Target DASD controlled data migration move

Claim 3

The method of claim 1, further comprising the step of, concurrently with the copying steps, maintaining a copy progress map distinguishing items of data that have been copied from the source DASD to the target DASD from other items of data.

Claim 4

The method of claim 2, each item of data comprising a track of data stored on the source DASD.

Claim 5

The method of claim 2, the copy progress map comprising a bit map where each bit is associated with a different item of data in the source DASD, the maintaining step comprising the steps of setting each bit of the copy progress map to a predetermined value upon copying the associated data item to the target DASD.

Claim 6

The method of claim 4, the predetermined value being a binary zero.

Claim 7

The method of claim 4, the predetermined value being a binary one.

Claim 8

The method of claim 1, further including the steps of electrically decoupling the source DASD from the host.

Claim 9

The method of claim 1, the step of copying items of data stored in the source NVS comprising: copying a number of items of data stored in the source NVS to the target cache, and copying a number of items of data stored in the source NVS to the target NVS.

Claim 10

The method of claim 1, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, the steps performed in response to a host read request for data comprising the steps of: providing the requested data to the host from the target DASD if the requested data has already been copied from the source DASD, otherwise copying the requested data from the source DASD to the target cache and then providing the requested data to the host from the target cache.

Claim 11

The method of claim 1, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, the steps performed in response to a host request to write data comprising the steps of: writing the requested data from the host to the target cache if completion of the write request does not require data present in the source DASD but not present in the target DASD, otherwise copying the required data from the source DASD to the target cache and then writing the requested data from the host to the target cache.

Claim 12

The method of claim 1, the target DASD and source DASD being electrically coupled to a programmable interface that is electrically coupled to the host, the steps of electrically coupling the target DASD to the host and electrically coupling the source DASD to the target DASD comprising the steps of: re-programming the programmable interface to electrically couple the target DASD to the host; and re-programming the programmable interface to electrically couple the source DASD to the target DASD.

Claim 13

The method of claim 11, the programmable interface comprising an ESCON director.

Claim 14

The method of claim 1, the steps of electrically coupling the target DASD to the host and electrically coupling the source DASD to the target DASD comprising the steps of: placing a first communications link between the target DASD and the host; and placing a second communications link between the source DASD and the target DASD.

Claim 15

The method of claim 13, further comprising the steps of: removing any communications link between the source DASD and the host.

Claim 16

The method of claim 13, at least one of the first and second communications links comprising a fiber optic link.

Claim 17

The method of claim 13, at least one of the first and second communications links comprising a cable having an electrically conductive member.

Claim 18

The method of claim 1, the host comprising multiple digital processing apparatuses.

Claim 19

The method of claim 1, the host comprising a single digital processing apparatus.

Claim 20

The method of claim 1, the source DASD including multiple DASDs.

Claim 21

The method of claim 1, the target DASD including multiple DASDs.

Claim 24

The method of claim 21, further comprising the step of, concurrently with the copying steps, maintaining a copy progress map distinguishing items of data that have been copied from the source DASD to the target DASD from other items of data.

Claim 25

The method of claim 22, each item of data comprising a track of data stored on the source DASD.

Claim 26

The method of claim 22, the copy progress map comprising a bit map where each bit is associated with a different item of data in the source DASD, the maintaining step comprising the steps of setting each bit of the copy progress map to a predetermined value upon copying the associated data item to the target DASD.

Claim 27

The method of claim 24, the predetermined value being a binary zero.

Claim 28

The method of claim 24, the predetermined value being a binary one.

Claim 29

The method of claim 21, further including the steps of electrically decoupling the source DASD from the host.

Claim 30

The method of claim 21, the step of copying items of data stored in the source NVS comprising: copying a number of items of data stored in the source NVS to the target cache, and copying a number of items of data stored in the source NVS to the target NVS.

Claim 31

The method of claim 21, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, the steps performed in response to a host read request for data comprising the steps of: providing the requested data to the host from the target DASD if the requested data has already been copied from the source DASD, otherwise copying the requested data from the source DASD to the target cache and then providing the requested data to the host from the target cache.

Claim 32

The method of claim 21, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, the steps performed in response to a host request to write data comprising the steps of: writing the requested data from the host to the target cache if completion of the write request does not require data present in the source DASD but not present in the target DASD, otherwise copying the required data from the source DASD to the target cache and then writing the requested data from the host to the target cache.

Claim 33

The method of claim 21, the host comprising multiple digital processing apparatuses.

Claim 34

The method of claim 21, the host comprising a single digital processing apparatus.

Claim 35

The method of claim 21, the source DASD including multiple DASDs.

Claim 36

The method of claim 21, the target DASD including multiple DASDs.

Claim 39

An article of manufacture comprising a data storage medium tangibly embodying a program of machine-readable instructions executable by a digital processing apparatus to perform method steps for migrating data from a source DASD to a target DASD, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, said method steps comprising: directing requests for access of data contained on the source DASD to the target DASD; copying data stored in the source DASD to the target DASD by: copying items of data stored in the source cache to the target cache; and separately copying items of data stored in the source NVS to the target NVS; concurrently with the copying steps, operating the target DASD to receive from the host data access requests and in response to said receipt to satisfy the data access requests by performing steps comprising: in response to a host read request for data, providing the requested data to the host from the target DASD if the requested data has already been copied from the source DASD, otherwise copying the requested data from the source DASD to the target DASD and then providing the requested data to the host from the target DASD; and in response to a host request to write data, writing the requested data from the host to the target DASD if completion of the write request does not require data present in the source DASD but not yet present in the target DASD, otherwise copying the required data from the source DASD to the target DASD and then writing the requested data from the host to the target DASD.

Claim 40

An article of manufacture comprising a data storage medium tangibly embodying a program of machine-readable instructions executable by a digital processing apparatus to perform method steps for migrating data from a source DASD to a target DASD, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, said method steps comprising: directing requests for access of data contained on the source DASD to the target DASD; copying data stored in the source DASD to the target DASD by: copying items of data stored in the source cache to the target cache; and separately copying items of data stored in the source NVS to the target NVS; concurrently with the copying steps, operating the target DASD to receive from the host data access requests and in response to said receipt to satisfy the data access requests by performing steps comprising: in response to a host read request for data, providing the requested data to the host from the target DASD if the requested data has already been copied from the source DASD, otherwise copying the requested data from the source DASD to the target DASD and then providing the requested data to the host from the target DASD; and in response to a host request to write data, writing the requested data from the host to the target DASD if completion of the write request does not require data present in the source DASD but not yet present in the target DASD, otherwise copying the required data from the source DASD to the target DASD and then writing the requested data from the host to the target DASD.

Claim 41

The article of claim 36, further comprising the step of, concurrently with the copying steps, maintaining a copy progress map distinguishing items of data that have been copied from the source DASD to the target DASD from other items of data.

Claim 42

The article of claim 37, each item of data comprising a track of data stored on the source DASD.

Claim 43

The article of claim 37, the copy progress map comprising a bit map where each bit is associated with a different item of data in the source DASD, the maintaining step comprising the steps of setting each bit of the copy progress map to a predetermined value upon copying the associated data item to the target DASD.

Claim 44

The article of claim 39, the predetermined value being a binary zero.

Claim 45

The article of claim 39, the predetermined value being a binary one.

Claim 46

The article of claim 36, further including the steps of electrically decoupling the source DASD from the host.

Claim 47

The article of claim 36, the step of copying items of data stored in the source NVS comprising copying a number of items of data stored in the source NVS to the target cache, and copying a number of items of data stored in the source NVS to the target NVS.

Claim 48

The article of claim 36, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, the steps performed in response to a host read request for data comprising the steps of: providing the requested data to the host from the target DASD if the requested data has already been copied from the source DASD, otherwise copying the requested data from the source DASD to the target cache and then providing the requested data to the host from the target cache.

Claim 49

The article of claim 36 the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, the steps performed in response to a host request to write data comprising the steps of: writing the requested data from the host to the target cache if completion of the write request does not require data present in the source DASD but not present in the target DASD, otherwise copying the required data from the source DASD to the target cache and then writing the requested data from the host to the target cache.

Claim 50

The article of claim 36, the host comprising multiple digital processing apparatuses.

Claim 51

The article of claim 36, the host comprising a single digital processing apparatus.

Claim 52

The article of claim 36, the source DASD including multiple DASDs.

Claim 53

The article of claim 36, the target DASD including multiple DASDs.

Claim 54

An article of manufacture comprising a data storage medium tangibly embodying a program of machine-readable instructions executable by a digital processing apparatus to perform method steps for migrating data from a source DASD to a target DASD, the target DASD being coupled to the host and the source DASD being coupled to the target DASD, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, said method steps comprising: receiving an identification of data items contained on the source DASD to be copied to the target DASD; creating a copy progress map including a listing of each identified data item, the copy progress map including for each data item an indicator denoting whether that data item has been copied from the source DASD to the target DASD; redirecting requests for access of data contained on the source DASD to the target DASD; operating the target DASD to repeatedly perform the following steps until all data items have been copied to the target DASD: selecting a data item whose indicator denotes that said data item has not been copied from the source DASD to the target DASD; reading the selected data item from the source DASD; copying the selected data item to the target DASD by copying data stored in the source cache to the target cache and separately copying data stored in the source NVS to the target NVS; changing the indicator of the data item to denote that said data item has been copied from the source DASD to the target DASD; satisfying any host data access requests received during the operating step by performing steps comprising: in response to a host request to read a data item, providing the data item to the host from the target DASD if the data item has already been copied from the source DASD, otherwise, copying the data item from the source DASD to the target DASD, providing the data item to the host from the target cache, and changing indicators corresponding to the copied data item to denote that said data item has been copied from the source DASD to the target DASD; and in response to a host request to write a data item from the host to the target DASD, writing the data item to the target DASD if completion of the write request does not require any data items present in the source DASD but not yet present in the target DASD, otherwise copying the required data items from the source DASD to the target DASD and then writing data from the host to the target DASD and changing indicators corresponding to the copied data items to denote that said data items have been copied from the source DASD to the target DASD.

Claim 55

An article of manufacture comprising a data storage medium tangibly embodying a program of machine-readable instructions executable by a digital processing apparatus to perform method steps for migrating data from a source DASD to a target DASD, the target DASD being coupled to the host and the source DASD being coupled to the target DASD, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, said method steps comprising: receiving an identification of data items contained on the source DASD to be copied to the target DASD; creating a copy progress map including a listing of each identified data item, the copy progress map including for each data item an indicator denoting whether that data item has been copied from the source DASD to the target DASD; redirecting requests for access of data contained on the source DASD to the target DASD; operating the target DASD to repeatedly perform the following steps until all data items have been copied to the target DASD: selecting a data item whose indicator denotes that said data item has not been copied from the source DASD to the target DASD; reading the selected data item from the source DASD; copying the selected data item to the target DASD by copying data stored in the source cache to the target cache and separately copying data stored in the source NVS to the target NVS; changing the indicator of the data item to denote that said data item has been copied from the source DASD to the target DASD; satisfying any host data access requests received during the operating step by performing steps comprising: in response to a host request to read a data item, providing the data item to the host from the target DASD if the data item has already been copied from the source DASD, otherwise, copying the data item from the source DASD to the target DASD, providing the data item to the host from the target cache, and changing indicators corresponding to the copied data item to denote that said data item has been copied from the source DASD to the target DASD; and in response to a host request to write a data item from the host to the target DASD, writing the data item to the target DASD if completion of the write request does not require any data items present in the source DASD but not yet present in the target DASD, otherwise copying the required data items from the source DASD to the target DASD and then writing data from the host to the target DASD and changing indicators corresponding to the copied data items to denote that said data items have been copied from the source DASD to the target DASD.

Claim 56

A data storage subsystem, comprising: a host; a source DASD, the source DASD including a source cache and a source non-volatile storage ("NVS"); a target DASD electrically coupled to the host and the source DASD, the target DASD including a target cache and target NVS, the target DASD being programmed for: directing requests for access of data contained on the source DASD to the target DASD; copying data stored in the source DASD to the target DASD by: copying items of data stored in the source cache to the target cache; and separately copying items of data stored in the source NVS to the target NVS; concurrently with the copying steps, operating the target DASD to receive from the host data access requests for access to data stored in the source DASD and in response to said receipt to satisfy the data access requests by performing steps comprising: in response to a host read request for data, providing the requested data to the host from the target DASD if the requested data has already been copied from the source DASD, otherwise copying the requested data from the source DASD to the target DASD and then providing the requested data to the host from the target DASD; and in response to a host request to write data, writing the requested data from the host to the target DASD if completion of the write request does not require data present in the source DASD but not present in the target DASD, otherwise copying the required data from the source DASD to the target DASD and then writing the requested data from the host to the target DASD.

Claim 57

A data storage subsystem, comprising: a host; a source DASD, the source DASD including a source cache and a source non-volatile storage ("NVS"); a target DASD electrically coupled to the host and the source DASD, the target DASD including a target cache and target NVS, the target DASD being programmed for: directing requests for access of data contained on the source DASD to the target DASD; copying data stored in the source DASD to the target DASD by: copying items of data stored in the source cache to the target cache; and separately copying items of data stored in the source NVS to the target NVS; concurrently with the copying steps, operating the target DASD to receive from the host data access requests for access to data stored in the source DASD and in response to said receipt to satisfy the data access requests by performing steps comprising: in response to a host read request for data, providing the requested data to the host from the target DASD if the requested data has already been copied from the source DASD, otherwise copying the requested data from the source DASD to the target DASD and then providing the requested data to the host from the target DASD; and in response to a host request to write data, writing the requested data from the host to the target DASD if completion of the write request does not require data present in the source DASD but not present in the target DASD, otherwise copying the required data from the source DASD to the target DASD and then writing the requested data from the host to the target DASD.

Claim 58

The subsystem of claim 51, further comprising the step of, concurrently with the copying steps, maintaining a copy progress map distinguishing items of data that have been copied from the source DASD to the target DASD from other items of data.

Claim 59

The subsystem of claim 52, each item of data comprising a track of data stored on the source DASD.

Claim 60

The subsystem of claim 52, the copy progress map comprising a bit map where each bit is associated with a different item of data in the source DASD, the maintaining step comprising the steps of setting each bit of the copy progress map to a predetermined value upon copying the associated data item to the target DASD.

Claim 61

The subsystem of claim 54, the predetermined value being a binary zero.

Claim 62

The subsystem of claim 54, the predetermined value being a binary one.

Claim 63

The subsystem of claim 51, further including the steps of electrically decoupling the source DASD from the host.

Claim 64

The subsystem of claim 51, the step of copying items of data stored in the source NVS comprising copying a number of items of data stored in the source NVS to the target cache, and copying a number of items of data stored in the source NVS to the target NVS.

Claim 65

The subsystem of claim 51, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, the steps performed in response to a host read request for data comprising the steps of: providing the requested data to the host from the target DASD if the requested data has already been copied from the source DASD, otherwise copying the requested data from the source DASD to the target cache and then providing the requested data to the host from the target cache.

Claim 66

The subsystem of claim 51, the source DASD including a source cache and a source non-volatile storage ("NVS"), the target DASD including a target cache and target NVS, the steps performed in response to a host request to write data comprising the steps of: writing the requested data from the host to the target cache if completion of the write request does not require data present in the source DASD but not present in the target DASD, otherwise copying the required data from the source DASD to the target cache and then writing the requested data from the host to the target cache.

Claim 67

The subsystem of claim 51, the host comprising multiple digital processing apparatuses.

Claim 68

The subsystem of claim 51, the host comprising a single digital processing apparatus.

Claim 69

The subsystem of claim 51, the source DASD including multiple DASDs.

Claim 70

The subsystem of claim 51, the target DASD including multiple DASDs.

Claim 71

The subsystem of claim 51, the target DASD and host being electrically coupled via a programmable interface, the target DASD and the source DASD also being electrically coupled via the programmable interface.

Claim 72

The subsystem of claim 65, the programmable interface comprising an ESCON director.

Claim 73

The subsystem of claim 51, the target DASD and host being electrically coupled via a first communications link, and the target DASD and the source DASD being electrically coupled via a second communications link.

Claim 74

The subsystem of claim 67 at least one of the first and second communications links comprising a fiber optic link.

Claim 75

The subsystem of claim 67, at least one of the first and second communications links comprising a cable having an electrically conductive member.

Claim 76

A data storage subsystem, comprising: a host; a source DASD, the source DASD including a source cache and a source non-volatile storage ("NVS"); a target DASD coupled to the host and the source DASD, the target DASD including a target cache and target NVS, the target DASD being programmed for: receiving an identification of data items contained on the source DASD to be copied to the target DASD; creating a copy progress map including a listing of each identified data item, the copy progress map including for each data item an indicator denoting whether that data item has been copied from the source DASD to the target DASD; redirecting requests for access of data contained on the source DASD to the target DASD; operating the target DASD to repeatedly perform the following steps until all data items have been copied to the target DASD: selecting a data item whose indicator denotes that said data item has not been copied from the source DASD to the target DASD; reading the selected data item from the source DASD; copying the selected data item to the target DASD by copying data stored in the source cache to the target cache and separately copying data stored in the source NVS to the target NVS; changing the indicator of the data item to denote that said data item has been copied from the source DASD to the target DASD; satisfying any host data access requests received during the operating step by performing steps comprising: in response to a host request to read a data item, providing the data item to the host from the target DASD if the data item has already been copied from the source DASD, otherwise, copying the data item from the source DASD to the target DASD, providing the data item to the host from the target cache, and changing an indicators corresponding to the copied data item to denote that said data item has been copied from the source DASD to the target DASD, and in response to a host request to write a data item from the host to the target DASD, writing the data item to the target DASD if completion of the write request does not require any data items present in the source DASD but not present in the target DASD, otherwise copying the required data from the source DASD to the target DASD and then writing data from the host to the target DASD and changing indicators corresponding to the copied data items to denote that said data items have been copied from the source DASD to the target DASD.

Claim 77

A data storage subsystem, comprising: a host; a source DASD, the source DASD including a source cache and a source non-volatile storage ("NVS"); a target DASD coupled to the host and the source DASD, the target DASD including a target cache and target NVS, the target DASD being programmed for: receiving an identification of data items contained on the source DASD to be copied to the target DASD; creating a copy progress map including a listing of each identified data item, the copy progress map including for each data item an indicator denoting whether that data item has been copied from the source DASD to the target DASD; redirecting requests for access of data contained on the source DASD to the target DASD; operating the target DASD to repeatedly perform the following steps until all data items have been copied to the target DASD: selecting a data item whose indicator denotes that said data item has not been copied from the source DASD to the target DASD; reading the selected data item from the source DASD; copying the selected data item to the target DASD by copying data stored in the source cache to the target cache and separately copying data stored in the source NVS to the target NVS; changing the indicator of the data item to denote that said data item has been copied from the source DASD to the target DASD; satisfying any host data access requests received during the operating step by performing steps comprising: in response to a host request to read a data item, providing the data item to the host from the target DASD if the data item has already been copied from the source DASD, otherwise, copying the data item from the source DASD to the target DASD, providing the data item to the host from the target cache, and changing an indicators corresponding to the copied data item to denote that said data item has been copied from the source DASD to the target DASD, and in response to a host request to write a data item from the host to the target DASD, writing the data item to the target DASD if completion of the write request does not require any data items present in the source DASD but not present in the target DASD, otherwise copying the required data from the source DASD to the target DASD and then writing data from the host to the target DASD and changing indicators corresponding to the copied data items to denote that said data items have been copied from the source DASD to the target DASD.