HP XP P9500 Storage - Manual (Page 18)

Table 2 Comparison of results of Cnt Ac-S Z pair operations
If differential data of the Cnt Ac-S Z
pair are stored in units of cylinders If differential data of the Cnt Ac-S
Z pair are stored in units of tracks Comparison Item
No Yes Is it possible to use Cnt Ac-S Z pair volumes that are
not suspended to create FC Z relationships?
Yes. However, you cannot
resynchronize a Cnt Ac-S Z pair Yes Is it possible to use suspended Cnt Ac-S Z pair volumes
to create FC Z relationships?
when a volume in the Cnt Ac-S Z
pair is also used as a FC Z volume.
No Yes Is it possible to use FC Z relationships to create Cnt
Ac-S Z pairs?
No Yes Will background copy be performed if a FC Z
relationship has been created in NOCOPY mode?
When the FC Z relationship is
copied in units of tracks. When the FC Z relationship is
created. When will differential data of the Cnt Ac-S Z pair be
updated?
Transition of Pair Synchronized is different depending
on whether the data were stored in units of tracks or
cylinders.
Remote Compatible FlashCopy function
The Remote Compatible FlashCopy function enables you to perform operations on Compatible
FlashCopy relationships on the Cnt Ac-S Z remote storage system from the host connected to the
Cnt Ac-S Z main storage system. This function cannot be used for Compatible FlashCopy SE pairs.
The Remote Compatible FlashCopy operation proceeds in the following order:
•
First, you issue a Compatible FlashCopy operation command to the Cnt Ac-S Z M-VOL.
•
Then, the command is transmitted from the Main Control Unit (MCU) to the Remote Control
Unit (RCU).
•
Finally, the storage system identifies the Cnt Ac-S Z R-VOL as a Compatible FlashCopy S-VOL
and performs a Remote Compatible FlashCopy operation on the Compatible FlashCopy V2
relationships (for example, it creates a relationship, releases a relationship, and displays
information about a relationship).
However, you cannot perform the Remote Compatible FlashCopy function in the following cases:
•
The Compatible FlashCopy operation command is not issued to the Cnt Ac-S Z M-VOL.
•
The S-VOL is not the Cnt Ac-S Z R-VOL.
•
An extent is specified when you establish a relationship. You cannot use extents to establish
a relationship for a dataset copying.
•
The Cnt Ac-S Z R-VOL is in Simplex status.
•
The Cnt Ac-S Z R-VOL is in Pending duplex status.
•
The Cnt Ac-S Z R-VOL is in Duplex, Suspend, or SSWS status and the Cnt Ac-S Z M-VOL is in
Simplex, or Pending duplex status.
•
The specified T-VOL is a TSE-VOL. You cannot establish Compatible FlashCopy SE relationships
by using the Remote Compatible FlashCopy function.
NOTE: If the Compatible FlashCopy SE license is not installed in the local site, only the remote-site
Compatible FlashCopy SE relationships are released. The TSE-VOL area specified as the T-VOL
cannot be released when relationships are released using the Remote Compatible FlashCopy
function in the mode used to release allocated areas.
The following figure shows the Remote Compatible FlashCopy function.
18 About Compatible FlashCopy operations