Volumes can also be moved nondisruptively between I/O groups, e.g., when new node pairs are added or older technology is removed. Virtualized resources (= storage volumes presented to hosts) are distributed across I/O groups to improve performance. Write cache is protected by mirroring within a pair of SVC nodes, called I/O group. Intracluster communication includes maintaining read/write cache integrity, sharing status information, and forwarding reads and writes to any port. Hosts may also be attached via FCoE and iSCSI Gbit Ethernet ports. Each node has Fibre Channel ports simultaneously used for incoming, outgoing, and intracluster data traffic. Earlier models featured external battery-backed power supplies. Nodes are rack-mounted appliances derived from IBM System x servers, protected by redundant power supplies and integrated batteries. SVC nodes are always clustered, with a minimum of 2 and a maximum of 8 nodes, and linear scalability. Finally, spreading an SVC installation across two or more sites ( stretched clustering) enables basic disaster protection paired with continuous availability. All advanced functions are therefore implemented in the virtualization layer, which allows switching storage array vendors without impact. It also aims at simplifying compatibility requirements in strongly heterogeneous server and storage landscapes. The virtualization approach allows for non-disruptive replacements of any part in the storage infrastructure, including the SVC devices themselves. SVC is physically attached to one or several SAN fabrics. It logically sits between hosts and storage arrays, presenting itself to hosts as the storage provider (target) and presenting itself to storage arrays as one big host. The IBM 2145 SAN Volume Controller (SVC) is an inline virtualization or "gateway" device. SVC implements an indirection, or "virtualization", layer in a Fibre Channel storage area network (SAN). The IBM SAN Volume Controller ( SVC) is a block storage virtualization appliance that belongs to the IBM System Storage product family. ( Learn how and when to remove this template message) JSTOR ( June 2020) ( Learn how and when to remove this template message).Please improve this article by adding secondary or tertiary sources.įind sources: "IBM SAN Volume Controller" – news This article relies excessively on references to primary sources.
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