HP StorageWorks XP Remote Web Console Software - Manual (Page 42)

42 TrueCopy for the XP128/XP1024/XP10000/XP12000
NOTE: For Fibre Channel interface, do not use the CESTPATH and CDELPATH commands at the
same time as the SCSI path definition function of LUN Management. The Fibre Channel interface
ports need to be configured as initiator ports or RCU target ports before the CESTPATH and
CDELPATH commands are issued.
CAUTION: Before issuing the CESTPATH command, verify that the relevant paths are offline from
the host(s) (for example, configure the Chipid offline, deactivate the LPAR, or block the port in the
ESCD). If any active logical paths still exist, the add path operation will fail because the port mode
(LCP/RCP) cannot be changed.
• You cannot use the PPRC commands to:
Change the RCU options. The current default values are: minimum paths = 1, max. initial copy activity
= 4, SCP delay time = 120 seconds, incident of RCU = to any host, PPRC support = yes, remote copy
service SIM = not report, RIO MIH Time = 15 seconds. The TC390 software must be used to change
these options.
Change the TC390 async options. The current default values are: sidefile threshold = 50%, offloading
timer = 5 minutes. The TC390 software must be used to change these options.
Configure TC390A consistency groups. Because each TC390A pair must belong to one group, the
TC390 software must be used to add and configure the groups (timer type, copy pending timeout, RCU
ready timeout) before you can add any TC390A pairs. After the asynchronous options, groups, and
group options are configured, the PPRC commands can be used to control/monitor TC390A pairs.
Change the initial copy priority. CFW data option, or DFW to R-VOL option. If CESTPAIR is used to
establish a TC390 pair, the following options will be used: initial copy priority = 0, CFW data = copy
to R-VOL, and DFW to R-VOL = not required. The TC390 software must be used to change these
options.
NOTE: By using Remote Copy Function Switch, you can set the following option with PPRC
command: CFW data = only M-VOL. If you want to use this function, please contact your HP
account support representative.
NOTE: The DFW to R-VOL setting does not affect the I/O performance of the M-VOLs. If one side of
cache is closed due to an RCU failure, the TC390 copy operation still uses DFW. The only difference
between not required and required is that new pairs cannot be established with the DFW-to-R-VOL
required option when one side of RCU cache is closed (the add pair operation fails).
P/DAS Support
TC390 Synchronous supports the IBM P/DAS host software function. You can use P/DAS to relocate or
migrate data by redirecting all application I/Os from the M-VOL of a TC390 pair to the R-VOL without
interrupting access to the data.TC390A does not support P/DAS SWAP.
Restrictions
• P/DAS does not support CFW operations. You must stop CFW applications before performing P/DAS
operations on TC390 volumes.
• P/DAS through channel extenders is not supported.
• P/DAS swap option #2 (switch pair and swap) is supported for P/DAS between the
XP128/XP1024/XP10000/XP12000 and other XP disk arrays.
Contact your HP account support representative for the latest information on P/DAS support.