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тАО06-29-2001 09:36 AM
тАО06-29-2001 09:36 AM
I've read the 8/1/1997 post concerning this same topic (http://us-support.external.hp.com/cki/bin/doc.pl/sid=d650954b0029172f9a/screen=ckiDisplayDocument?docId=200000024628464), but since it's rather old, I wanted to confirm that this is still valid as of a new L-Class running HP-UX 11.00.
I assume most people mirror their swap areas (if they're using mirroring elsewhere) -- is this true?
Thanks,
~Fred Claypool, Jr.
Solved! Go to Solution.
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тАО06-29-2001 09:45 AM
тАО06-29-2001 09:45 AM
SolutionYes I do mirror swap. If the disk that your swap lv is on crashes, you still want to be able to function. Primary swap is just another component of the root VG that should be mirrored. If you lose a root disk, and don't have swap mirrored, you could really be in trouble.
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тАО06-29-2001 09:50 AM
тАО06-29-2001 09:50 AM
Re: Can I Mirror A Dump Area?
Thanks for the quick response. You've answered my original question, but I've got a follow-up, just to satisfy my own curiosity.
In the event that the "dump" function really has to be called, and all of that data you mentioned gets written to my lvol, would I have any tools to read it, or would that be something only HP/Response or our HP engineers would use?
Thanks.
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тАО06-29-2001 09:59 AM
тАО06-29-2001 09:59 AM
Re: Can I Mirror A Dump Area?
System panics, and memory is written to the dump area. On reboot the system looks to see if there is a dump data in the dump area, if so, it is then read from the dump area and written to /var/adm/crash. The files in /var/adm/crash are compressed. From there, there area things that you can do, I believe with the q4 utiltiy located in /usr/contrib/bin. If you know how to use that utility you can analyze the dump. I've used it once and that was with the guidance of an engineer from the Response Center.
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тАО06-29-2001 01:06 PM
тАО06-29-2001 01:06 PM
Re: Can I Mirror A Dump Area?
DocID OZBEKBRC00000611 explains how to use Q4 to prepare system dump files.
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тАО06-29-2001 03:06 PM
тАО06-29-2001 03:06 PM
Re: Can I Mirror A Dump Area?
The Response Center can analyze the crash dump and compare the signatures with thousands of crash listings to determine a cause. In the worst case, the engineer would have to gather all the related source code plus any patch source code that applies and walk through the dump...a very labor intensive task.
Bill Hassell, sysadmin