Date: Wed, 13 May 2009 16:31:30 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-fs@freebsd.org Subject: Re: UFS2 and SSDs Message-ID: <guelk2$jab$1@ger.gmane.org> In-Reply-To: <20090513135335.GA42884@voi.aagh.net> References: <49FC1BD0.4030306@T-Online.de> <guecop$jtd$1@ger.gmane.org> <3c1674c90905130529r70589318tf57198d24cf2bd57@mail.gmail.com> <20090513135335.GA42884@voi.aagh.net>
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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--
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