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HPUX and Compaq problem-urgent
Post 21279 by Perderabo on Tuesday 14th of May 2002 04:18:10 PM
05-14-2002
1) You actually are dumping a collection of bits into a structure and then you are using the individual members. If you would do what you actually said in paragraph one, there would be no problem. Breaking the data up as it arrives and storing it into the individual members is the way to go.
2) I would hope so
3) I know. You're hardly alone. But the practice still saddens me. I'll get over it.
4) You would be better off to stop thinking like that. You don't transfer a structure from one system to another. You tranfer a collection of data that might be called a frame, or a packet, or a cell, or a datagram. The data might be stored in structures at both ends. But the data comes out of the structure and is used to assemble a packet. The packet arrives at the other end. The data gets broken up and stored back into a similiar structure. I know, you want the packet to be the structure. I know it looks attractive to do that. I know it looks like it saves a lot of effort. But this why you're having trouble now.
Suppose, for a minute, that c had nothing called a structure. How would you write the code then? For the most part, that is what you should do. That would force you to code the algorithms correctly. Then go back and use structures only to organize collections of variables. That is all that structures are intended to do.
2) I would hope so
3) I know. You're hardly alone. But the practice still saddens me. I'll get over it.
4) You would be better off to stop thinking like that. You don't transfer a structure from one system to another. You tranfer a collection of data that might be called a frame, or a packet, or a cell, or a datagram. The data might be stored in structures at both ends. But the data comes out of the structure and is used to assemble a packet. The packet arrives at the other end. The data gets broken up and stored back into a similiar structure. I know, you want the packet to be the structure. I know it looks attractive to do that. I know it looks like it saves a lot of effort. But this why you're having trouble now.
Suppose, for a minute, that c had nothing called a structure. How would you write the code then? For the most part, that is what you should do. That would force you to code the algorithms correctly. Then go back and use structures only to organize collections of variables. That is all that structures are intended to do.
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ciss
CISS(4) BSD Kernel Interfaces Manual CISS(4) NAME
ciss -- HP/Compaq Smart ARRAY 5/6 RAID controllers SYNOPSIS
ciss* at pci? function ? DESCRIPTION
The ciss driver provides support for the CISS interface implemented by fifth and later generations of the HP/Compaq Smart ARRAY family of controllers. The CISS interface is defined in the document entitled CISS Command Interface for SCSI-3 Support Open Specification, Version 1.04, Valence Number 1, Compaq Computer Corporation, 2000/11/27. This driver supports several Compaq and HP controllers implementing the CISS interface, including: o Compaq Smart Array 5300 version 1 o Compaq Smart Array 5300 version 2 o Compaq Smart Array 5i version 1 o Compaq Smart Array 5i version 2 o HP Smart Array 5312 o HP Smart Array 6i o HP Smart Array 641 o HP Smart Array 642 o HP Smart Array 6400 o HP Smart Array 6400 EM o HP Smart Array E200 o HP Smart Array E200i o HP Smart Array P400 o HP Smart Array P400i o HP Smart Array P600 o HP Smart Array P800 o HP Smart Array V100 o HP Smart Array 1 through 13 These controllers support RAID 0, RAID 1, RAID 5, JBOD, and superpositions of those configurations. Although the controllers are actual RAID controllers, the ciss driver makes them look just like SCSI controllers. All RAID configuration must be done through the controllers' BIOSes. Hardware from previous generations of this product family may be supported by the cac(4) driver. SEE ALSO
bio(4), cac(4), intro(4), pci(4), scsi(4), sd(4) HISTORY
The ciss driver first appeared in NetBSD 3.1. AUTHORS
The ciss driver was written by Michael Shalayeff <mickey@openbsd.org>, and ported to NetBSD by Tonnerre Lombard <tonnerre@netbsd.org>. BSD
May 28, 2008 BSD