Date: Tue, 30 May 2017 12:00:03 -0500 From: Dustin Wenz <dustinwenz@ebureau.com> To: freebsd-scsi@freebsd.org Subject: Inferring SAS expander topology Message-ID: <18E31C87-AB53-491F-9E40-F496AE31E305@ebureau.com>
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I'm working on a server that has 6 LSI SAS expanders connected to it. = Two of them are throwing intermittent command errors and need some = attention. Because the host only has four external 8088 ports, I know = some of the expanders are chained through each other. Before I can send parts for replacement, I need to determine if the two = problematic expanders are either daisy-chained or directly connected to = the host. On Linux, this is trivial; I would just browse the device = topology in /sys/. However, this machine is running FreeBSD 10.3, and I = am unable to find a way to do this. I have sg3_utils available, as well = as any build-in FreeBSD tools. Using this software, is it possible to = determine if a SAS expander is chained off of another? - .Dustin
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