From owner-freebsd-fs@FreeBSD.ORG Wed May 13 14:31:45 2009 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 85F1F106564A for ; Wed, 13 May 2009 14:31:45 +0000 (UTC) (envelope-from freebsd-fs@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 3AC748FC15 for ; Wed, 13 May 2009 14:31:45 +0000 (UTC) (envelope-from freebsd-fs@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1M4FUk-0002tJ-NH for freebsd-fs@freebsd.org; Wed, 13 May 2009 14:31:42 +0000 Received: from lara.cc.fer.hr ([161.53.72.113]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 13 May 2009 14:31:42 +0000 Received: from ivoras by lara.cc.fer.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 13 May 2009 14:31:42 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-fs@freebsd.org From: Ivan Voras Date: Wed, 13 May 2009 16:31:30 +0200 Lines: 40 Message-ID: References: <49FC1BD0.4030306@T-Online.de> <3c1674c90905130529r70589318tf57198d24cf2bd57@mail.gmail.com> <20090513135335.GA42884@voi.aagh.net> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig4C21049048231D29B0D83DC6" X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: lara.cc.fer.hr User-Agent: Thunderbird 2.0.0.21 (X11/20090409) In-Reply-To: <20090513135335.GA42884@voi.aagh.net> X-Enigmail-Version: 0.95.7 Sender: news Subject: Re: UFS2 and SSDs X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 May 2009 14:31:45 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig4C21049048231D29B0D83DC6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Thomas Hurst wrote: > * Kip Macy (kmacy@freebsd.org) wrote: >=20 >> I accidentally bought a camera-grade SSD. Random write performance >> with UFS made it unusable. I ended up converting /usr to ZFS - since >> which time I've been very happy with performance. >=20 > Did you try gjournal on it? SSD's should do better with sequential > journal writes. My guess is that it won't matter - the issue is "small writes" not "sequential writes". Gjournal will issue writes as it receives them - if it receives a bunch of small ones, it will pass them on in the same form, only sequential (the drive will still see a bunch of small writes). This works well for mechanical drives because of rotational properties but does nothing to SSDs. ZFS OTOH does a great deal of buffering. --------------enig4C21049048231D29B0D83DC6 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkoK2cIACgkQldnAQVacBciiTgCfdVe8hEyS++T5/QJSq5SrEXfI DwwAnA+9U71WvvtcFMujgwa+3vwonrAU =sGAH -----END PGP SIGNATURE----- --------------enig4C21049048231D29B0D83DC6--