what is recommended dump level
by Tokuhisa Inagaki
Hi, all.
what is recommended dump level when using makedumpfile
(kdump)? I'm looking for explanation like this.
------------ from diskdump document --------------------
Note that the partial dump feature has some risks. There
are memory management lists which are scanned for a page's
memory attribute, so if the list has been corrupted, the
scanning process may fail. For example, when specifying a
dump_level from 4-7 or from 12-15, the kernel's free page
linked lists are scanned; if the list is corrupt, diskdump
may hang. Furthermore, it is possible that a page type
that has been skipped may be necessary to fully investigate
the cause of some issues. Therefore, a memory collection
level should be selected to suit each situation. The
recommended level is 19, because it is easiest to determine
whether a page is zero-filled or if it is a page cache page,
and because no page lists need to be traversed.
-------------------------------------------------------
Does anyone know document describing these things
when using makedumpfile ?
Thanks,
toku.
15 years, 5 months
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