The performance of applications at the local cluster can
be limited by the performance of the storage systems at the remote
cluster.
Your set up must meet the following requirements to maximize
the amount of I/O operations that applications can run on Global Mirror
VDisks:
- The Global Mirror VDisks at the remote cluster must be in dedicated
MDisk groups that only contain other Global Mirror VDisks.
- Configure storage systems to support the Global Mirror workload
that is required of them. The following guidelines can be used to
fulfill this requirement:
- Dedicate storage systems to only Global Mirror VDisks
- Configure the storage system to guarantee sufficient quality of
service for the disks that are being used by Global Mirror operations
- Ensure that physical disks are not shared between Global Mirror
VDisks and other I/O operations. For example, do not split an individual
RAID array.
- For Global Mirror MDisk groups, use MDisks with the same characteristics.
For example, use MDisks that have the same RAID level, physical disk
count, and disk speed. This requirement is important to maintain performance
when you use the Global Mirror feature.
You must provision the storage systems that are attached
to the remote cluster to accommodate the following:
- The peak application workload to the Global Mirror VDisks
- The specified background copy level
- All I/O operations that run on the remote cluster