasing storage units as the journal size decreases.
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Citations
12 Claims
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1. A data center for data backup and replication, comprising:
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a pool of multiple variable-size storage units for storing a journal of I/O write commands issued at respective times, wherein the journal spans a history window of a pre-specified time length, wherein the variable-size storage units comprise variable-size data chunks corresponding to a window of time, and wherein the pool of storage units is not dedicated to the journal; and a journal manager for dynamically allocating more variable-size data chunks of the variable-size storage units for storing the journal as the journal size increases, and for dynamically releasing variable-size data chunks of the variable-size storage units as the journal size decreases. - View Dependent Claims (2, 3, 4, 5)
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6. A computer-based method for a data center, comprising:
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receiving, by a computer at a sequence of times, new data to add to a journal, the journal comprising one or more allocated variable-size data chunks corresponding to a window of time from variable-size storage resources from a pool of resources that are not dedicated to the journal, and wherein journal data is stored in the allocated variable-size data chunks and promoted from time to time to a recovery disk; determining, by the computer, if the journal already contains data for an entire pre-designated time history; additionally determining, by the computer, if the addition of the new data to the journal would cause the journal to exceed a pre-designated maximum size; further determining, by the computer, if the additional of the new data to the journal requires allocating an additional variable-sized data chunk to the journal; when said further determining is affirmative, then yet further determining, by the computer, if the pool of resources has a free variable-sized data chunk available; when said determining or said additionally determining or said yet further determining is affirmative, then; promoting, by the computer, old time data from the journal to a recovery disk; removing, by the computer, the old time data from the journal; and releasing, by the computer, one or more of the variable-size data chunks from the journal, if all of the data from the one or more variable-size data chunks was promoted to the recovery disk; when said further determining is affirmative, then allocating, by the computer, an additional variable-sized data chunk to the journal; and adding, by the computer, the new data to the journal. - View Dependent Claims (7, 8, 9)
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10. A method of data backup and replication, comprising:
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accessing a pool of multiple variable-size storage units for storing a journal of I/O write commands issued at respective times, wherein the journal spans a history window of a pre-specified time length, wherein the variable-size storage units comprise variable-size data chunks corresponding to a window of time, and wherein the pool of storage units is not dedicated to the journal; dynamically allocating more variable-size data chunks from the pool of multiple variable-size storage units for storing the journal as the journal size increases; and dynamically releasing variable-size data chunks from the pool of multiple variable-size storage units as the journal size decreases. - View Dependent Claims (11, 12)
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Specification