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na_savecore - save a core dump
savecore [ -w | -s | -f | -i | -k | -l ]
savecore is meant to be called near the end of the initialization
file /etc/rc. Its function is to save the
core dump of the system (assuming one was made) and to
write the panic string to /etc/messages. savecore saves
the (compressed) core dump in the file
/etc/crash/core.n.nz (/crash/core.n.nz for NetCache) and a
smaller, minimal core file in /etc/crash/minicore.n
(/crash/minicore.n for NetCache). The value of n is
determined by the /etc/crash/bounds file.
Before savecore writes out a core image, it reads a number
from the file /etc/crash/minfree. If the number of free
kilobytes in the filesystem after saving the core would be
less than the number obtained from minfree, the core dump
is not saved. If minfree does not exist, savecore always
writes out the core file (assuming that a core dump was
taken).
savecore is done in parallel with enabling services such
as NFS. If a panic occurs prior to the completion of the
savecore then the filer will do a synchronous savecore
once it reboots.
- -w
- Starts savecore in a synchronous mode,
which blocks other processing until the
save has completed. Periodic progress
updates will be displayed on the console.
- -s
- Displays the progress of the current
savecore operation. If no save is in
progress, but an unsaved core is present, a
warning will be printed if the unsaved core
cannot fit in the root filesystem.
- -f
- If savecore fails to save an unsaved core
too many times, it will stop trying. This
flag tells savecore to ignore the unsaved
attempts, and try again. This attempt will
be made synchronously.
- -i
- Displays information about the type of
coredump that would be performed, if the
system were to panic right now. If unsaved
cores are present on the disks, this information
will be included in the output.
- -k
- Invalidates the special core area that
resides on each of the disks. Typically
this is used when a savecore command cannot
complete due to an error such as a disk
read error.
- -l
- Lists all of the saved core files currently
in the /etc/crash directory, along with the
panic string, panic time, and OS version.
- /etc/crash/core.*
- saved core files
- /etc/crash/bounds
- suffix for next core file
/etc/crash/minfree free KB in FS to maintain after
savecore
If the live filer in a cluster has the savecore command in
its /etc/rc file, it can save the cores created by its
partner when its partner crashes. The cores are saved to
the partner's /etc/crash directory.
na_partner(1), na_rc(5).
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