Date: Tue, 06 Jan 2009 11:12:06 +1100 From: Andrew Snow <andrew@modulus.org> To: Koen Smits <kgysmits@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: FreeBSD, SSD's and partition alignment Message-ID: <4962A1D6.4040508@modulus.org> In-Reply-To: <b072dc420901051221t3cf398b0m1095946e9918c0f3@mail.gmail.com> References: <b072dc420901051221t3cf398b0m1095946e9918c0f3@mail.gmail.com>
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> I'd like to discuss this subject a bit if anyone's interested. > - partition alignment seems to be a real problem with some of today's flash > and RAID media. I think people need to know one could easily increase > performance (and media wear!) as no one knows this problem exists. Thanks for your interesting post! In my humble opinion, FreeBSD should not worry about this problem for the following reasons: 1. Performance for random write I/O still sucks even when the sector boundary is correct. Doing something like untarring src or ports causes many small write I/Os, and it is simply a shortcoming of early generation flash controller technology that they erase and rewrite in large blocks. 2. This problem will go away when flash controller technology improves. Intel SSDs have already demonstrated they can have great performance *and* a small erase block size, mitigating the issue completely. This technology will trickle down to the cheaper flash SSDs over time. - Andrew
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