Date: Tue, 29 May 2012 14:30:27 -0400 From: Pierre-Luc Drouin <pldrouin@pldrouin.net> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: newfs on a SSD Message-ID: <CANT0rcvMzLPa9dyr2EAPio7efJKrxG0F%2BeUEDrn6vvmBnLg9oA@mail.gmail.com> In-Reply-To: <20120529180500.GA92876@slackbox.erewhon.net> References: <CAMVU60aNdCE26D41qOO99YoxHJFF1h8Mmd7=j1RmRmG-yv0mpA@mail.gmail.com> <20120529180500.GA92876@slackbox.erewhon.net>
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On Tue, May 29, 2012 at 2:05 PM, Roland Smith <rsmith@xs4all.nl> wrote: > On Fri, May 11, 2012 at 09:01:33AM +0200, Christer Solskogen wrote: > > After years of waiting for a decent price on one of these I finally > > got one. The questions is, which options should I use on a SSD that > > will be / on my system. I see that newfs supports TRIM, so that will > > be turned on, but should I use journaling? gjournal? softupdates? soft > > updates journaling? I'm confused :) > > Enabling TRIM with the '-t' option for newfs sounds like a good idea. > Assuming > the underlaying device supports it. You can check that with the 'camcontrol > identify' command, assuming you're using the ada(4) driver. > > OCZ has a page with tips for Linux. Some would apply to FreeBSD as well; > > http://www.ocztechnologyforum.com/forum/showthread.php?54379-Linux-Tips-tweaks-and-alignment&highlight=linux > > Aligning the partitions with the Erase Block Size is important. See: > https://wiki.archlinux.org/index.php/Solid_State_Drives > > One thing to keep in mind is to mount the filesystems you make on the SSD > with > the "noatime" option. This to avoid a lot of unnecessary writes. > > Some of the newfs parameters like blocks per cilinder group don't seem to > make > much sense for an SSD. Since the controller of the SSD already does all > kinds > of things to emulate a harddisk, I'm not sure if it makes much sense to > tune > the filesystem's parameters much. > > As for softupdates (journaled of not): try it and let us know if you see > differences, especially in write performance. :-) > > The FreeBSD foundation has awarded a grant to port a special Flash > filesystem > and tools to FreeBSD: > > http://freebsdfoundation.blogspot.com/2012/03/new-project-nand-flash-support.html > It might be worthwhile to keep that in mind for the future. > > What I would certainly recommend is that you make a daily automated backup > (may I suggest calling rsync from cron at night?) of the SSD's filesystem > to > an actual HDD, just to be sure. > > Roland > -- > R.F.Smith http://rsmith.home.xs4all.nl/ > [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] > pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725) > Is there a tool in FreeBSD, similar to fstrim in Linux, that allows to perform trimming through a cronjob as opposed to perform it every time data is deleted? It supposedly results into a significant gain in performance... Thanks!
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