Date: Fri, 18 Mar 2022 21:47:48 -0700 From: David Christensen <dpchrist@holgerdanske.com> To: questions@freebsd.org Subject: Re: PCIe 3.0 8 port SATA 6 Gbps HBA for SOHO network Message-ID: <a9a0f91e-ef44-3aba-d647-a0c3816be0c7@holgerdanske.com> In-Reply-To: <CAM8r67B08Zh8RG0bC%2BSd3uV9WCx8tutJtwNVTLEbaBV7N-XZuQ@mail.gmail.com> References: <0a8f74d6-4579-79fc-3b73-08a09a692366@holgerdanske.com> <CAM8r67B08Zh8RG0bC%2BSd3uV9WCx8tutJtwNVTLEbaBV7N-XZuQ@mail.gmail.com>
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On 3/18/22 08:36, Tomasz CEDRO wrote: > On Fri, Mar 18, 2022 at 1:01 AM David Christensen wrote: >> I have a SOHO network with various x86_64 servers/ workstations/ >> desktops (FreeBSD, Debian, Windows) and an assortment of phones/ pads/ >> pods/ televisions/ game consoles, etc.. I would like to add more SATA 6 >> Gbps HDD's and/or SSD's to the x86_64 machines and am looking for a >> suitable PCIe 3.0 8 port SATA 6 Gbps host bus adapter (non-RAID). >> >> The LSI® SAS 9207-8i PCI Express® to 6Gb/s Serial Attached SCSI (SAS) >> Host Bus Adapter looks appealing: >> >> https://docs.broadcom.com/doc/12353331 >> >> Comments or suggestions? >> David > > Hello David :-) > > 1. PCI-E 3.0 x8 card may not achieve full 8 * 6Gbps as it close to > 7.877GB/s bus limits (according to [1]). If speed is not crucial this > card looks really nice may give plenty of storage at decent price. I > never used it but may also buy one :-) > > 2. If speed is crucial then you may consider M2 NVM controller for > newer SSD devices that are faster than SATA. Such controller works > with FreeBSD even on a motherboards with no NVM support in BIOS but > you need to boot and run kernel from a bios compatible device then use > nvm as root. Some newer motherboards may have no M2 NVM slot but > support for NVM in BIOS so you can boot directly from PCI-E NVM > controller in that case. > > 3. Real PCI-E speed depends on chipset. Older motherboard that I had > with AMD 970/SB950 chipset had 500MB/s limit for > Ethernet/SATA/PCI-Ex1, while only replacing motherboard to AMD 990FX > chipset gave 1GB/s with no problem, both are PCI-E 2.0 in theory. > > [1] https://en.wikipedia.org/wiki/PCI_Express Thank you for the reply. :-) At this point, I am looking to add SATA 6 Gbps ports for large HDD's. The drives can do ~150 to ~250 MB/s, so PCIe 3.0 (and 2.0) will not be the bottleneck. STFW there are reviews using eight SSD's and the LSI 9207-8i seems to keep up. David
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