Date: Mon, 22 Aug 2016 09:29:01 -0700 From: Freddie Cash <fjwcash@gmail.com> To: Karl Denninger <karl@denninger.net> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: Recommended HBA for ZFS, contemporary Message-ID: <CAOjFWZ7ZuUSATY_83_HipqU=ebgkXGjvrknbrvB0S3hL1B3iJg@mail.gmail.com> In-Reply-To: <ba972848-140c-31a8-505e-2470ed750fc8@denninger.net> References: <alpine.BSF.2.00.1608221904270.82304@woozle.rinet.ru> <ba972848-140c-31a8-505e-2470ed750fc8@denninger.net>
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On Mon, Aug 22, 2016 at 9:22 AM, Karl Denninger <karl@denninger.net> wrote: > I'm still a fan of the LSI SAS-9211 cards along with (for higher > density) a SAS port expander. I've been extremely happy with this > combination with one caveat -- most systems must boot from the actual > card and not a port on the expander(s) you connect to it due to BIOS > constraints. They're also crazily cost-effective on-balance. > > In practice this means you have 4 ports on the base card available (2 > used for mirrored boot drives, 2 for other things) and the rest of the > disks go on the expander, or you run more than one card. > =E2=80=8BAlternatively, you can use the SATA/SAS ports on the motherboard f= or the OS drives / to boot from, leaving all the ports on the HBAs for the data disks. :) We also use the motherboard ports for the ZFS Log and Cache devices, to separate the I/O channels. Granted, this depends on the motherboard having good quality SATA controllers, but most are good enough for booting/loading programs from. > The "smarter" the card the dumber the results tend to be when ZFS is in > use, in my experience :) > =E2=80=8BThat's a great way to explain things. Will have to remember that = one!=E2=80=8B --=20 Freddie Cash fjwcash@gmail.com
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