I have a 4U chassis which I can fit 36 2.5" (4x 8 + 1x4). I'll be using SATA drives, but may migrate to SAS.
I'll be using ZFS to manage the array. So, the 1x4 will house the SSDs and hot spares
I presently have an Intel RES2CV360 and RES2CV240 which are laid out like this:
From what I gather in other forum posts the 36 port seems to only work with up to 24 disks?
The manual states "
So, my plan presently is:
RES2CV360 H + I to Atto H680 (Two ports)
RES2CV360 G to RES2CV240 F
RES2CV360 A - F for first 24 disks (I figure I will put the SSDs up front in A of the RES2CV360, but not sure it's relevant).
RES2CV240 - A-C for next 12 disks
I am left with RES2CV240 D + E ..... One or both of which I can use for daisy chaining but presently I only need one. However would it make more sense to "dual link" from one expander to the other?
Clarification: By dual link I was primarily interested in redundancy. Previously I had the chassis with two separate SAS cables going into the two ports of the H680. However, it seems some with SAS disks use a single SAS port with two connections? I'm not sure if my references to dual link and multi path are semantically correct.
The expansion / daisy chain link will be for a slower backup unit of 3.5" disks which will not saturate 6Gbps and has its own expander.
Am I missing something? Curious what others have done / what would be the optimal setup.
I would like to get a full idea before ordering cabling as I'd like to keep the chassis as clean as possible and optimize airflow.
I'll be using ZFS to manage the array. So, the 1x4 will house the SSDs and hot spares
I presently have an Intel RES2CV360 and RES2CV240 which are laid out like this:
From what I gather in other forum posts the 36 port seems to only work with up to 24 disks?
The manual states "
- Cables from the SAS Expander to the hot swap backplane must be connected in order: A–D for 16-drive configurations, and A–F for 24-drive configurations.
So, my plan presently is:
RES2CV360 H + I to Atto H680 (Two ports)
RES2CV360 G to RES2CV240 F
RES2CV360 A - F for first 24 disks (I figure I will put the SSDs up front in A of the RES2CV360, but not sure it's relevant).
RES2CV240 - A-C for next 12 disks
I am left with RES2CV240 D + E ..... One or both of which I can use for daisy chaining but presently I only need one. However would it make more sense to "dual link" from one expander to the other?
Clarification: By dual link I was primarily interested in redundancy. Previously I had the chassis with two separate SAS cables going into the two ports of the H680. However, it seems some with SAS disks use a single SAS port with two connections? I'm not sure if my references to dual link and multi path are semantically correct.
The expansion / daisy chain link will be for a slower backup unit of 3.5" disks which will not saturate 6Gbps and has its own expander.
Am I missing something? Curious what others have done / what would be the optimal setup.
I would like to get a full idea before ordering cabling as I'd like to keep the chassis as clean as possible and optimize airflow.
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