From: Bob Vance (bobvance@alumni.caltech.edu)
Date: Thu Jul 10 2003 - 14:20:41 EDT
I had also called HP pre-sales support about this and they said that they
did not know but would forward it on to "engineering". In the meantime,
"engineering" replied back that it would not work!!
Here is what I got back:
---- I just got this back from engineering... We have run a quick test of this scenario and found that data backed up on PA-Risk systems will NOT restore to IPF systems. In our test we backed up some image data from a PA-Risc system then moved the tape drive and media to an IPF system and recovered the images. These images are not viewable on the IPF system. I would assume that if there is a difference in endian with PA-Risc and IPF that the bytes are not being recovered in the same order as the PA-Risk system would have required. It looks as though without a special tool to do the byte swapping, media created with PA-Risc systems is not compatible with IPF systems. Although the media is recognized by both architectures the data created by the backup tool would need to be smart enough to know which system the recovery is targeted for. I can not answer whether 'swpackage' is capable of knowing when to use big-endian or small-endian when creating and restoring data from tape. Without this functionality, this capability what is being asked below is not possible. ---- --------------------------------------------------------- Tks <mailto:BVance@sbm.com> BV <mailto:BobVance@alumni.caltech.edu> Sr. Technical Consultant Vox 770-623-3430 Arrow Electronics, Inc. Fax 801-327-6152 Enterprise Computing Solutions SBM Division 11455 Lakefield Dr. Duluth, GA 30097-1511 ========================================================= -----Original Message----- From: Bob Vance Sent: Thursday, July 10, 2003 2:10 PM To: hplst Subject: RE: [HPADM] SUMMARY: Itanium/PArisc tape format compatibility I just realized that I wasn't complete in my attribution in my SUMMARY. "Bill" is, of course, Bill Hassell. --------------------------------------------------------- Tks <mailto:BVance@sbm.com> BV <mailto:BobVance@alumni.caltech.edu> Sr. Technical Consultant Vox 770-623-3430 Arrow Electronics, Inc. Fax 801-327-6152 Enterprise Computing Solutions SBM Division 11455 Lakefield Dr. Duluth, GA 30097-1511 ========================================================= -----Original Message----- From: hpux-admin-owner@DutchWorks.nl [mailto:hpux-admin-owner@DutchWorks.nl]On Behalf Of Bob Vance Sent: Wednesday, July 09, 2003 11:19 AM To: hpux-admin@DutchWorks.nl Subject: [HPADM] SUMMARY: Itanium/PArisc tape format compatibility (Original post at end) Thanks to Martin [mailto:lodahl@foothill.net] Bill It seems that I'll be OK. When running HP-UX on Itanium, the byte order is changed (Itanium supports both byte orders) to the same as for PArisc so it "just works". REPLIES: --- from Martin Don't worry about it, it will work. Everything you've mentioned is running at an application level, and bit-ordering is only an issue down at the bare metal. The IA64 chip itself is bi-endian, and actually changes bit order during the process of booting HP-UX. Once HP-UX is up, ordering is no longer an issue. I've moved files between the two architectures by a lot of methods, and have never had a problem. SD-UX, however, changed formats between 10.X and 11.X so you may have some issues there, but they'll be the same issues you'd have on PA-RISC. -Martin (The issue raised here about SD formats is benign for me. The depots are maintained in their native platform formats. This is a special implementation of Ignite provided by HP because we are a distributor. I've created 'swpackage' depots for 10.20, 11.00, 11.11 and they work fine. -bob ) --- from Bill The short answer is: yes Itanium is a unique that supports both endians. If you run HP-UX on Itanium then the resultant files will be restored the same way (and will be copmpatible) on the Itanium box running HP-UX. The long answer is probably somewhere on the HP website as it discusses IA-64 features. A quick search for itanium endian does find a lot of docs. The big/little-endian setting is set by the opsystem as it loads/runs. That's a requirement for Itanium opsystem design (Linux, Windows, HP-UX). All of these opsystems are heavily customized at a very low level to run on Itanium. --------------------------------------------------------- Tks <mailto:BVance@sbm.com> BV <mailto:BobVance@alumni.caltech.edu> Sr. Technical Consultant Vox 770-623-3430 Arrow Electronics, Inc. Fax 801-327-6152 Enterprise Computing Solutions SBM Division 11455 Lakefield Dr. Duluth, GA 30097-1511 ========================================================= -----Original Message----- From: hpux-admin-owner@DutchWorks.nl [mailto:hpux-admin-owner@DutchWorks.nl]On Behalf Of Bob Vance Sent: Wednesday, July 09, 2003 9:24 AM To: hpux-admin@DutchWorks.nl Subject: [HPADM] Itanium/PArisc tape format compatibility I'm worried about byte order of the data. The simple question is: Generally, can I create a tape under PArisc HP-UX 10.20 (or 11.00 or 11.11) and then restore it correctly on an Itanium box running HP-UX 11.22. Will 'tar', 'cpio', 'fbackup' be compatible in this scenario? More specifically, We have the Itanium Ignite depots for HP-UX 11.22 (along with the PArisc depots for 10.20, 11.00, 11.11) on 2 PArisc boxes (running 10.20, as mandated by HP manufacturing). I can create a 'swinstall' tape from those 11.22 depots using 'swpackage'. However, my worry is byte-order on the tape created by 'swpackage' running under HP-UX for PArisc (10.20). Since we don't have an IPF box, I can't be sure that the tape created under PArisc HP-UX will actually work under IPF HP-UX. I'm guessing that it will work, since the Ignite process/depots should be able to ignite an Itanium box. --------------------------------------------------------- Tks <mailto:BVance@sbm.com> BV <mailto:BobVance@alumni.caltech.edu> Sr. Technical Consultant Vox 770-623-3430 Arrow Electronics, Inc. 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