Storage Definitions; Protection Domains; Storage Pools - Dell EMC VxFlex Ready Node User Manual
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Storage definitions
Protection Domains
Storage Pools
During the installation, you determine if the server will be a Manager or a Tie
Breaker (default).
2. Promote the server to Standby status, either as a Manager or as a Tie Breaker.
3. Add the standby server to the MDM cluster. A Manager, once entered into the
cluster can take on the Master or Slave state.
MDM cluster creation is done automatically when deploying a system with any of the
automated deployment tools.
When configuring VxFlex OS, you should take the following concepts into account:
Protection Domains, Storage Pools, and Fault Sets. Together, these elements link the
physical layer to the virtual storage layer.
A Protection Domain is a logical entity that consists of a group of SDSs that backs up
each other. Protection Domains can be added during installation and modified post-
installation.
A Protection Domain is a logical entity that contains a group of SDSs that provide
backup for each other. Each SDS belongs to one (and only one) Protection Domain.
Thus, by definition, each Protection Domain is a unique set of SDSs. In Figure 2 there
are three Protection Domains. The one in the middle (fully depicted) consists of seven
SDSs, each with two storage devices.
The maximum recommended number of nodes in a Protection Domain is 100. This
enables the following:
optimal performance
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reduction of theoretical
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ability to sustain multiple failures in different Protection Domains
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You can add Protection Domains during installation. In addition, you can modify
Protection Domains post-installation with all the management clients .
A Storage Pool is a set of physical storage devices in a Protection Domain. A volume is
distributed over all devices residing in the same Storage Pool. You can define a
Magnetic Storage Pool (for HDDs) or a High Performance Storage Pool (for SSDs).
Storage Pools support medium or fine granularity data layouts and allow enabling or
disabling zero padding.
Storage Pools allow the managing of different storage tiers in VxFlex OS. A Storage
Pool is a set of physical storage devices in a Protection Domain. Each storage device
belongs to one (and only one) Storage Pool. The figure "Protection Domains and
Storage Pools" depicts two Storage Pools.
When a volume is configured over the virtualization layer, (see "SAN virtualization
layer"), it is distributed over all devices residing in the same Storage Pool. Each
volume block has two copies located on two different SDSs. This allows the system to
maintain data availability following a single-point failure. The data will still be available
following multiple failures, as long as each failure took place in a different Storage
Pool.
mean time between failure issues
Dell EMC VxFlex Ready Node AMS User Guide
Architecture
29
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