HP StorageWorks XP Remote Web Console Software - Manual (Page 74)

indicates that the LDEV is a virtual volume used by XP Thin Provisioning (for example,
00:00:01X). For details regarding the external volumes, see the HP XP24000/XP20000
External Storage Software User Guide. For information about XP Thin Provisioning, see
the HP XP24000/XP20000 Thin Provisioning Software User Guide.
◦ Emulation: The emulation type of the P-VOL and S-VOL.
◦ Capacity(MB): The volume capacity displayed in megabytes (MB).
◦ CLPR(P): The cache logical partition of the P-VOL.
◦ CLPR(S): The cache logical partition of the S-VOL.
•
The Copy Pace list allows you to select the copy pace (from Slower, Medium, or Faster) for
all the pairs that you are splitting. By clicking Set, the same copy pace will be applied to all
the newly pairs that you are splitting.
◦ When the Preview List already holds some Pairsplit settings, and you specify a different
copy pace for new pairs in the Pairsplit dialog box, the copy pace for the existing Pairsplit
settings displayed in the Preview List will be also changed. The latest copy pace specified
in the Pairsplit dialog box is in effect before the settings are reflected to the storage system.
◦ If you specify Slower, the pace of copying will be slow, but you can minimize the impact
of XP Business Copy 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 MU list allows you to select the MU number for each pair being created from: 0,
1, and 2 for L1 pairs, and 1 and 2 for L2 pairs.
◦ You can select an MU number for a cascade pair. You cannot select the same MU number
for different cascade pairs of the same P-VOL (root or node volume).
◦ If you specify the MU number that is already used for XP Snapshot pair, or if you specify
MU number 0 for L2 pair, an error occurs.
•
The Select Split Type list allows you to select the pairsplit type from Quick Split or Steady Split.
Table 35 (page 74) shows read/write operations from the host servers to the volumes during
the pairsplit operation.
Table 35 Operations from the Host Servers during the Pairsplit Operation
Steady Split Quick Split Volumes Operations
Both areas that are not copied and areas that are already copied can be read
as usual. P-VOL Read
Cannot be read, though the
read processing itself will finish
normally. The areas that are already copied can be read
as usual.
If the host server tries to read the area that is
not copied yet, firstly XP Business Copy copies
S-VOL
that area from the P-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 that is already copied.
Write operation for the area that is already copied to the S-VOL is performed
normally. P-VOL Write
74 Performing XP Business Copy Operations