US6415372B1 — Rolling back storage subsystem reconfigurations

Claim 1

Independent Claim 59 words

A method of reconfiguring a storage subsystem, comprising: performing a first ordered sequence of reconfigurations of physical volumes of the storage subsystem; and then, performing a portion of the reconfigurations in a second ordered sequence in response to receiving a rollback request, the order of the second sequence being reversed with respect to the order of the first sequence.

Claim 2

Independent Claim 59 words

A method of reconfiguring a storage subsystem, comprising: performing a first ordered sequence of reconfigurations of physical volumes of the storage subsystem; and then, performing a portion of the reconfigurations in a second ordered sequence in response to receiving a rollback request, the order of the second sequence being reversed with respect to the order of the first sequence.

Claim 3

Dependent Claim 19 words

The method of claim 1 , wherein each reconfiguration is a swap of a pair of physical storage volumes.

Claim 4

Dependent Claim 42 words

The method of claim 1 , further comprising: reading a portion of a file, the file listing the first ordered sequence of performed reconfigurations; and wherein the reconfigurations performed in second ordered sequence are identified in the read portion of the file.

Claim 5

Dependent Claim 20 words

The method of claim 3 , further comprising: making a first list of previously performed swaps from the read portion.

Claim 6

Dependent Claim 37 words

The method of claim 4 , further comprising: forming a second list of swaps by removing pairs of identical swaps from the first list; and wherein the performing a portion executes the swaps on the second list.

Claim 7

Dependent Claim 26 words

The method of claim 2 , wherein the performing a portion reconfigures the storage subsystem to a configuration existing prior to completing the sequence of reconfigurations.

Claim 8

Independent Claim 49 words

A method of reconfiguring a storage subsystem, comprising: performing a series of swaps of physical storage volumes of the subsystem; recording each swap in a list in response to performing the swap; reading a portion of the list; and undoing a portion of the swaps read from the list.

Claim 9

Independent Claim 49 words

A method of reconfiguring a storage subsystem, comprising: performing a series of swaps of physical storage volumes of the subsystem; recording each swap in a list in response to performing the swap; reading a portion of the list; and undoing a portion of the swaps read from the list.

Claim 10

Dependent Claim 25 words

The method of claim 7 , wherein the undoing reconfigures the physical storage volumes to a configuration existing prior to completing the series of swaps.

Claim 11

Dependent Claim 29 words

The method of claim 7 , wherein the act of undoing includes performing the portion of the swaps in an order that is reversed with respect to the series.

Claim 12

Dependent Claim 41 words

The method of claim 7 , wherein the act of undoing comprises: creating a second list for the portion of the swaps by removing pairs of entries from the first list, each member of a pair corresponding to the same swap.

Claim 13

Dependent Claim 21 words

The method of claim 10 , wherein the removed entries are adjacent entries on a list derived from the first list.

Claim 14

Dependent Claim 45 words

A data storage device storing a computer executable program of instructions for reconfiguring a storage subsystem, the instructions to cause the computer to: perform a series of at least three swaps of physical storage volumes, the swaps having been previously performed in a reversed order.

Claim 15

Dependent Claim 45 words

A data storage device storing a computer executable program of instructions for reconfiguring a storage subsystem, the instructions to cause the computer to: perform a series of at least three swaps of physical storage volumes, the swaps having been previously performed in a reversed order.

Claim 16

Dependent Claim 27 words

The device of claim 12 , the instructions to further cause the computer to: read a portion of a file, the file listing previously performed swaps sequentially.

Claim 17

Dependent Claim 25 words

The device of claim 13 , the instructions further causing the computer to: make a list of swaps from the read portion of the file.

Claim 18

Dependent Claim 51 words

The device of claim 14 , the instructions further causing the computer to: form a second list of swaps by removing adjacent pairs of identical swaps from the first list; and wherein the instructions to perform a series of swaps causes the computer to execute the swaps on the second list.

Claim 19

Dependent Claim 30 words

The device of claim 12 , wherein the instructions to perform a series of swaps cause the computer to return the configuration of the storage subsystem to an earlier configuration.

Claim 20

Dependent Claim 53 words

A data storage device storing a computer readable object, the object comprising: a list identifying a plurality of entries, each entry identifying a swap performed on pairs of physical storage volumes of a storage subsystem and a time at which the swap was performed, the list being sequential with respect to the times.

Claim 21

Dependent Claim 53 words

A data storage device storing a computer readable object, the object comprising: a list identifying a plurality of entries, each entry identifying a swap performed on pairs of physical storage volumes of a storage subsystem and a time at which the swap was performed, the list being sequential with respect to the times.

Claim 22

Dependent Claim 26 words

The data storage device of claim 17 , wherein each pair of sequential entries of the list corresponds to swaps between different pairs of storage volumes.

Claim 23

Independent Claim 52 words

An apparatus, comprising: a storage subsystem having a plurality of physical storage volumes; and a computer capable of reconfiguring the storage subsystem by performing a sequence of swaps of storage volumes and of rolling back the storage subsystem to an earlier configuration by performing a portion of the swaps in reversed order.

Claim 24

Independent Claim 52 words

An apparatus, comprising: a storage subsystem having a plurality of physical storage volumes; and a computer capable of reconfiguring the storage subsystem by performing a sequence of swaps of storage volumes and of rolling back the storage subsystem to an earlier configuration by performing a portion of the swaps in reversed order.

Claim 25

Dependent Claim 42 words

The apparatus of claim 19 , wherein the computer is configured to perform the roll back in response to receiving a selected time, the portion of the swaps of the sequence being performed being limited to swaps performed after the selected time.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2005-07-01	2005-12-31	2006-07-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2009-07-01	2009-12-31	2010-07-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2013-07-01	2013-12-31	2014-07-02	$7700.00	Window Closed / Lapsed

Rolling back storage subsystem reconfigurations

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