On Thu, 2 Dec 2010 12:09:23 -0500, Tony Harminc wrote: >On 2 December 2010 05:53, Ron Hawkins wrote: >> >> The saving in hardware assisted compression is in >>decompression - when you read it. Look at what should be a >>much lower CPU cost to decompress the files during restore >>and decide if the speed of restoring the data concurrently is >>worth the increase in CPU required to back it up in the first place. > >I am a little surprised at this.... > >But regardless, surely it is a strange claim that an installation >would use hardware assisted compression in order to make their >restores faster, particularly at the expense of their dumps.
Increased CPU time to do the dump does not necessarily mean that the elapsed time is longer. In fact, by compressing the data, I would expect that the time required to write it out (the I/O time) would be less. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
