834 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
Storage pool (managed disk group)
A storage pool is a collection of storage capacity, which is made up of managed disks
(MDisks), that provides the pool of storage capacity for a specific set of volumes. A storage
pool can contain more than one tier of disk, which is known as a multitier storage pool and a
prerequisite of Easy Tier automatic data placement.
Striped
Pertaining to a volume that is created from multiple managed disks (MDisks) that are in the
storage pool. Extents are allocated on the MDisks in the order specified.
Support Assistant
A function that is used to provide support personnel access to the system to complete
troubleshooting and maintenance tasks.
Symmetric virtualization
Symmetric virtualization is a virtualization technique in which the physical storage, in the form
of a Redundant Array of Independent Disks (RAID), is split into smaller chunks of storage
known as extents. These extents are then concatenated, by using various policies, to make
volumes. See also “Asymmetric virtualization” on page 820.
Synchronous replication
Synchronous replication is a type of replication in which the application write operation is
made to both the source volume and target volume before control is given back to the
application. See also “Asynchronous replication” on page 820.
Thin-provisioned volume
A thin-provisioned volume is a volume that allocates storage when data is written to it.
Thin provisioning
Thin provisioning refers to the ability to define storage, usually a storage pool or volume, with
a “logical” capacity size that is larger than the actual physical capacity that is assigned to that
pool or volume. Therefore, a thin-provisioned volume is a volume with a virtual capacity that
differs from its real capacity.
Throttles
Throttling is a mechanism to control the amount of resources that are used when the system
is processing I/Os on supported objects. The system supports throttles on hosts, host
clusters, volumes, copy offload operations, and storage pools. If a throttle limit is defined, the
system either processes the I/O for that object, or delays the processing of the I/O to free
resources for more critical I/O operations.
Transparent Cloud Tiering
Transparent Cloud Tiering is a separately installable feature of IBM Spectrum Scale™ that
provides a native cloud storage tier.
T10 DIF
T10 DIF is a Data Integrity Field (DIF) extension to SCSI to enable end-to-end protection of
data from host application to physical media.
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