Date: Wed, 9 Oct 2019 11:34:16 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r353341 - head/cddl/contrib/opensolaris/cmd/zpool Message-ID: <201910091134.x99BYG5h088252@repo.freebsd.org>
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Author: avg Date: Wed Oct 9 11:34:16 2019 New Revision: 353341 URL: https://svnweb.freebsd.org/changeset/base/353341 Log: zfs: document large_dnode feature The text is copied from illumos. The conversion to mdoc is mine. The FreeBSD boot warning is copied from large_block description. MFC after: 4 days Modified: head/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7 Modified: head/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7 ============================================================================== --- head/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7 Wed Oct 9 11:26:36 2019 (r353340) +++ head/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7 Wed Oct 9 11:34:16 2019 (r353341) @@ -527,6 +527,36 @@ Please note that booting from datasets that have recor supported by the .Fx boot loader. +.It Sy large_dnode +.Bl -column "READ\-ONLY COMPATIBLE" "org.zfsonlinux:large_dnode" +.It GUID Ta org.zfsonlinux:large_dnode +.It READ\-ONLY COMPATIBLE Ta no +.It DEPENDENCIES Ta extensible_dataset +.El +.Pp +The +.Sy large_dnode +feature allows the size of dnodes in a dataset to be set larger than 512B. +.Pp +This feature becomes +.Sy active +once a dataset contains an object with a dnode larger than 512B, +which occurs as a result of setting the +.Sy dnodesize +dataset property to a value other than +.Sy legacy . +The feature will return to being +.Sy enabled +once all filesystems that have ever contained a dnode larger than 512B are +destroyed. +Large dnodes allow more data to be stored in the bonus buffer, thus potentially +improving performance by avoiding the use of spill blocks. +.Pp +Please note that booting from datasets that have dnodes larger than 512B is +.Em NOT +supported by the +.Fx +boot loader. .It Sy sha512 .Bl -column "READ\-ONLY COMPATIBLE" "org.illumos:sha512" .It GUID Ta org.illumos:sha512
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