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EMC Symmetrix DMX-3 Product Guide
Data Integrity, Availability, and Protection
Dynamic
reconfigurations
Symmetrix systems support dynamic reconfiguration activity
without disruption to online applications such as:
â—† Establish/de-establish mirrored pairs
â—† Add/reallocate hypervolumes
â—† Modify channel assignments or change emulation modes
Note: Modification to channel assignments without disruption to online
applications can occur only if the application has an alternate path to the
data.
Nondisruptively
change or remove
FBA devices
This feature nondisruptively allows an FBA open systems device to
be changed or deleted online regardless of the type of data protection,
with the exception of spare drives. This feature uses the same
mechanisms as other online configuration changes to ensure no
impacts.
Deleting (and then
adding) devices
online
Enginuity supports removing and then adding devices online, which
facilitates the following configuration enhancements:
◆ Change Device Emulation Online—Remove a CKD volume and
add an FBA volume.
â—† Convert between mirrored and RAID protected volumes.
â—† The optimal order is to delete devices and then add. If done in the
reverse order, unnecessary global memory will be allocated for
the deleted devices.
â—† When attempting to add or delete devices, or change protection
type of devices, a new minimum cache value will be calculated.
In rare cases this new value could prohibit the changes until
additional memory is added to the system.
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