Browse Prior Art Database

A Method to Daisy Chain multiple CECs Disclosure Number: IPCOM000130555D
Original Publication Date: 2005-Oct-26
Included in the Prior Art Database: 2005-Oct-26
Document File: 2 page(s) / 27K

Publishing Venue



The limitation which is present today is that of central electronic complexes (CEC's) having to be configured with a virtual I/O server (VIOS) partition, in order to enable the partitions in the CEC to have network access external to the CEC. This requires every CEC to have at least one network interface card (NIC). Now this can be limiting when all the partitions are not running network heavy loads to external hosts.

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A Method to Daisy Chain multiple CECs







This solution may allow the administrator to connect multiple CECs into one ethernet network, similar to connecting ethernet switches. The CECs can be interconnected by a special port or via ethernet ports. This is possible because the power hypvervisor (PHYP) can do such switching. The immediate advantages of going through such a port include: use of "large send" and eliminating VIOS partitions in CECs when only ethernet connectivity is required.


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"Large send" is when data to be sent is not broken into smaller ethernet packets but sent as one big chunk, which is faster and more efficient in terms of central processing unit (CPU) utilization. While this technique will eliminate the need to have a VIOS on the connected CECs [only when no virtual small computer system interface (VSCSI) is involved], it will also reduce the number of resources used, such as CPU time, memory, and disks.