Date: Fri, 18 Mar 2022 16:36:22 +0100 From: Tomasz CEDRO <tomek@cedro.info> To: David Christensen <dpchrist@holgerdanske.com> Cc: FreeBSD Questions Mailing List <freebsd-questions@freebsd.org> Subject: Re: PCIe 3.0 8 port SATA 6 Gbps HBA for SOHO network Message-ID: <CAM8r67B08Zh8RG0bC%2BSd3uV9WCx8tutJtwNVTLEbaBV7N-XZuQ@mail.gmail.com> In-Reply-To: <0a8f74d6-4579-79fc-3b73-08a09a692366@holgerdanske.com> References: <0a8f74d6-4579-79fc-3b73-08a09a692366@holgerdanske.com>
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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=C2=AE SAS 9207-8i PCI Express=C2=AE 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 --=20 CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
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