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Caution:
The SVOL-takeover operation is required to copy Nontransmitted P-
VOL data within a given timeout value (specified by the -t <timeout> option).
If the timeout occurs (before the SVOL-takeover operation has completed all
S-VOL changes to a SSWS state), the horctakeover command will fail with
EX_EWSTOT. If the horctakeover has failed due to a timeout then you need
to try for a recovery as shown below.
•
Wait until the S-VOL state becomes SSWS' via pairdisplay -g <group> -l -
fc command, and try to the start-up again for the HA Control Script.
•
Make an attempt to re-synchronize the original P-VOL based on the S-VOL
using pairresync -g <group> -swaps -c <size> for a Fast Failback
operation.
If this operation fails with [EX_CMDRJE] or [EX_CMDIOE], this is due to a
FICON link down or site failure. After a recovery from the failure, perform
the operation again.
Therefore this timeout value should be a greater than (or equal) to the start-
up timeout value for the MC & CC Control Script.
PVOL-takeover function
A PVOL-takeover relinquishes the pair state for a volume or group in order to
make the P-VOL writable following some type of error (for example, link down
with DATA fence). This function makes it so the takeover node alone can use
the primary volume (that is, reading and writing are enabled), on the
assumption that the remote node (possessing the secondary volume) cannot
be used.
The PVOL-takeover function has two functions: PVOL-PSUE-takeover, and
PVOL-SMPL-takeover. A PVOL-PSUE-takeover forces the primary volume to
suspend (PSUE, PSUS) state which permits WRITEs to all primary volumes of
the group (even if the fence level is data). Therefore PSUE and/or PSUS are
intermingled in the volume group through the action of this PVOL-PSUE-
takeover. This intermingled pair status creates PSUE as the group status,
therefore the pairvolchk command results give precedence to PSUE (PDUB)
status over PSUS for the group.
This special state returns back to its original state by issuing the pairresync
command. A PVOL-SMPL-takeover forces the primary volume to simplex
(SMPL) state so the pair is destroyed. At first, PVOL-takeover executes PVOL-
PSUE-takeover. If PVOL-PSUE-takeover fails, it then executes PVOL-SMPL-
takeover. PVOL-takeover can be specified per paired logical volume or per
volume group.
TrueCopy Async/Universal Replicator specific behavior for PVOL-
takeover:
PVOL-takeover will not be executed. It will become a Nop-
Takeover, since the fence level will be Async which is equal to Never so it is
not needed to allow P-VOL writes.
TrueCopy remote commands
Figure 6-7 TrueCopy remote system configuration on page 6-16
TrueCopy remote configuration. The CCI TrueCopy remote commands assist
Data replication operations with CCI
6-15
Command Control Interface User and Reference Guide
Summary of Contents for HUS VM
Page 10: ...x Command Control Interface User and Reference Guide ...
Page 18: ...xviii Preface Command Control Interface User and Reference Guide ...
Page 78: ...2 50 CCI software environment Command Control Interface User and Reference Guide ...
Page 154: ...4 8 Starting up CCI Command Control Interface User and Reference Guide ...
Page 191: ...Provisioning operations with CCI 5 37 Command Control Interface User and Reference Guide ...
Page 280: ...6 56 Data replication operations with CCI Command Control Interface User and Reference Guide ...
Page 286: ...6 62 Data replication operations with CCI Command Control Interface User and Reference Guide ...
Page 302: ...7 16 Data protection operations with CCI Command Control Interface User and Reference Guide ...
Page 324: ...8 22 Examples of using CCI commands Command Control Interface User and Reference Guide ...
Page 524: ...9 200 Troubleshooting Command Control Interface User and Reference Guide ...
Page 529: ...Command Control Interface User and Reference Guide ...