Date: Mon, 4 Dec 2006 18:27:51 GMT From: Dieter<freebsd@sopwith.solgatos.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/106340: Need to control disk write cache on per-disk basis Message-ID: <200612041827.kB4IRpQb056456@www.freebsd.org> Resent-Message-ID: <200612041830.kB4IUGGe093459@freefall.freebsd.org>
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>Number: 106340 >Category: kern >Synopsis: Need to control disk write cache on per-disk basis >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: change-request >Submitter-Id: current-users >Arrival-Date: Mon Dec 04 18:30:14 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Dieter >Release: 6.0 >Organization: >Environment: >Description: FreeBSD only allows setting disk write cache mode on a system wide basis, and only at boot time. NetBSD allows setting the disk write cache mode of each disk individually, and does not require a reboot. See the NetBSD dkctl(8) man page. There are many times it would be very useful to be able to put one disk into write-back mode and get the 10x speedup. But we cannot do this in FreeBSD because putting all the filesystems at risk of getting scrambled is unacceptable. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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