Date: Tue, 29 May 2012 20:05:00 +0200 From: Roland Smith <rsmith@xs4all.nl> To: Christer Solskogen <christer.solskogen@gmail.com> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: newfs on a SSD Message-ID: <20120529180500.GA92876@slackbox.erewhon.net> In-Reply-To: <CAMVU60aNdCE26D41qOO99YoxHJFF1h8Mmd7=j1RmRmG-yv0mpA@mail.gmail.com> References: <CAMVU60aNdCE26D41qOO99YoxHJFF1h8Mmd7=j1RmRmG-yv0mpA@mail.gmail.com>
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--u3/rZRmxL6MmkK24 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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. Assum= ing 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-twe= aks-and-alignment&highlight=3Dlinux Aligning the partitions with the Erase Block Size is important. See:=20 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 w= ith 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 m= ake much sense for an SSD. Since the controller of the SSD already does all kin= ds 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 filesyst= em and tools to FreeBSD: http://freebsdfoundation.blogspot.com/2012/03/new-project-nand-flash-suppor= t.html It might be worthwhile to keep that in mind for the future.=20 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 --=20 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) --u3/rZRmxL6MmkK24 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAk/FD8wACgkQEnfvsMMhpyX1RQCfS7BBwzUUZSZGKOaJh4BDCEmP nk4AnRm5PpZKxq0a6wAS42osl0Cox7Wx =TWJj -----END PGP SIGNATURE----- --u3/rZRmxL6MmkK24--
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