Russell Witt wrote:
Yes, IBM does do the IDRC compression before they do the encryption. That is one of the advantages over the CPACF encryption that is done by the encryption products running on the mainframe itself.
<snip>
The Encryption Facility can use HW-based compression before encryption, all on the server. (One has to specify its use because there is no way to uncompress the data on a non-z server.) I think that at least one other vendor's product does this, too (perhaps even CA's but I have lost track of which is which).
Having said that, the compression algorithm used by the tape controllers is somewhat better than the one used on the servers.
-- John Eells z/OS Technical Marketing IBM Poughkeepsie [EMAIL PROTECTED] ---------------------------------------------------------------------- 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
