Truecopy Async/Universal Replicator Error State - Hitachi VSP F1500 User And Reference Manual

Storage
CCI system
state internal
state
Deleting N/A
Suspending N/A
PSUS PSUS PSUS
PFUS None
PSUE PSUE PSUE
PDUB PDUB PDUB
* If the host has more write I/Os in COPY state, then host write I/Os are delayed until there is enough
space in the sidefile.
Legend:
Bitmap: Host write data is managed via a cylinder BITMAP of delta data.
Normal: Host write data is not managed by BITMAP or sidefile.
Usual: Host side writing response is not delayed.
HWM (High Water Mark): Sidefile quantity is over 30% of cache storage.

TrueCopy Async/Universal Replicator error state

In the case of an ESCON or fibre-channel (FC) failure, the S-VOL FIFO queue
is missing a data block that was transferred from the P-VOL FIFO queue. The
RCU waits to store the next sequenced data block in the S-VOL FIFO queue
until the TrueCopy Async copy pending timeout occurs (defined using
TrueCopy). In addition, the timeout value can be specified at Device Manager
- Storage Navigator. The default value is set to 5 minutes. If the timeout
occurs during this waiting state, the pair status changes from PAIR to PSUE,
and non-sequenced data blocks are managed by the S-VOL bitmap. The
missing data block can be recovered using the pairresync command, which
merges the S-VOL bitmap with the P-VOL bitmap.
Async suspension condition on page 6-30
secondary side.
Description
TrueCopy
TrueCopy Async
Sync
Deleting from PAIR using
[pairsplit -S]
Suspending
from PAIR
Same
Timeout Over Threshold
Same (link down, etc.)
Same
Data replication operations with CCI
Command Control Interface User and Reference Guide
Writing control on TC
async volume
Writing
data
Normal
Using Via Bitmap Usual
[pairsplit ]
Timeout of
over threshold
Via Bitmap
Via Bitmap Usual
Via Bitmap
Via Bitmap
shows this situation on the
Transfer
data via
ESCON
Response
Usual Sidefile
Sidefile
Usual None
None
Usual None
Usual None
Figure 6-11 TrueCopy
6-29