786 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
Statesave
Binary data collection that is used for a problem determination by IBM service support.
Storage area network or SAN
A SAN is a dedicated storage network that is tailored to a specific environment, which 
combines servers, systems, storage products, networking products, software, and services.
Storage pool (managed disk group)
A storage pool is a collection of storage capacity, which is made up of 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 MDisks that are in the storage pool. 
Extents are allocated on the MDisks in the order specified.
Support Assistance
A function that is used to provide support personnel remote access to the system to perform 
troubleshooting and maintenance tasks.
Symmetric virtualization
Symmetric virtualization is a virtualization technique in which the physical storage, in the form 
of a 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 770.
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 770.
Tie-break
In a case of a cluster split in two groups of nodes, tie-break is a role of a quorum device used 
to decide which group continues to operate as the system, handling all I/O requests.
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.
Thin provisioning savings
See “Capacity” on page 771.