SAS-Lanes and SAS-Expander quesitons (alien.top)

submitted 11 months ago by ITisWeirdSometimes@alien.top to c/homelab@selfhosted.forum

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Hey guys!

I own a HP Server with a p408i-a. I have connected it to a SAS expander.

8 Slots of the SAS Expander are filled with the front disks in the server. 2 Slots are connected to the RAID-Controller. So far so good, everyhing is working. I want to connect another SAS-Device to my expander - will it work?

The p408i-a has 8 SAS lanes. Do I need 1 lane per available/used slot on the expander? Or is it just total bandwidth? Somehow I couldn't find any information about that online. Any help? :)

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[-] cruzaderNO@alien.top 1 points 11 months ago

You can put a tape drive on the last port like you describe.

Nothing on the expander will suffer unless the full 96gbit link to raid card is saturated and it has to start throtteling stuff.

if you have something 4-8x cache SSDs with high load they would normally go in one cage and that cage gets its own controller.
To not risk saturating the link from expander and impacting performance + avoid the tiny latency expander adds.

[-] ITisWeirdSometimes@alien.top 1 points 11 months ago

Thank you again. I only have 10k 2,5" HDDs, so I guess I won't be close to saturating it. That really helps!

this post was submitted on 04 Dec 2023

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