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large-storage-custom-nas - index.md

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Stopped working previously, so working down where.
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engineershamrock
2024-03-07 00:28:49 +00:00
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@@ -177,50 +177,3 @@ If you look at this motherboard it is 2 x 1x and 1 x 2x and 3 x 4x PCIE interfac
There are multiple SATA cards that provide good 8x SATA interfaces such as this [StarTech](https://www.startech.com/en-gb/cards-adapters/8p6g-pcie-sata-card) There are multiple SATA cards that provide good 8x SATA interfaces such as this [StarTech](https://www.startech.com/en-gb/cards-adapters/8p6g-pcie-sata-card)
it's a fast card, does the job well, so with 3 of these in I get 24 ports. Alas not getting me close to the 120 I wanted, so no real use. it's a fast card, does the job well, so with 3 of these in I get 24 ports. Alas not getting me close to the 120 I wanted, so no real use.
# Time to go SAS
{{< image src="images/s-l1600 (1).jpg" width="150x" class="is-pulled-right" height="200x" title="">}}
SAS cards are incredibly cheap and relatively quick and compatible with SATA drives, not to be confused with SAS drives ARE NOT compatible with SATA controllers. This one is goes for about $30 and has 2 ports on board.
{{< image src="images/s-l1600 (2).jpg" width="150x" class="is-pulled-right" height="200x" title="">}}
To make the best use out of it you also need to expand the number of ports available, which is where this card comes in.
It is an Intel RES2SV240 RAID card. It is not really a RAID card in this case, but provides 24 ports, of which 4 are inbound and 20 outbound. This card is relatvely good as you can then use SFF8087 cables to SATA ports, keeping the cabling manageable, rather than individual SATA cables
So let's do the maths
- SAS card - 2 physical ports
- Intel RES240 - 20 outbound ports, so based on the LSI card , 2 of these connected per LSI card = 40 ports
So three (3) LSI cards and 6 RES240 cards = 120 ports. We are there.
{{< image src="images/s-l1600 (2).jpg" width="150x" class="is-pulled-right" height="200x" title="">}}
Even better the RES240 cards do not actually need to plug into the motherboard, they just need power and are fitted with an external power socket!!!
- This is an amazing win.
- I started the build out as follows
{{< image src="images/IMG_2870.jpg" width="150x" class="is-pulled-right" height="200x" title="">}}
{{< image src="images/IMG_2800(1).jpg" width="150x" class="is-pulled-right" height="200x" title="">}}
{{< image src="images/IMG_2804.jpg" width="150x" class="is-pulled-right" height="200x" title="">}}
Add some drive location testing
{{< image src="images/IMG_2883.jpg" width="150x" class="is-pulled-right" height="200x" title="">}}
It is brilliant what could go wrong!
As it turns out ... there is always something!
When I added an additional 14, the SAS controller only showed 24, but 14 + 14 = 28
It turns out SAS controller cards do not have an unlimited number ports, they can only service 24 drives per card! Some mention 16 , some 32, all the ones I bought that touted different numbers, the upper limit was always 24.
The best we can do with 3 controllers is then 72 drives ( 1 RES240 card + other physical port to 4 drives ).
Close but not yet 120 drives - ARG!!!!!