Seen one of these on aliexpress ( JM575+JMS580) , had a bright idea (not realy) for experimental nas based on zero style sbc something like raxda zero 3E
The question is would it work as the usb to sata adapter in the picture is actualy usb to sata into sata multiplier adapter, so does anyone here has any experiance with SATA port multipliers and esspecialy port multipliers from usb to sata interface perspective?
yeah, any HBA card
no, cause WTF?
Interesting piece of hardware for an odd recovery job though
good first post by the way
Extensively so, though as TryTwice hinted the focus here has been more on HBAs than DAS. See the PCIe adapter, ASM1166, and similar threads. In general there’s not a lot of enthusiasm for SATA port multipliers due to a history of reliability issues and their intrinsic bandwidth constraints. For example, the JMB575 is a 1:5 multiplier so the five downstream ports share the upstream SATA link’s bandwidth. Since the JMS580 is USB 3 gen 1 (5 Gb/s) that’s not much of a constraint in this specific case but five SSDs can saturate gen 2x2.
Given all the complaints about them, I suspect many USB 3 gen 1 DASes are implemented with similar approaches. For gen 2 the ASM1352R’s a two port bridge (e.g. Mercury Elite Pro Dual) and the ASM235CM seems to be four (e.g. Mercury Elite Pro Quad). The AS5004U might also be ASM235CM.
I’ve googled some for ASM2362+ASM1166 type implementations and, while there’s likely something available, haven’t had luck finding higher bay count descriptions which indicate the chips used amidst all the single NVMe listings. Same with the ASM2364.
Well the idea wasn’t as much of a performance nas but a low power ( both in compute, and wattage ) cheap nas project to do, the sbc I have in mind Raxda zero 3E only has one gigabit ethernet port and one usb 3 port, i doubt both can do full speeds so that would probably be the bottleneck in the first place, but for a gigabit nas with no bells or wistles sorta thing might be a viable piece of kit if not for lols of running 5 hdds from a tiny sbc.
The concern is more of a software issue i think for somthing like OMV in the sense of - are hardrives being detected correctly for some kind of parity raid and dont do weird stuff after a while.
Though the suggested ASM1352R implamentations are interesting for direct from USB to SATA controller to drive - 2 drive nas, thanks for that one, none of those poped up in my searches.
The Jank-NAS: Odroid H3 that handles 2 HDDs directly and then has another 4 in a USB-Sata Enclosure, works okay-ish and occasionally saturates the 2x 2.5G links. The USB-enclosure disks are in a BTRFS raid1, which so far resulted in no differences against the ZFS pool in my main machine.
Could be fine, consider the price/jank factor against an Odroid HC4 though (unless you want to take one for the team, for science!)
ASM1166 versions are better and draw less power.