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Cabling Configuration to allow FCAL Enclosures to be added without breaking the FCAL loop.

IP.com Disclosure Number: IPCOM000235618D
Publication Date: 2014-Mar-13
Document File: 3 page(s) / 81K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a cabling technique for Fibre Chanel Arbitrated Loop (FC-AL) Storage Enclosures that requires adding another connector to the Storage Enclosures such that the number of connectors is N+1, where N is the number of device controllers attached. By adding the additional connector, the additional Storage Enclosure can be added without re-cabling.

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Cabling Configuration to allow FCAL Enclosures to be added without breaking the FCAL loop.

Fibre Chanel Arbitrated Loop (FC-AL) Storage Enclosures house FC-AL disk drives. These enclosures are cabled to device controllers, which are the FC-AL initiators. When more storage is desired, more Storage Enclosures must be added to the FC-AL

loop.

For redundancy in high availability systems, the Storage Enclosures may be attached to multiple device controllers.

When cabling in an additional Storage Enclosure in a high availability environment, care must be taken to not take away access to the existing Storage Enclosures on the loop. It is also desirable to not require a re-cabling of the existing enclosures, since doing so exposes the system to a mis-cabling, which could cause a loss of access.

Figure 1: A Storage Enclosure with two connectors attached to two device controllers via cable 1 and cable 2

Adding a second Storage Enclosure with this cabling configuration requires removing an exiting cable. Figure 2 shows cable 2 has been moved to plug into Storage Enclosure 2 and a new cable has been added to connect the two Storage Enclosures. This technique has problems in that re-cabling of existing cables needs to be performed and one of the device controllers loses access to the Storage Enclosure 1 until the third cable is added.

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Figure 2: Cable 2 has been moved to plug into Storage Enclosure 2 and a new cable has been added to connect the two Storage Enclosures

The novel contribution is a cabling t...