By Greg Schulz
A resilient garage community is an atmosphere the place information is usually on hand for the wishes of the company. This publication explains the elements, in addition to how you can layout and enforce a resilient garage community for workgroup, departmental, and firm environments. garage networks are an allowing strength combining expertise and top practices to supply the basis to help info expertise structures and purposes. garage networks might be of varied sizes, shapes, and applied sciences. This booklet exhibits you ways to enforce a resilient garage community infrastructure utilizing varied applied sciences together with ATM, DWDM, FCIP, Fibre Channel, FICON, iFCP, InfiniBand, IP, iSCSI, lifestyles Cycle administration, NAS, item dependent garage, RAID, RDMA, distant Mirroring, Replication, SAN, SCSI, SMI-S, SONET/SDH, garage prone, Tape, Virtualization, and quantity Managers. *Important details is clarified and positioned into context to split myths and realities *Covers garage networking applied sciences (hardware, software program, networks) and practices*Numerous information and proposals permit the reader to speedy comprehend top practices*Checklists, templates and examples convey power suggestions
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Ultimately the data is read and written from the disk in blocks. A typical block, also known as a page of memory for open systems, will usually be a multiple of 512 bytes. Open systems environments are known as Fixed-Block Architectures (FBA) in that their block sizes are fixed when the disk and filesystem are formatted. While there can be multiple blocks and even larger blocks, they are still based upon 512 bytes of data, which is also what the disk drives are formatted on. For IBM mainframe environments, a variable format referred to as CKD and ECKD is used.
10 Networks for storage First-generation “proprietary” storage networks include shared interfaces such as S/390 Mainframe ESCON, IBM SSA, HP (formerly DEC) Open VMS CI, and, later, FDDI and DSSI. While not popular from a multiserver standpoint, parallel SCSI from a shared storage bus standpoint (multi-initiator SCSI) has also been deployed for small clusters. First-generation LAN networks were deployed in vendor-specific proprietary Chapter 3: Networking with Your Storage 33 34 Chapter 3: Networking with Your Storage topologies, media, and protocols that later gave way to open and standard Ethernet and IP as a networking combo.
More recently, Fibre Channel is being supported as an I/O channel interface to the previously mentioned network interfaces for channel extension and also to support the emerging SAN-to-SAN application market. The rudimentary method for device-to-device channel extension is frame passing, where frames are taken off the I/O channel at one end, mapped onto a LAN/WAN interface, and transmitted over distances where frames are placed on the remote channel. The effect is to create a virtual channel, or virtual storage network link, to interface the two sides together.