Rebalance When VxFlex OS detects lopsided use of storage capacity, or when new nodes are
added, it redistributes data across the nodes, in order to improve performance.
Rebuild When VxFlex OS detects a failure in the network, it creates a new copy of the data
from the failed component, in a new location, to ensure data integrity.
Restricted MDM Mode A mode set in which commands can only be performed from an MDM machine.
Restricted SDC Mode Only approved SDCs can access the MDM. When this mode is enabled, volumes can
only be added to approved SDCs.
RFcache Read-only caching of storage devices performed on one or more designated SSD
devices in a VxFlex OS node.
S
SDBG The SDBG is a technical support troubleshooting tool, used to investigate for "live"
systems that retrieves internal information from different VxFlex OS components.
SDC Storage Data Client, a lightweight device driver that exposes VxFlex OS volumes as
block devices to the application residing on the same server on which the SDC is
installed.
SDS Storage Data Server, which manages the capacity of a single server and acts as a back-
end for data access. The SDS is installed on all servers contributing storage devices to
VxFlex OS.
Secondary MDM See Slave MDM.
Single Mode A single MDM manages the VxFlex OS network. This mode has no backup protection,
and should not be used in production environments.
Slave MDM An MDM in the cluster that is ready to take over the Master MDM role if ever
necessary.
Snapshot Capacity The amount of capacity occupied by snapshots of volumes.
Spare Capacity Capacity that is reserved for system use, when recovery from failure is required. This
capacity cannot be used for storage purposes.
Spare Percentage Policy This policy determines the amount of capacity that must always be reserved as free
space.
Standby MDM An MDM node that is ready to use, with an ID, that has been locked to a specific VxFlex
Ready Node system.
Storage Pool A sub-set of physical storage devices in a Protection Domain. Each storage device can
only belong to one Storage Pool. User volumes will always use the storage of a single
Storage Pool.
Glossary
352 Dell EMC VxFlex Ready Node AMS User Guide
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