thanx munson
Kris Buelens <[email protected]> Sent by: The IBM z/VM Operating System <[email protected]> 01/28/2009 09:26 AM Please respond to The IBM z/VM Operating System <[email protected]> To [email protected] cc Subject Re: Max EDEV size? Read the z/VM performance reports. In general: with EDEVs you can sustain a somewhat higher page rate than with ECKD, but, the CPU cost to drive the paging operations is much higher per page (even with z/VM 5.3 which is better than 5.2). 2009/1/28 Bill Munson <[email protected]> Eric, What about using SCSI (edev) for z/VM PAGE packs ?? thanx Bill Munson Brown Brothers Harriman Sr. z/VM Systems Programmer 201-418-7588 President MVMUA http://www2.marist.edu/~mvmua/ Eric R Farman <[email protected]> Sent by: The IBM z/VM Operating System <[email protected]> 01/27/2009 08:39 PM Please respond to The IBM z/VM Operating System <[email protected]> To [email protected] cc Subject Re: Max EDEV size? Hi Lee, The biggest EDEV you can have is 1TB minus one page, with some exceptions depending on the application of the EDEV: DRCT, PAGE, SPOL allocations must reside in the first 64GB (minus one page) of the volume CMS volumes are technically limited to 381GB, but will be less than that in practice More explanations can be found in Chapter 22 of the CP Planning and Administration manual. http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/HCSG0B30/4.5.1?DT=20081120142224 Regards, Eric Eric Farman z/VM I/O Development IBM Endicott, NY From: Lee Stewart <[email protected]> To: [email protected] Date: 01/27/2009 07:50 PM Subject: Max EDEV size? I've looked, and maybe overlooked, but is there a maximum size for an EDEV? LUNs on a SAN can be pretty big... Anyone know if it's documented anywhere? Thanks, Lee -- Lee Stewart, Senior SE Sirius Computer Solutions Phone: (303) 798-2954 Fax: (720) 228-2321 Email: [email protected] Web: www.siriuscom.com *************************** IMPORTANT NOTE ***************************** The opinions expressed in this message and/or any attachments are those of the author and not necessarily those of Brown Brothers Harriman & Co., its subsidiaries and affiliates BBH. There is no guarantee that this message is either private or confidential, and it may have been altered by unauthorized sources without your or our knowledge. Nothing in the message is capable or intended to create any legally binding obligations on either party and it is not intended to provide legal advice. BBH accepts no responsibility for loss or damage from its use, including damage from virus. ******************************************************************* -- Kris Buelens, IBM Belgium, VM customer support *************************** IMPORTANT NOTE***************************** The opinions expressed in this message and/or any attachments are those of the author and not necessarily those of Brown Brothers Harriman & Co., its subsidiaries and affiliates ("BBH"). There is no guarantee that this message is either private or confidential, and it may have been altered by unauthorized sources without your or our knowledge. Nothing in the message is capable or intended to create any legally binding obligations on either party and it is not intended to provide legal advice. BBH accepts no responsibility for loss or damage from its use, including damage from virus. ************************************************************************
