kern/106340: Need to control disk write cache on per-disk basis
Dieter
freebsd at sopwith.solgatos.com
Mon Dec 4 10:30:18 PST 2006
>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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