HP XP Business Copy Software - Manual (Page 69)

XP24000/XP20000 External Storage Software User Guide. For information about XP
Thin Provisioning, see the HP StorageWorks XP24000/XP20000 Thin Provisioning
Software User Guide.
◦ MU: The MU number of the P-VOL.
◦ Status: The status of the P-VOL.
◦ S-VOL: Information about S-VOL displays in AAA-BB-CCC(XX:YY:ZZ) format.
AAA: Port ID (cluster and channel number) –
– BB: Group number of host group
– CCC: LU number
– XX:YY:ZZ: LDKC number:CU number:LDEV number
An LDEV number that ends with a pound or gate symbol (#) indicates that the LDEV is an
external volume (for example, 00:00:01#). An LDEV number that ends with a letter X
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 StorageWorks
XP24000/XP20000 External Storage Software User Guide. For information about XP
Thin Provisioning, see the HP StorageWorks 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 pairs being created. By clicking the Set button, the same copy pace will be applied to all
the new pairs being created.
◦ When the Preview List already holds some Paircreate settings, and you specify a different
copy pace for new pairs in the Paircreate dialog box, the copy pace for the existing
Paircreate settings displayed in the Preview List will be also changed. The latest copy
pace specified in the Paircreate dialog box is in effect before the settings are reflected
to the storage system.
◦ If you specify Slower, the pace of initial copying will be slow, but you can minimizes the
impact of XP Business Copy operations on storage system I/O performance. If you specify
Faster, the initial 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.
◦ When a P-VOL makes a pair with more than one S-VOL, the storage system assumes that
there are the same number of virtual P-VOLs. For example, when a P-VOL makes pair
with three S-VOLs, there is only one real P-VOL but the storage system assumes that there
are three virtual P-VOLs. Virtual P-VOL is called MU (Mirror Unit).
◦ 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.
Creating Pairs 69