Method and system of SAS domain change non-fully ergodic discovery process

Abstract

The invention discloses a method of SAS domain change non-fully ergodic discovery process, comprising the followings: an expander apparatus detects that the SAS link itself is changed, SAS domain state change information is reported to an SAS initiator, the SAS initiator sends the request for obtaining changed phy information to corresponding expander apparatus according to the SAS domain state change information; after the corresponding expander apparatus returns a response containing changed phy information, whether the change is added for the apparatus is judged according to the type of the connecting apparatus of the phy information; if so, DISCOVER request is sent corresponding to the phy ID of the phy information. Moreover, the invention further discloses a system of SAS domain change non-fully ergodic discovery process. The technical proposal disclosed by the invention can improve the operation performance of SAS memory system.

Description

Technical field [0001] The present invention relates to communication technology, and in particular to a method and system for SAS (Serial Attached SCSI) domain change non-full traversal of Discovery (discovery) process. Background technique [0002] In communication technology, the SAS domain system usually includes: an expander device (Expander Device), a SAS initiator (SAS initiator), and a SAS device (SAS Device, also called a terminal device). Expander equipment is a kind of switching equipment used for data communication between SAS equipment or between SAS equipment and SASinitiator. [0003] In actual applications, the number of devices included in different SAS domains may be different, and correspondingly, they may have different topological structures. In addition, when the link status of the same SAS domain changes, the original topology structure will also be changed. Therefore, the SAS initiator needs to obtain the topology information of the SAS domain from time to...

AI Technical Summary

Problems solved by technology

[0014] However, in the above process, the BROADCAST (CHANGE) message does not contain specific SAS domain change information. When the SAS initiator receives the BROADCAST (CHANGE), it can only know that the SAS domain has changed, and cannot directly report from the BROADCAST (CHANGE) Get the specific information of SAS domain changes in the text, such as whether there are Expander devices added or deleted, etc.

Since the SASinitiator cannot know the specific SAS domain change information, the SAS initiator must perform a complete traversal of the entire SAS domain, and initiate requests to all phys of all Expander devices in the current SAS domain in order to obtain complete information about the current SAS domain , so that information exchange takes a long time, and in order to wait for the Discovery process to complete, the I / O data processing in the SAS domain is blocked

Therefore, in a SAS domain containing many devices, if many SAS domain changes occur, the frequent triggering of the Discovery process will affect the operating performance of the SAS storage system

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