Script operations, History operations, Other operations – HP StorageWorks XP Remote Web Console Software User Manual
Page 106: To clear all remote copy sims from the disk array, Optimizing truecopy operations and disk, Array performance
106 TrueCopy for the XP128/XP1024/XP10000/XP12000
NOTE:
Migration Copy and Restore Copy apply only to internal use. All other RIO statistics include both
TC390 and TC remote copy operations (async RIO count = TC390A RIOs + TCA RIOs). However,
Synchronization is not supported for this version.
Script Operations
At this time, exporting script trace files is not supported. For more information about the Script Operations
window, refer to ”
History Operations
At this time, exporting history files is not supported. For more information about the History window, refer
to ”
Other Operations
Click the Clear SIM button on the Other Operations window to clear all remote copy SIMs (service
information messages) from the connected disk array. Remote copy SIMs include all SIMs issued for TC390
and CA operations.
The clear SIM function is intended for use during disaster recovery operations, while switching operations
to the remote (secondary) backup site. Please see ”
Switching Operations to the Remote Site
for specific instructions on clearing remote copy SIMs during disaster recovery operations.
To clear all remote copy SIMs from the disk array:
1.
Click the Other Operations tab, and then click Clear SIM.
2.
From the Clear SIM confirmation window, click Yes to clear all remote copy SIMs from the connected
disk array, or click No to cancel your request to clear SIMs.
3.
If you clicked Yes, the disk array verifies that the existing SIMs are being cleared.
Optimizing TrueCopy Operations and Disk Array Performance
All TC390 operations result in increased utilization of the disk array’s channel resources because of the
additional write (remote copy) operations to the secondary volumes. The TC390 update copy mode
(synchronous or asynchronous) determines exactly how the remote copy operations will impact disk array
performance as follows:
•
Synchronous copy mode (TC390 Synchronous) has an additional effect on disk array performance:
increased service and disconnect time for write I/Os to TC390 M-VOLs due to the delay between
channel-end and device-end. The length of this delay increases as the distance between the M-VOL and
R-VOL increases so that the longest delay occurs when the main and remote volumes are the maximum
distance apart.
•
Asynchronous copy mode (TC390A) eliminates all delays associated with TC390 Synchronous
operations while providing increased protections for write-dependent applications in the event of a
disaster. Write I/Os for TC390A M-VOLs are processed in the same way as writes for simplex volumes,
Average response (ms)
Average response time (msec) for asynchronous update copy remote
I/Os.
Synchronization
Pair Synchronized (%)
Percent completion of the initial copy operation (number of synchronized
pairs / total number of pairs). For duplex TC390 Synchronous pairs, this
value is always 100% after the initial copy operation is complete.
Out of Sync Tracks
Number of tracks that have not yet been copied by the initial copy or
resync copy operation (this applies only when suspended during initial
copy or during resync copy).
Table 20
I/O statistics (continued)
Statistic
Description