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Table 1 provides definitions for some of the terms used in this white paper.
Table 1. Terminology
Term |
Definition |
ASM |
Automatic Storage Management—ASM is Oracle’s preferred method of storage for Oracle files on block storage devices. |
CRS |
Cluster Ready Services—A layer of software provided by Oracle to facilitate an Oracle RAC cluster. |
MESH Mirror |
ScaleIO’s technique to protect against node failure by mirroring data blocks on separate nodes of the protection domain. (It implies many to many storage server host network interconnectivity.) |
Pool |
A logical grouping of physical storage devices from SDS nodes in a single protection domain from which are created volumes that are presented to SDC hosts. |
Protection domain |
A group of ScaleIO Data Clients (SDCs) and ScaleIO Data Servers (SDSs) grouped together to optimize network traffic and provide a level of isolation for critical applications. |
RAC |
Real Application Clusters—Oracle’s horizontal scale out solution where a single set of database files can be processed by Oracle instances on multiple nodes simultaneously. |
RAID |
Redundant array of independent disks—A method for storing information where the data is stored on multiple disk drives to increase performance and storage capacity and to provide redundancy and fault tolerance. |
SDC |
ScaleIO Data Client—A node inside or outside of a ScaleIO storage cluster that can consume storage from the ScaleIO system. |
SDS |
ScaleIO Data Server—A node in a ScaleIO cluster that stores data on local disk, whether SSD, or HDD, and presents logical volumes to clients. |
Storage pool |
Storage pools are logical collections of disks in ScaleIO. All disks within a given pool should be of the same performance, caching mechanism, and capacity. Multiple storage pools can have the same characteristics, but a single disk can only belong to a single storage pool. |
VMDK |
VMware virtual disk—VMDKs appear as block devices to guest OSes running under VMware, but are stored in VMFS datastores. |
VMFS |
VMware File System—VMware’s proprietary clustered file system that is used to create datastores on block devices presented from an array. VMware storages VMDKs as well as other files required by the guest OSes running under VMware. |
Volume |
An SCSI block device presented to the host via the SDC client software, by the ScaleIO cluster. |