HP StorageWorks XP24000 User Manual page 75

If you specify Slower, the pace of copying will be slow, but you can minimizes the impact of
SIz operations on storage system I/O performance. If you specify Faster, the copy operation
completes as quickly as possible, but it will cause a large impact on the I/O operation.
The Select Split Type list allows you to select the split type (from Quick Split or Steady Split)
for all the pairs that you are splitting.
Table 30 (page 75) lists read/write operations from the host servers to the volumes during
the split pair operation.
Table 30 Operations from the Host Servers during the Split Pair Operation
Operations Volumes
Read S-VOL
T-VOL
Write S-VOL
T-VOL
The Select T-VOL box allows you to filter the T-VOLs displayed in the T-VOL List on the right.
◦ The LDKC list allows you to select the LDKC of the T-VOL.
◦ The CU list allows you to select the CU image of the T-VOL.
Quick Split
Both areas which are not copied and areas which are already copied can
be read as usual.
The areas which are already copied
can be read as usual.
If the host server tries to read the
area which is not copied yet, firstly
ShadowImage for Mainframe copies
that area from the S-VOL, and then
the host server will read the area
after the copy operation completes.
Therefore, the result will be the same
as when the host server reads the
area which is already copied.
Write operation for the area which is already copied to the T-VOL is
performed normally.
If the host server tries to write data to the area which is not copied yet, new
data will be written after the old data is copied to the T-VOL. S-VOL data
during the split operation will therefore be copied to the T-VOL for sure.
The areas which are already copied
can be written as usual.
If the host server tries to write data
to the area which is not copied yet,
firstly ShadowImage for Mainframe
copies that area from the S-VOL,
and then the host server will write
data to the area after the copy
operation completes. Therefore, the
result will be the same as when the
host server writes data to the area
which is already copied.
Steady Split
Cannot be read. Read processing will
finish abnormally.
Cannot be written. Write processing
will finish abnormally.
Splitting Pairs 75