To: Gary.Franco@emulex.com Cc: owner-t10@t10.org, t10@t10.org Subject: Re: Differences between WRPROTECT and VRPROTECT From: George Penokie <gop@us.ibm.com> Date: Mon, 20 Nov 2006 17:21:37 -0600 X-Message-Number: 7394 Formatted message: HTML-formatted message Gary, There is no data written to the media with a VERIFY command. There is data sent to the device that is only to be compared with what is already on the media if the BYTCHK bit set to one. In that case the protection information moved with the data from the initiator to the target is used to check the data that is sent based on the requirements listed in table 64. The corresponding data is read of the disk and is checked using protection information read from the media with the data as defined in table 63. Then the data from the initiator and the data read from the media is byte checked and the protection information is byte checked as defined in table 65. Bye for now, George Penokie Dept 9A8 030-3 A410 E-Mail: gop@us.ibm.com Internal: 553-5208 External: 507-253-5208 Gary.Franco@Emulex.Com Sent by: owner-t10@t10.org 11/20/2006 02:11 PM To <t10@t10.org> cc Subject Differences between WRPROTECT and VRPROTECT Is it the specification or my lack of understanding ? here is the issue: Isn?t a VERIFY for all intents and purposes the same as a WRITE command as the DATA is sent to the device for verification. In a WRITE command if the WRPROTECT bits are 000 (no protection data available) the target device create its own protection information and writes it to the disk. This same operation is not called out for the VERIFY, therefore wouldn?t all the checks fail by default? __________________________________ Gary Franco Consultant Engineer Emulex Network Systems 972-671-7433 Dallas Office 972-671-7435 Dallas Office Fax 720-652-6387 Longmont Colorado Office 720-494-1817 Longmont Colorado Office Fax 972-839-5694 Cell Phone Today's Quote Be who you are and say what you feel because those who mind don't matter and those who matter don't mind. -Dr. Seuss This message contains confidential information of Emulex Corporation intended only for listed recipients and should not be forwarded to anyone else. If you have received this message in error, please delete it immediately. Thank you.