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Doc: improve mkdumprd man page 

Currently, when generating a kdump initramfs, mkdumprd will determine
how much disk space is available, if the dump target's available space
is not greater than the total system memory, mkdumprd will print a
warning to remind that there might not be enough space to save a vmcore.

Some users are complaining that mkdumprd overestimates the needed size.
But actually, the warning covers extreme scenarios such as the slab
explodes with non-zero data or a full vmcore, etc. Therefore, need to
prevent users from having minimum disk space for crash dump.

In view of this, add some descriptions to clarify it in mkdumprd man
page.

Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
Acked-by: Kairui Song <kasong@redhat.com>
This commit is contained in:
Lianbo Jiang 2020-12-11 11:37:29 +08:00 committed by Kairui Song
parent ad6a93b00d
commit cd7264705d
1 changed files with 7 additions and 1 deletions
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8
mkdumprd.8
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@ -15,7 +15,13 @@ be loaded in the initramfs (based on configuration retrieved from
\fI/etc/kdump.conf)\fR
\fBmkdumprd\fR add a new \fBdracut\fR module 99kdumpbase and use \fBdracut\fR
utility to generate the initramfs.
utility to generate the initramfs. When generating a kdump initramfs, \fBmkdumprd\fR
will determine how much disk space is available, if the dump target's available
space is not greater than the total system memory, \fBmkdumprd\fR will print a
warning to remind that there might not be enough space to save a vmcore. The
warning covers extreme scenarios such as the slab explodes with non-zero data or
a full vmcore, etc. Therefore, need to prevent users from having minimum disk
space for crash dump.
\fBmkdumprd\fR was not intended for casual use outside of the service
initialization script for the kdump utility, and should not be run manually. If