HP StorageWorks P9000 Reference Manual page 38

Option
-cto <o-time>
[c-time] [r-time]
38 Replication commands
Description
Continuous Access Asynchronous and Continuous Access Journal only.
These options are valid for only HORC Async/Cnt Ac-J, if you will specify "-cto <o-time> [c-time]
[r-time]" option on HORC sync, then it is ignored.
o-time:This option is used when setting "offloading timer" for controlling Inflow of Write I/O to the
specified CT group. For HORC Async, o-time must be specified within the limits of 255 from 1, in
units of sec as value. If this option is not specified, then "90" seconds is set as default. For Cnt Ac-J,
o-time must be specified within the limits of 600 from 1, in units of sec as value. If this option is not
specified, then "60" seconds is set as default. If "o-time=0" is specified, then sets as "OFF" that does
not control Inflow. If Sidefile quantity is over limit of Sidefile Area then host side Write I/O is waited
for enough space of Sidefile when storing next new write data until this timeout value (1 second to
255(600) seconds). Default timeout value are 90(60)seconds. If the timeout happens with this waiting
state then pair state is changed from "PAIR" to "PFUS" state of sidefile(Journal) Full, and its host side
Write I/O is continued and Writing data is managed by BITMAP mode. Therefore o-time timeout
value should have less a low value than I/O timeout value of the host system.
[c-time]: (Applicable for only HORC Async) This option is used when setting "Copy Pending timer"
to the specified CT group. c-time must be specified within the limits of 15 from 1, in units of min as
value. If this option is not specified, then this value is set as below. - If CT group is created, then sets
5 minutes as default, if not, it is not changed.
[r-time]: (Applicable for only HORC Async) This option is used when specifying "RCU Ready timer"
to the specified CT group. r-time must be specified within the limits of 10 from 1, in units of min as
value. If this option is not specified, then it is not changed.
NOTE:
These options will also be able to set, if all volumes of CT group is suspended.
The propagation and persistence of these parameters are as follows.
For HORC Async, these parameters are also forwarded to S-VOL side with pairresync command,
and are used when S-VOL is changed to P-VOL. These parameters are maintained until the pair-volumes
are changed to SMPL.
For Cnt Ac-J, these parameters are maintained on each journal, therefore it must be set for P-VOL
and S-VOL. For example to change 30 seconds for P-VOL:
- pairsplit -g Cnt Ac-J - pairresync -g Cnt Ac-J -cto 30
For changing a journal of S-VOL side, the above operation must be issued after changed from S-VOL
to P-VOL. These parameters are maintained until the journal are broken.
Continuous Access Asynchronous and Continuous Access Journal only.
-f[g] <fence> [CTGID] (Continuous Access Synchronous only): This option is used to change from
existing Cnt Ac-S Sync volumes to Cnt Ac-S Sync CTG without deleting paired-volume. It is possible
to change the option(fence level) and the volume attribute as follows. This option is valid without
"-swaps" or "-swapp" option.
Attribute -f fence -fg fence -fg fence CTGID
----------------------------------------------------------------------------
HORC_Sync Updates fence Cmd rejected Changes to HORC Sync CTG
Abnormal term. Updates fence (Note 1)
----------------------------------------------------------------------------
HORC_Sync CTG Changes to HORC Updates fence Cmd rejected
Updates sync Abnormal term.
----------------------------------------------------------------------------
HORC_Async Cmd rejected Cmd rejected Cmd rejected
Abnormal term. Abnormal term. Abnormal term.
Explanation of terms:
fence: fence means "data", "status", or "never" ("async" cannot be specified).
Cmd rejected/Abnormal term.: Command execution is rejected and the operation terminates
abnormally.
Note 1: If the identical CTGID is specified with the different group name of RAID Manager, then
the command is rejected. So different CTGID must be specified for the different group name.