1. A method implemented in a cloud computing environment comprised of a first storage server and a second storage server, the method comprising:
copying, a virtual logical unit that stores learning metadata, from the first storage server to the second storage server, wherein the learning metadata indicates a type of storage device in which data of the first storage server is stored;
copying logical units corresponding to the data from the first storage server to the second storage server; and
using the learning metadata to place a selected data in the type of storage device indicated by the learning metadata, subsequent to the copying of the logical units and subsequent to the copying of the virtual logical unit.
2. The method of claim 1, wherein a copy services command synchronizes the learning metadata across storage servers prior to the copying of the logical units corresponding to the data from the first storage server to the second storage server.
3. The method of claim 1, wherein the learning metadata additionally indicates how the selected data is physically placed in different storage areas of the type of storage device indicated by the learning metadata.
4. The method of claim 3, wherein the learning metadata also indicates constraints on read and write access times for the selected data, and wherein while placing the selected data in the type of storage device indicated by the learning metadata, the selected data is also placed in a manner such that the constraints on the read and write access times are satisfied.
5. The method of claim 1, wherein
a synchronous copy services command allows copying of selected logical units from one storage server to another; and
the virtual logical volume that stores the learning metadata is not accessible to customers that store customer data in the first and the second storage servers.
6. A system, comprising:
a cloud computing environment comprising a first storage server and a second storage server, wherein operations performed in the cloud computing environment comprise:
copying, a virtual logical unit that stores learning metadata, from the first storage server to the second storage server, wherein the learning metadata indicates a type of storage device in which data of the first storage server is stored;
copying logical units corresponding to the data from the first storage server to the second storage server; and
using the learning metadata to place a selected data in the type of storage device indicated by the learning metadata, subsequent to the copying of the logical units and subsequent to the copying of the virtual logical unit.
7. The system of claim 6, wherein a copy services command synchronizes the learning metadata across storage servers prior to the copying of the logical units corresponding to the data from the first storage server to the second storage server.
8. The system of claim 6, wherein the learning metadata additionally indicates how the selected data is physically placed in different storage areas of the type of storage device indicated by the learning metadata.
9. The system of claim 8, wherein the learning metadata also indicates constraints on read and write access times for the selected data, and wherein while placing the selected data in the type of storage device indicated by the learning metadata, the selected data is also placed in a manner such that the constraints on the read and write access times are satisfied.
10. The system of claim 6, wherein
a synchronous copy services command allows copying of selected logical units from one storage server to another; and
the virtual logical volume that stores the learning metadata is not accessible to customers that store customer data in the first and the second storage servers.
11. A computer program product for a cloud computing environment comprised of a first storage server and a second storage server, the computer program product comprising:
a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code configured to perform operations that are executed by a processor, the operations comprising:
copying, a virtual logical unit that stores learning metadata, from the first storage server to the second storage server, wherein the learning metadata indicates a type of storage device in which data of the first storage server is stored;
copying logical units corresponding to the data from the first storage server to the second storage server; and
using the learning metadata to place a selected data in the type of storage device indicated by the learning metadata, subsequent to the copying of the logical units and subsequent to the copying of the virtual logical unit.
12. The computer program product of claim 11, wherein a copy services command synchronizes the learning metadata across storage servers prior to the copying of the logical units corresponding to the data from the first storage server to the second storage server.
13. The computer program product of claim 11, wherein the learning metadata additionally indicates how the selected data is physically placed in different storage areas of the type of storage device indicated by the learning metadata.
14. The computer program product of claim 13, wherein the learning metadata also indicates constraints on read and write access times for the selected data, and wherein while placing the selected data in the type of storage device indicated by the learning metadata, the selected data is also placed in a manner such that the constraints on the read and write access times are satisfied.
15. The computer program product of claim 11, wherein
a synchronous copy services command allows copying of selected logical units from one storage server to another; and
the virtual logical volume that stores the learning metadata is not accessible to customers that store customer data in the first and the second storage servers.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for operating an electrophoretic display apparatus, the electrophoretic display apparatus including:
a first substrate;
a second substrate;
an electrophoretic device being held between the first substrate and the second substrate and containing electrophoretic particles;
a first electrode formed on a surface of the first substrate, the surface facing the electrophoretic device; and
a second electrode formed on a surface of the second substrate, the surface facing the electrophoretic device, the method comprising:
image displaying in which a voltage is applied to the electrophoretic device, the image displaying including
device driving in which the electrophoretic device is driven by inputting a first potential into the first electrode and inputting a second potential into the second electrode, and
accumulated-charge removing in which a potential of the first electrode is changed, from the first potential to the second potential, stepwise or uniformly at a potential change velocity lower than a potential change velocity upon starting of the device driving,
wherein, in the accumulated-charge removing, the potential change velocity for the first electrode is in a region represented by Expression (1) below:
ve\u2266|V1\u2212V2|\u03c4\u2003\u2003(1)
where ve represents the potential change velocity for the first electrode, V1 represents the first potential, V2 represents the second potential, and \u03c4 represents a time constant of the electrophoretic device.
2. The method according to claim 1, wherein, in the accumulated-charge removing, the potential change velocity for the first electrode is set to a maximum value of a range in which self-erasing of the electrophoretic device does not occur.
3. The method according to claim 1, wherein, in the accumulated-charge removing, driving signals having a waveform for changing the potential of the first electrode at a constant velocity are input into the first electrode.
4. The method according to claim 1,
wherein the electrophoretic display apparatus further includes a transistor on the first substrate, the transistor including a drain terminal connected to the first electrode, and
wherein, in the accumulated-charge removing, selection signals having a waveform for changing the potential of the first electrode at a constant velocity are input into a gate terminal of the transistor.
5. The method according to claim 1, wherein, the image displaying further includes temperature correcting in which the potential change velocity for the first electrode in the accumulated-charge removing is corrected in accordance with environmental temperature, the temperature correcting being performed prior to the accumulated-charge removing.
6. An electrophoretic display apparatus comprising:
a first substrate;
a second substrate;
an electrophoretic device being held between the first substrate and the second substrate and containing electrophoretic particles;
a first electrode formed on a surface of the first substrate, the surface facing the electrophoretic device;
a second electrode formed on a surface of the second substrate, the surface facing the electrophoretic device; and
a voltage control section that applies a driving voltage to the electrophoretic device,
wherein the voltage control section is configured to drive the electrophoretic device to display an image by conducting
a device driving operation in which the electrophoretic device is driven by inputting a first potential into the first electrode and inputting a second potential into the second electrode, and
an accumulated-charge removing operation in which a potential of the first electrode is changed, from the first potential to the second potential, stepwise or uniformly at a potential change velocity lower than a potential change velocity upon starting of the device driving operation,
wherein, in the accumulated-charge removing operation, the potential change velocity for the first electrode is in a region represented by Expression (1) below:
ve\u2266|V1\u2212V2|\u03c4\u2003\u2003(1)
where ve represents the potential change velocity for the first electrode V1 represents the first potential, V2 represents the second potential, and \u03c4 represents a time constant of the electrophoretic device.
7. An electronic system comprising the electrophoretic display apparatus according to claim 6.