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姓名：雷宇
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	文章列表 - CSE

	CSE-Chapter1-An introduction to your hardware
	<DIV>I am using the word server in a broad sense here. At one time, there was a clear distinction between a server and a workstation. I think that distinction still exists but only insofar as a server usually exists in a computer-room environment and a workstation exists in the open office space. We consider a server as being any type of machine that provides a computing resource for one person or 1,000 people.</DIV> <DIV> </DIV> <DIV>HP servers can be considered to employ either a Precision Architecture or Itanium architecture. <BR></DIV> <DIV>The current PA-RISC servers can accommodate 64 processors and 256GB of RAM utilizing the PA-8700+ processor. In the near future, the PA-8800 processor will be able to run at speeds in excess of 1GHz and support a memory compliment of 512GB and beyond.The future looks secure for the PA-RISC processor.</DIV> <DIV>The current crop of Itanium processors (Itanium2) is operating at 1.5GHz and supports a 512GB memory compliment. Like their PA-RISC cousins, the Itanium2-powered Integrity Superdome servers are smashing performance benchmarks wherever they go.</DIV> <DIV> </DIV> <DIV>The scheduling of tasks on the processor is a job for the kernel. The kernel has at its disposal up to four basic schedulers to help with this task: the POSIX real-time scheduler, the HPUX real-time scheduler, the HPUX timesharing scheduler, and the PRM scheduler.</DIV> <DIV> </DIV> <DIV>HP-UX employs a virtual memory system that is underpinned by the concept of paging and swapping. In practice, the idea of swapping a process out of memory is too expensive as far as the IO subsystem is concered. Nowadays most virtual memory systems are paging systems, even though we still talk about swap space. </DIV> <DIV> </DIV> <DIV>The actual mapping of a virtual address to a physical address is accomplished by special hardware components including the Translation Lookaside Buffer(TLB) and a special hashed table in the kernel that maps vir……
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	发表于:2006-10-08 ┆ 阅读(1110) ┆ 评论(0)

	The ways to change the MAC address
	<DIV>1,Replace the offending card to ensure that the MAC address is now unique; this is counter-productive where we want to maintain the old MAC address for licensing/application considerations<BR>2,Change the MAC address via 'lanadmin'</DIV> <DIV> </DIV> <DIV>The first solution is a little drastic, but for many corporations it is a reasonable request of a hardware vendor to supply components that are operational. I know of many sites that will return LAN cards to the vendor if a duplicate MAC address is discovered. The second solution seems more resonable but is not entirely fool proof. Some licensing software will use the MAC address programmed into the LAN card, so changing the MAC address as described in solution 2 above is not actually changing the programmed MAC address on the LAN card. The lanadmin command is simply setting up a kernel structure that translates the old MAC address to a new MAC address. There is another problem with using solution 2 above; What if you choose a MAC address that conflicts with an existing or future valid MAC address? This has to be considered before proceeding. Should we choose solution 2, there are some considerations before undertaking what is in effect a relatively simple task:<BR> a. Decide on the new MAC address<BR> b. Set up the corresponding startup configuration file to specify the new MAC address<BR> c. Change the MAC address by rebooting or running the lanadmin command manually<BR></DIV> <DIV></DIV>
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	发表于:2006-08-07 ┆ 阅读(848) ┆ 评论(0)