Date: Tue, 17 May 2016 15:29:20 +0300 From: Daniel Kalchev <daniel@digsys.bg> To: Alex Tutubalin <lexa@lexa.ru> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS performance bottlenecks: CPU or RAM or anything else? Message-ID: <BD7DE274-04EB-4B19-988D-5A6FADC5B51A@digsys.bg> In-Reply-To: <16e474da-6b20-2e51-9981-3c262eaff350@lexa.ru> References: <8441f4c0-f8d1-f540-b928-7ae60998ba8e@lexa.ru> <f87ec54a-104e-e712-7793-86c37285fdaa@internetx.com> <16e474da-6b20-2e51-9981-3c262eaff350@lexa.ru>
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> On 17.05.2016 г., at 15:21, Alex Tutubalin <lexa@lexa.ru> wrote: > > On 5/17/2016 3:11 PM, InterNetX - Juergen Gotteswinter wrote: >> Raidz is your Problem, go for Mirrors > > Raidz2 will survive two (any) drives failure, while mirrored stripe will not. > Not true. You can have N-way mirror and it will survive N-1 drive failures. > So, if it is possible to increase raidz2 performance by faster CPU or RAM I'll go this route The limitations of RAIDZ performance do not come from CPU or RAM limitations, but by the underlying hardware. RAIDZ is limited to the performance of a single disk IOPS. CPU/RAM these days are so much faster than spinning disks or SSDs. Daniel
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