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* Clarify text on choosing a dump device

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* Remove the text which states only devices with minor number 1 can be used
  - this is no longer true.
* Mention that dumpon(8) cannot be used to capture dumps from panics during
  kernel initialization.
* /dev/wd -> /dev/ad

PR:		19848
Submitted by:	Udo Erdelhoff <ue@nathan.ruhr.de>
Reviewed by:	sheldonh
This commit is contained in:
Ben Smithurst 2000-07-14 18:04:39 +00:00
parent d191a99c2e
commit d9a9b8dbb6
1 changed files with 17 additions and 7 deletions
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24
sbin/dumpon/dumpon.8
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@ -68,8 +68,16 @@ flag causes
.Nm
to be verbose about its activity.
.Sh NOTES
One of the system swap devices is usually chosen as the dump device, as
swap devices are the most likely to have the required space at dump time.
Since a
.Xr panic 9
condition may occur in a situation
where the kernel cannot trust its internal representation
of the state of any given filesystem,
one of the system swap devices,
and
.Em not
a device containing a filesystem,
should be used as the dump device.
.Pp
The
.Nm
@ -96,8 +104,8 @@ is the text string:
.Xr swapon 8 ,
.Xr panic 9
.Sh FILES
.Bl -tag -width "/dev/{wd,da}?s?b" -compact
.It Pa /dev/{wd,da}?s?b
.Bl -tag -width "/dev/{ad,da}?s?b" -compact
.It Pa /dev/{ad,da}?s?b
standard swap areas
.It Pa /etc/rc.conf
boot-time system configuration
@ -106,9 +114,11 @@ boot-time system configuration
Because the filesystem layer is already dead by the time a crash dump
is taken, it is not possible to send crash dumps directly to a file.
.Pp
.Nm Dumpon
currently allows only devices with minor number 1 to be used as dump
devices.
Since
.Nm
can only be called after the system enters single-user mode,
it can not be used to create dumps
for system panics during kernel initialization.
.Sh HISTORY
The
.Nm