Date: Thu, 12 May 2011 11:33:27 +0300 From: Daniel Kalchev <daniel@digsys.bg> To: freebsd-fs@freebsd.org Subject: Re: ZFS: How to enable cache and logs. Message-ID: <4DCB9B57.8090507@digsys.bg> In-Reply-To: <A0F4CB3E-1068-4E19-A50F-AA5620A9EB85@gmail.com> References: <4DCA5620.1030203@dannysplace.net> <4DCB455C.4020805@dannysplace.net> <4DCB81B8.6070301@digsys.bg> <A0F4CB3E-1068-4E19-A50F-AA5620A9EB85@gmail.com>
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On 12.05.11 11:02, =8Aimun Mikecin wrote: > > You will not find a rotating hard drive that has a write latency anythi= ng near the write latency of even a slowest SSD you can find on the marke= t. > Cheap SSDs do not have acceptable latency, when saturated with writes.=20 Not to speak of throughput. Truth is, SLOG should be on write-optimized SLC SSD. Any tricks, such as = compression, manufacturers make with consumer products do influence=20 Windows benchmarks, but are unlikely to change laws of physics. For most small installs, using rotating magnetic media (cheap!) as SLOG, = can have dramatic performance improvement compared to not using any SLOG.= Daniel
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