Date: Thu, 5 May 2011 19:00:37 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: freebsd-fs@FreeBSD.org, Alexander Motin <mav@FreeBSD.org> Subject: Re: TRIM clustering Message-ID: <20110505170037.GG14661@garage.freebsd.pl> In-Reply-To: <20110505164001.79532nb02isxjlxc@webmail.leidinger.net> References: <4DBBB20A.5050102@FreeBSD.org> <20110430072831.GA65598@icarus.home.lan> <20110501000656.00007ea1@unknown> <20110501133752.GC3245@garage.freebsd.pl> <20110503134826.712070yt2urhxp8g@webmail.leidinger.net> <20110505133156.GE14661@garage.freebsd.pl> <20110505164001.79532nb02isxjlxc@webmail.leidinger.net>
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--lHGcFxmlz1yfXmOs Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, May 05, 2011 at 04:40:01PM +0200, Alexander Leidinger wrote: > >>>>This brings up the question if a ZFS cache (where the contents do not > >>>>survive a reboot) is completely TRIMmed before used (and normally > >>>>trimmed during use)... > >>> > >>>It is not trimmed at all. > >> > >>This does not sound like the optimal solution... is there a way to >=20 > >TRIM will be more useful for regular data within a pool and most useful > >for log devices as we do free blocks there and this is where latency is > >critical (log devices are there to reduce latency). >=20 > Wait, does this mean that ZFS does not TRIM at all? I was > understanding your first answer as the cache is not trimmed at all. You asked for cache and I answered about cache, but ZFS does not TRIM in general. --=20 Pawel Jakub Dawidek http://www.wheelsystems.com FreeBSD committer http://www.FreeBSD.org Am I Evil? Yes, I Am! http://yomoli.com --lHGcFxmlz1yfXmOs Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAk3C17QACgkQForvXbEpPzSK/wCgy0KzaVqs5NDHmib8NnlBdyUl phgAoNTfMDvlX/weLtSpUz3fyPWjZorq =QJZr -----END PGP SIGNATURE----- --lHGcFxmlz1yfXmOs--
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