Date: Sun, 26 May 2013 16:40:18 -0700 From: Michael Sierchio <kudzu@tenebras.com> To: Warren Block <wblock@wonkity.com> Cc: Erich Dollansky <erichsfreebsdlist@alogt.com>, Polytropon <freebsd@edvax.de>, "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>, "M. V." <bored_to_death85@yahoo.com> Subject: Re: "swap" partition leads to instability? Message-ID: <CAHu1Y70LR_hKFr4C0rtW%2BRDVtUvX9VgCoUNadS4-S18jtG1pMw@mail.gmail.com> In-Reply-To: <alpine.BSF.2.00.1305261724050.29348@wonkity.com> References: <1369558712.96152.YahooMailNeo@web165006.mail.bf1.yahoo.com> <20130526160906.4e379016@X220.ovitrap.com> <20130526113235.f5dbe768.freebsd@edvax.de> <alpine.BSF.2.00.1305261724050.29348@wonkity.com>
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The Intel SLC mSATA drives I use in embedded devices don't support TRIM, but - it doesn't seem to matter. Actually, I'm confident that just using bare partitions for swap is fine, and I haven't had any of the trouble I witnessed with MLC devices. The difference is that the size is limited to under 32GB. - M On Sun, May 26, 2013 at 4:32 PM, Warren Block <wblock@wonkity.com> wrote: > On Sun, 26 May 2013, Polytropon wrote: > > On Sun, 26 May 2013 16:09:06 +0700, Erich Dollansky wrote: >> >>> Hi, >>> >>> On Sun, 26 May 2013 01:58:32 -0700 (PDT) >>> "M. V." <bored_to_death85@yahoo.com> wrote: >>> >>> I have a 24/7 network server/gateway with FreeBSD-8.2 on a SSD drive. >>>> it's partitioned as normal (/ , /tmp, /var , /usr and swap) for a >>>> long time now. But recently I heard from a FreeBSD expert that I >>>> shouldn't have swap partition for my server, and having swap >>>> partition could make my server unstable. this was so strange for me, >>>> and I searched a lot but couldn't find a reason for this claim. >>>> >>>> because it is a false claim. I never ever have had any system with >>> working hard, that gave a problem because of the swap space. >>> >> >> I think the "problem" here is that he's using a SSD. >> As soon as the swap partition is being in heavy use, >> which means it receives many writes, this may lead >> to the SSD "wearing out", decreasing its lifetime. >> > > Another problem with SSDs is that they can have difficulty with wear > leveling. This is even worse with swap because there is no way to use TRIM > to tell the SSD about blocks that have been freed. > > The workaround is a swapfile on UFS with TRIM enabled. It works fine, and > even better when you update the rc scripts for shutdown. > > Here's an article on setup: > http://www.wonkity.com/~**wblock/docs/html/ssd.html<http://www.wonkity.com/~wblock/docs/html/ssd.html>; > > And here is the PR with a patch: > http://www.freebsd.org/cgi/**query-pr.cgi?pr=bin/168544<http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/168544>; > > ______________________________**_________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/**mailman/listinfo/freebsd-**questions<http://lists.freebsd.org/mailman/listinfo/freebsd-questions>; > To unsubscribe, send any mail to "freebsd-questions-** > unsubscribe@freebsd.org <freebsd-questions-unsubscribe@freebsd.org>" >
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