DataCore SANsymphony software provides virtualization of storage devices for access by servers and applications as block or file storage. SANsymphony is an in-the-data-path appliance for mid to large SANs or on virtual machines to serve as a Virtual SAN offering advanced data services in addition to the shared storage. As a virtualization appliance, SANsymphony runs on an Intel- based 32 or 64-bit server called the Storage Domain Server (SDS). The Storage Domain Servers will have ownership of particular storage devices and present virtual logical units (LUNs) to the servers attached to the storage network as part of what is called Virtual Disk Pooling. SANsymphony support multiple petabytes in a Virtual Disk Poll. The Virtual Disk Pools can be organized into tiered storage classes and different SAN domains.
Multiple Storage Domain Servers may exist with each having distinct storage devices under their control. Security of access to LUNs is accomplished by explicit source-destination validation and repudiation using the World Wide Name of the server. Specific LUNs may be mirrored between Storage Domain Servers to provide for fault tolerant operation. Data flows through the Storage Domain Server when it is being transferred between the storage devices and the servers. Caching is done in the Storage Domain Server for performance considerations. Since each SDS owns distinct storage devices (operates asynchronously), caching of the data does not represent an exposure to coherency. In the case of mirrored data, the mirrored data is used in a failover state only with alternate path software in the servers.
The Storage Domain Servers may be configured in an N+1 arrangement, which provides a high availability and scaling solution. Unlike other solutions that must be configured in pairs, the DataCore solution operates in a round-robin type of protection system such that they may scale in increments of a single SDS.
When used as a Virtual SAN, SANsymphony is installed in virtual machines to provide block or file storage along with advanced features such as replication and snapshots. Both Flash storage internal to the server and externally attached storage are virtualized and managed by SANsymphony.
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