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Date:      Thu, 24 May 2001 01:10:39 +0200 (CEST)
From:      sec@ice.42.org
To:        FreeBSD-gnats-submit@freebsd.org
Subject:   docs/27599: md(4) manpage enhancement
Message-ID:  <20010523231039.C3E5B2DC@ice.42.org>

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>Number:         27599
>Category:       docs
>Synopsis:       md(4) manpage enhancement
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-doc
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 23 16:20:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Stefan `Sec` Zehl
>Release:        FreeBSD 4.3-STABLE i386
>Organization:
>Environment:
System: FreeBSD ice 4.3-STABLE FreeBSD 4.3-STABLE #5: Mon May 21 23:19:31 CEST 2001 root@ice:/usr/export/obj/usr/export/src/sys/ICE i386


	
>Description:

I found out that the hard way that a malloc(9)-backed md(4) disk has a
certain maximum size. If you increase it beyond that, your system will
hang. (See discussion with phk, kern/27259).

I hope my manpage update (or something similar) can be added, so
other users won't run into the same problem.

>How-To-Repeat:
	
>Fix:

Add this note to the manpage.

--- /usr/export/src/share/man/man4/md.4	Sun Dec 31 03:11:56 2000
+++ ./md.4	Thu May 24 00:56:57 2001
@@ -59,6 +59,11 @@
 with the kernel option
 .Dv MD_NSECT .
 .Pp
+Be warned that due to kernel constraints such a
+.Nm
+disk cannot be bigger than a certain maximum size.
+This size can be found in the 'Limit' column of 'vmstat -m'.
+.Pp
 At boot time the
 .Nm
 driver will search for pre-loaded modules of type

>Release-Note:
>Audit-Trail:
>Unformatted:

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