Date: Wed, 19 Aug 2015 11:14:24 -0500 (CDT) From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us> To: PK1048 <paul@pk1048.com> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: Optimizing performance with SLOG/L2ARC Message-ID: <alpine.GSO.2.01.1508191110340.15707@freddy.simplesystems.org> In-Reply-To: <3C6E3C03-9A64-4CEC-8238-2A73F4EE26D1@pk1048.com> References: <CAP1HOmTidC3%2BG4XfhvkQxieo%2BSYMq-JWiXF9Cs4FSW2VqkktWA@mail.gmail.com> <023F881D-CCC5-4FCA-B09D-EB92C3BFBC03@pk1048.com> <20150819154650.GA78333@neutralgood.org> <3C6E3C03-9A64-4CEC-8238-2A73F4EE26D1@pk1048.com>
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On Wed, 19 Aug 2015, PK1048 wrote: > > I have seen the RAM based battery-backed-up drives, and some are not > even ludicrous in terms of price, but I did not see any with FreeBSD > driver support. Since they are generally PCIe based (for speed), > drives are needed. RAID-oriented HBAs often offer battery-backed SRAM support. One would think that using one of these with a single attached SSD should serve as a lower-latency zil than the SSD itself. Driver support is then readily available. Bob -- Bob Friesenhahn bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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