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The suspending and deleting states are temporary internal states within the
RAID storage system. CCI cannot detect these transition states, because
these states are reported on the previous state of the storage system. These
states are therefore concealed inside the
pairsplit
command. After the
pairsplit
command is accepted, host write I/Os for the P-VOL are managed
by the cylinder bitmap (normal), non-transmitted data remaining in the P-
VOL's FIFO queue is transferred to the S-VOL's FIFO queue, and the pair
status is then set to PSUS [SMPL] state when all data in the P-VOL's FIFO
queue has been transmitted.
PFUL.
If the quantity of data in sidefile cache exceeds 30% of cache storage,
the internal status of the RAID storage system is PFUL, and host write I/Os
receive delayed response in the range of 0.5 seconds (minimum) to 4
seconds (maximum).
PFUS.
If the quantity of data in sidefile cache exceeds the user-defined
sidefile area (30%-70%), then host write I/Os must wait for enough sidefile
space to become available for storing the next new write data. If a copy
pending timeout occurs during this waiting state, then the pair status
changes from PAIR to PFUS, host write I/Os are accepted, and write data is
managed by bitmap.
The CCI software can detect and report the PFUL and PFUS states as follows:
•
As a return code of the
pairvolchk
command
•
As the status code displayed to code item by the
pairmon
command
•
As the paired status displayed to status item using -fc option of
pairdisplay
command
Table 6-8 State table for TrueCopy vs. TrueCopy Async
CCI
state
Storage
system
internal
state
Description
Writing control on TC
async volume
Transfer
data via
ESCON
TrueCopy
Sync
TrueCopy Async
Writing
data
Response
SMPL SMPL
SMPL
Same
Normal
Usual
None
COPY COPY
COPY
Same
Via Sidefile
Usual*
Sidefile
& bitmap
Deleting
N/A
Deleting from COPY using
[pairsplit -S]
Normal
Usual
Sidefile
Suspending N/A
Suspending from COPY by
using [pairsplit]
Via Bitmap
Usual
Sidefile
PAIR
PAIR
Synchronized
Async
sidefile in
use
Less than HWM Via Sidefile
Usual
Sidefile
PFUL
N/A
HWM to
Threshold
Via Sidefile
Delayed
Sidefile
Over
Threshold
Via Sidefile
Wait until
under
threshold
Sidefile
6-28
Data replication operations with CCI
Command Control Interface User and Reference Guide
Содержание HUS VM
Страница 10: ...x Command Control Interface User and Reference Guide ...
Страница 18: ...xviii Preface Command Control Interface User and Reference Guide ...
Страница 78: ...2 50 CCI software environment Command Control Interface User and Reference Guide ...
Страница 154: ...4 8 Starting up CCI Command Control Interface User and Reference Guide ...
Страница 191: ...Provisioning operations with CCI 5 37 Command Control Interface User and Reference Guide ...
Страница 277: ... 1 UR 2x2 Data replication operations with CCI 6 53 Command Control Interface User and Reference Guide ...
Страница 280: ...6 56 Data replication operations with CCI Command Control Interface User and Reference Guide ...
Страница 286: ...6 62 Data replication operations with CCI Command Control Interface User and Reference Guide ...
Страница 302: ...7 16 Data protection operations with CCI Command Control Interface User and Reference Guide ...
Страница 324: ...8 22 Examples of using CCI commands Command Control Interface User and Reference Guide ...
Страница 524: ...9 200 Troubleshooting Command Control Interface User and Reference Guide ...
Страница 529: ...Command Control Interface User and Reference Guide ...