Date: Tue, 03 Feb 2026 19:11:12 +0000 From: Alexander Ziaee <ziaee@FreeBSD.org> To: doc-committers@FreeBSD.org, dev-commits-doc-all@FreeBSD.org Cc: Garett Boone <freebsd@gbtechlab.com> Subject: git: 096c63bb9b - main - handbook/zfs: Fix vfs.zfs.prefetch.disable sysctl Message-ID: <69824850.332a0.2a5ca3bb@gitrepo.freebsd.org>
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The branch main has been updated by ziaee: URL: https://cgit.FreeBSD.org/doc/commit/?id=096c63bb9bc238d963d2f2883226354a940dbc74 commit 096c63bb9bc238d963d2f2883226354a940dbc74 Author: Garett Boone <freebsd@gbtechlab.com> AuthorDate: 2025-09-27 03:14:32 +0000 Commit: Alexander Ziaee <ziaee@FreeBSD.org> CommitDate: 2026-02-03 19:11:00 +0000 handbook/zfs: Fix vfs.zfs.prefetch.disable sysctl Reviewed by: ziaee Closes: https://github.com/freebsd/freebsd-doc/pull/554 --- documentation/content/en/books/handbook/zfs/_index.adoc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/documentation/content/en/books/handbook/zfs/_index.adoc b/documentation/content/en/books/handbook/zfs/_index.adoc index 36e79b2308..22d41f6468 100644 --- a/documentation/content/en/books/handbook/zfs/_index.adoc +++ b/documentation/content/en/books/handbook/zfs/_index.adoc @@ -2671,7 +2671,7 @@ Future disks use 4 KB sectors, and `ashift` values cannot change after creating In some specific cases, the smaller 512-byte block size might be preferable. When used with 512-byte disks for databases or as storage for virtual machines, less data transfers during small random reads. This can provide better performance when using a smaller ZFS record size. -* [[zfs-advanced-tuning-prefetch_disable]] `_vfs.zfs.prefetch_disable_` - +* [[zfs-advanced-tuning-prefetch_disable]] `_vfs.zfs.prefetch.disable_` - Disable prefetch. A value of `0` enables and `1` disables it. The default is `0`, unless the system has less than 4 GB of RAM. Prefetch works by reading larger blocks than requested into the crossref:zfs[zfs-term-arc,ARC] in hopes to soon need the data. If the workload has a large number of random reads, disabling prefetch may actually improve performance by reducing unnecessary reads. Adjust this value at any time with man:sysctl[8].home | help
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