HP P9000 for Compatible FlashCopy Mirroring User Guide (AV400-96388, October 2011)

Operating Pools
Operating when Pool is full
Even if a pool becomes full, the data that is updated in the S-VOL can reflect to T-VOL if THP pages
are allocated to TSE-VOL.
When performing the operation to update the S-VOL in the state of no space on pages, the copying
of corresponding data to T-VOL fails and the relationship will be in the Failed State, results that
the Read and Write process for T-VOL is not available. To restore from Failed State, the relationship
is needed to be released.
Even if the pool is in the state of 100% used (area becomes insufficient), it is available to create
a relationship where the T-VOL is TSE-VOL. However, when Write process is done to the source
for the relationship of this status, the relationship will be in the Failed State.
Managing Failed State
Because of running short the physical capacity of a pool that is allocated to TSE-VOL, data reflection
to the FC T-VOL before updating fails, maintaining the consistency with FC S-VOL fails, with the
results that the FC relationship will be in the Failed State. Once the FC relationship becomes Failed
State, the Read/Write process performed by T-VOL will not be available until the relationship is
released. Read/Write process of S-VOL is available, but the process is not copied to T-VOL.
Warning of Pool Capacity by Host
When the usage capacity of a pool that is associated with TSE-VOL has exceeded the threshold
value that is set by the user, a warning message is issued for the mainframe host.
Example:
• [WARNING] threshold value set by the user is 70% and when the pool usage capacity has
exceeded it
REPOSITORY VOLUME WARNING: AT 30% CAPACITY REMAINING
• [EXHAUSTION] threshold value set by the user is 80% and when the pool usage capacity has
exceeded it
REPOSITORY VOLUME WARNING: AT 20% CAPACITY REMAINING
• A message that indicates insufficient of area when the pool usage capacity has reached 100%
REPOSITORY VOLUME EXHAUSTED
The above message is issued regardless of FCSE relationships when I/O operation is performed
to the TSE single VOL.
Establishing Compatible FlashCopy SE relationships
You need to use the FCESTABL command of PPRC TSO commands, DFSMSdss commands,
ICKDSF commands, or ANTRQST Macro commands, to establish Compatible FlashCopy SE
relationships.
Establishing Compatible FlashCopy relationships by Volumes using TSO
command
The following shows the procedures with the FCESTABL command when you establish Compatible
FlashCopy SE relationships by volumes.
1. Specify FCSETGTOK(YES) parameter and MODE(NOCOPY) parameter, and then execute
the FCESTABL command. EXTENTS, XTNTLST, or XXTNTLST parameter cannot be specified at
this time.
90 Performing Compatible FlashCopy SE operations