Date: Mon, 26 Nov 2012 11:12:26 +0100 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: "Martin Matuska" <mm@freebsd.org>, "Pawel Jakub Dawidek" <pjd@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r243524 - in head: cddl/contrib/opensolaris/cmd/ztest sys/cddl/contrib/opensolaris/uts/common/fs/zfs sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys Message-ID: <op.wodla0q38527sy@ronaldradial.versatec.local> In-Reply-To: <20121125163924.GM1460@garage.freebsd.pl> References: <201211251632.qAPGW8wd091581@svn.freebsd.org> <20121125163924.GM1460@garage.freebsd.pl>
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On Sun, 25 Nov 2012 17:39:24 +0100, Pawel Jakub Dawidek <pjd@freebsd.org> wrote: > On Sun, Nov 25, 2012 at 04:32:08PM +0000, Martin Matuska wrote: >> Author: mm >> Date: Sun Nov 25 16:32:07 2012 >> New Revision: 243524 >> URL: http://svnweb.freebsd.org/changeset/base/243524 >> >> Log: >> MFV r243013 and r243267: >> >> Import the zio nop-write improvement from Illumos. To reduce I/O, >> nop-write omits overwriting data if the checksum (cryptographically >> secure) of new data matches the checksum of existing data. >> It also saves space if snapshots are in use. >> >> It currently works only on datasets with enabled compression, disabled >> deduplication and sha256 checksums. >> >> IllumOS 13887:196932ec9e6a and 13888:7204b3392a58 >> 3236 zio nop-write > > This is a nice change, although I don't understand why it depends on > compression being turned on. It won't save any space. > This question is also discussed here. http://comments.gmane.org/gmane.os.illumos.zfs/200
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