Datacenter Crash (Server Unreachable for About 17 minutes)


 
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Special Forums Cybersecurity Datacenter Crash (Server Unreachable for About 17 minutes)
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Old 02-26-2020
Thanks for sharing your miseries....


This has been a real PITA.....

I have written some very stern lectures to S4Y, telling them what I think about not notifying customers about data center upgrades; and for doing this during the week and not during the weekend, etc.

Their sales teams have expressed similar frustration, as I was not the only customer in the data center to be outraged at these two unschedule, unannounced, outages within 24 hours.

What the "heck" were they thinking?

What they said was "we did not think there would be a problem, sorry"; but when I used to run data centers back in the old days, we approached upgrades as
  1. Anything that can go wrong will"
  2. Schedule for the weekends and plan well in advance and
  3. Notify all customers who might be effected many days in advance.

I thought this was standard practice in all data centers!
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expand_dump(8)						      System Manager's Manual						    expand_dump(8)

NAME
expand_dump - Produces a non-compressed kernel crash dump file SYNOPSIS
/usr/sbin/expand_dump input-file output-file DESCRIPTION
By default, kernel crash dump files (vmzcore.#) are compressed during the crash dump. Compressed core files can be examined by the latest versions of debugging tools that have been recompiled to support compressed crash dump files. However, not all debugging tools may be upgraded on a given system, or you may want to examine a crash dump from a remote system using an older version of a tool. The expand_dump utility produces a file that can be read by tools that have not been upgraded to support compressed crash dump files. This non-compressed version can also be read by any upgraded tool. This utility can only be used with compressed crash dump files, and does not support any other form of compressed file. You cannot use other decompression tools such as compress, gzip, or zip on a compressed crash dump file. Note that the non-compressed file will require significantly more disk storage space as it is possible to achieve compression ratios of up to 60:1. Check the available disk space before running expand_dump and estimate the size of the non-compressed file as follows: Run tests by halting your system and forcing a crash as described in the Kernel Debugging manual. Use an upgraded debugger to determine the value of the variable dumpsize. Multiply this vale by the 8Kb page size to approximate the required disk space of the non-compressed crash-dump. Run expand_dump and pipe the output file to /dev/null, noting the size of the file that is printed when expand_dump completes its task. RETURN VALUES
Successful completion of the decompression. The user did not supply the correct number of command line arguments. The input file could not be read. The input file is not a compressed dump, or is corrupted. The output file could not be created or opened for writing and truncated. There was some problem writing to the output file (probably a full disk). The input file is not formated consistantly. It is probably corrupted. The input file could not be correctly decompressed. It is probably corrupted. EXAMPLES
expand_dump vmzcore.4 vmcore.4 SEE ALSO
Commands: dbx(1), kdbx(8), ladebug(1), savecore(8) Kernel Debugging System Administration expand_dump(8)