HyperSCSI

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HyperSCSI defines an efficiently designed, non-routable protocol from the area of storage networks . The transmission takes place via Gigabit Ethernet and can transmit SCSI data streams with approx. 100 Mbytes / s (net). In contrast to UltraSCSI-320, which only has cables with max. Supported 15 m, with HyperSCSI several kilometers or 100 m (via TP copper cable) can be bridged via fiber optics. Since HyperSCSI does not use TCP / IP , it is more efficient than iSCSI and more comparable to ATA over Ethernet or Fiber Channel . Since HyperSCSI is in direct competition with the older, stable and long-established Fiber Channel, as well as with the well-established iSCSI, but it does not offer any significant advantages in practice, its market opportunities can only be rated as low. The also competing ATA over Ethernet, however, has at least the marketing advantage of the low-cost technology, which HyperSCSI does not adhere to.

HyperSCSI transfers the data in the form of Ethernet frames and does not use higher-level protocols such as IP , UDP or TCP . The advantage of the Ethernet base - compared to Fiber Channel - is that the widespread Ethernet network standard is used and the same technologies and components (cabling, switches, etc.) are used in the storage network as in the rest of the network. The waiver of TCP / IP also ensures better efficiency than iSCSI. However, the Ethernet packets transmitted by HyperSCSI cannot be routed and consequently can not leave a Layer 2 network , which is why the use of HyperSCSI is mainly limited to local storage area networks . Technically, HyperSCSI is significantly simpler than the closely related iSCSI and quite similar to the Fiber Channel. There is at least a Linux implementation on Sourceforge (from 2003, for the 2.4.x kernel), like a Windows 2000 client implementation, but currently no (major) manufacturers using this protocol

Similar standards

  • ATA over Ethernet : With ATA over Ethernet, ATA / ATAPI packets are encapsulated in Ethernet. As with HyperSCSI, there is no encapsulation in TCP / IP, so AoE cannot be routed either.
  • Fiber Channel : FC defines a non-routable standard protocol from the field of storage networks, which was designed as the successor to SCSI for the high-speed transmission of large amounts of data. FC is not compatible with Ethernet, a separate infrastructure (NICs, switches, etc.) is required.
  • Fiber Channel over Ethernet : With Fiber Channel over Ethernet, Fiber Channel packets are encapsulated in Ethernet. In contrast to iSCSI, however, there is no encapsulation in TCP / IP, which results in minor performance advantages, but FCoE cannot be routed.
  • Fiber Channel over IP With Fiber Channel over IP, Fiber Channel packets are also encapsulated in TCP / IP. FCoIP is therefore routable.
  • iSCSI (SCSI over IP): With iSCSI, SCSI packetsare encapsulated in TCP / IP. In contrast to HyperSCSI , iSCSI can be routed.

See also

Web links

Individual evidence

  1. ↑ Download HyperSCSI Linux software, client and server
  2. ↑ A * STAR Data Storage Institution, Windows 2000 Client  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. @1@ 2Template: Toter Link / www.dsi.a-star.edu.sg