HP XP Racks - Manual (Page 283)

Replication Manager can also be used to monitor asynchronous remote copying performed using
Continuous Access Asynchronous or Continuous Access Journal. Write delay time or consistency time
delta (C/T delta) can be monitored to acquire transfer delay status from volume replication facilities.
You can display the transfer delay state between the primary and secondary volumes for each copy
group.
This module describes methods for monitoring performance of remote copies:
• About performance monitoring , page 283
• Checking the performance of remote copies , page 283
• Monitoring transfer delay state of remote copies , page 284
• Monitoring resource utilization (pools and journal groups) , page 286
About performance monitoring
Performance monitoring is available when the system uses asynchronous remote copy functionality,
such as Continuous Access Asynchronous or Continuous Access Journal, or copy functionality based
on snapshot images, such as Snapshot.
The following table summarizes the types of information available to find out if the target copy group
is maintaining the predefined performance level.
You can check the usage of the following buffers:
• When using Continuous Access Asynchronous: sidefiles, which are stored in cache
memory areas of the storage system to which the primary and secondary volumes belong
• When using Continuous Access Journal: journal volumes that correspond to the primary
and secondary volumes
• When using Snapshot in open systems: pool volumes for storing the differential data
used to create snapshot images (virtual volumes)
Buffer usage
You can check the time required to write data of the primary volume to the secondary volume
based on the write delay time.
Write delay
time (C/T
delta)
To view the workflow for checking the performance of remote copies, see “ Checking performance
workflow (remote copies) ” on page 284.
If necessary, you can export the performance history to a CSV or HTML file. (Note that you can export
only data whose retention period has not expired.)
Related topics
• About exporting management information , page 423
Checking the performance of remote copies
TIP:
You can check the performance of remote copies when system operation uses asynchronous remote
copy functionality. See “
About performance monitoring ” on page 283 for more information.
For details on how to check performance of remote copies, see the following:
• “ Checking buffer usage (pools and journal groups) ” on page 286.
• “ Checking buffer usage (sidefiles and journal volumes) ” on page 287.
User Guide 283