HP StorageWorks XP Remote Web Console Software User Manual
Page 132
132 Hitachi TrueCopy z/OS for HP XP12000/XP10000 and SVS 200 storage systems
NOTE:
When you set the several pairs at once and you want to keep some of the individual settings,
leave the parameter box blank. Then, only the parameters you enter are available.
Use the Suspend Pair window to select the Suspend Pair options for the pair(s):
•
Volume: Device ID of M-VOL.
NOTE:
If # is added to the end of an LDEV number, such as 00:3F#, the LDEV is an external
volume. For more information about external volumes, see the HP StorageWorks XP External
Storage user guide for the XP12000/XP10000 disk array.
•
SSB [F/M = FB]: When this option is enabled (and PPRC Support = Yes), the MCU will notify all
attached hosts (IEA494I message) that the pair was suspended. This option should always be enabled.
NOTE:
If PPRC support = No, the x’FB’ sense information will not be reported to the host, even if
the SSB (F/M = FB) suspend option is enabled.
•
Suspend Kind: This option specifies the suspend type of the selected pair(s). The default setting is
R-VOL.
• M-VOL Failure. This setting can be used only for TC390 Synchronous pairs. The MCU will reject all
write I/O operations to the M-VOL while the pair is suspended, regardless of the fence level setting.
Use this setting if you need to maintain synchronization of the TC390 pair. This setting is functionally
equivalent to CSUSPEND with the optional PRIMARY parameter (without QUIESCE).
• R-VOL. The M-VOL will accept all subsequent write I/O operations and the MCU will keep track of
updates while the pair is suspended. Use this setting if you need to keep the M-VOL online. This
setting is functionally equivalent to CSUSPEND without the optional PRIMARY parameter.
•
Asynchronous Parameters:
• Suspend Range: Use this option to select the TC390A suspend group operation. The CSUSPEND
TSO command supports the TC390A suspend group operation (see ”
Group. The MCU/RCU will suspend all other TC390A pairs in the same consistency group as the
specified pair(s).
Volume. The MCU/RCU will suspend only the specified TC390A pair(s) (even if the error level of the
pair is group).
NOTE:
With the setting of Volume for Suspend Range, if there are Duplex status pairs and pairs
other than Duplex status in the same consistency group, unexpected suspend may occur during the
pair operations (Suspend, Delete, and Resume) under the heavy I/O load conditions. You can
estimate whether the I/O load condition is heavy or not from the rate of sidefile cache (around
30%), or from the frequency of the host I/O if you cannot see the rate of sidefile cache. The pair
operations should be performed under the light I/O load condition.
• Pending Update: This option specifies the TC390A suspend mode. The CSUSPEND TSO command
supports the TC390A suspend mode option (”
Using PPRC commands for TrueCopy
Drain. The RCU will finish settling all pending recordsets for the pair as soon as the RCU accepts
the suspend operation. After settling all the recordsets, if there is no recordset for a fixed period of
time, the MCU will change the TC390A pair status from suspending to suspended.