Collect all hardware information about RD2 department and submit the form to Jack Wang, who is the new storehouse manager. The following days I will study VMware Enterprise Server and try to deploy it to apply in our general working.
Today is the final day of 2007. In the past 2007, I took RHCE exam in January, later resigned from Plasmon and returned to Shenzhen in April. I was married in December 25th. The main work in 2007 is, researching NFSv4 in Plasmon, CentOS4.5/BA880 study, and focusing on ONStor Bobcat 2280 between September and October. In the following days, act as interface of R&D department, who is response of communication with other departments and Inventec guys.
In the coming 2008, I plan to improve my oral English and listening ability in the first three months, and CCNA is also included in my study schedule.
Happy new year, and wish my family well, wish all my friends well.
I’m going to marry Yang Juan in December 25th. This is the most important thing in my 2007. Marriage means many things, grow up and fright as a real man, and have to thing about more deeply. Or I need to change some ways or methods for general communicate, not make others felt be enforced and pressed. Try to speak slowly and become more kindly. Read more book about Chinese culture. Insist on doing hearing exercise everyday. Be a man, protect my home, and all my love.
In the morning, I had a meeting with Shan Xiaoyu(new comer in product department) and a testing engineer, Hou Xianghua. First off, I reviewed the BX1200 development process and pointed out something should be carefully concerted about. UIT OS installed in BX1200 is 2.6 kernel while the third party video-monitor software is implemented in 2.4 kernel before(RHEL 3.0 and Red Hat 9.0), so it seems to have to re-compile the codes in our 2.6 kernel to ensure it can run smoothly based on BX1200. Gavin told me, he wants the BX1200 becomes a general platform, either of end users or the software company who will integrate their monitor program and get benefit by reselling BX1200. UIT OS has not X-Windows, so it is not possible to view graphics in BX1200 console. The last point we must confirm is the Web management port. The current Web port(NAS/iSCSI) is 80, which should not be duplicated with Video-Monitoring programs.
SS2280 always annoys me. I found the platforms shipped in November 8th, have not riser card in the chassis. However, in the earlier box we got in October, it is implemented with two riser cards(full-length and half-length). As the result, we can not insert Intel 1000Mb Ethernet card in SS2280. I’ve reported this situation to Tobey Chan, QE from Inventec.
Tan yinhong said during his performance testing on BX1200, one network ports can get the best performance nearly about 1Gbps, while two ports still retain the same level. Obviously the result is not reasonable. The latest news I got from him, maybe it is caused by the re-direct codes. I call Inventec technical engineer, York Chen. The kindly man told me the two ports in SS2280 both have dedicated bus connected with ESB2 south bridge. Hmm, It sounds I have to validate the actual network bandwidth in tomorrow.
In order to resolve UT issue, mounting big volumes is very slowly and the customer set the maximum time no more than 3 seconds. In fact, we find that every mount version on 2.6 kernel will mount the volumes very quickly. However, if the kernel is 2.4, it is expected to have pain. We do not want to modify our code in kernel level, so that have to test the whole system performance when nfsd is running, though usually 4-8 nfsd threads are default. The only reason is single nfsd thread could not cause “dlm_sendd” eat all the CPU resources.
Five servers which implemented with Gigabyte network device, and all the cables are connected to a dedicated Cisco switch in order to avoid network traffic. Every server held 10-12 iozone threads to write data across two NAS 880 nodes. The performance is quite good,single node “bo” is around 25MBps, and during the 3 hours continuous iozone pressure testing the node CPUs usually have high free idles.
It seems the single nfsd would resolve the UT issue now. However, I need confirmation and agreement from Gavin Huang. Thanks Lin Peng and Zhu Feng, you have done great job all these days.
Inventec issue: Their engineers will arrive Shenzhen tomorrow morning to fix SS2280 platforms.
OEM: Original Equipment Manufactor
FRU: Field Replacable Unit
BMC: Baseboard Management Controller
EEPROM: Electronically Erasable Programable Read Only Memory
NMI: Non Maskable Interrupt
It is not Linux, Linux is the kernel. A proprietary application, whether running on Linux or some other Operating System, could of course violate somebody’s patents. That has nothing at all to do with Linux.
Ah the old “Linux” means only the kernel argument. Really, the way that most people position Linux is that there is a Linux Kernel, and a Linux distribution. Linux can refer to either.
What is Microsoft? Microfibre Soft Toilet Tissue.
Kyocera Mita needs to license anything it probobly has something to do with Microsoft network file/printing sharing protocols, licensing fonts or Active Directory integration which has nothing to do with Linux. So what are these features and how will they equate into benefits to be consumer.
Touted as the “biggest advancement in fundamental transistor design in 40 years”, the new 45nm High-K process is what makes the new core possible. This technology allows for further CPU die shrinkage while reducing electrical leakage. This leakage is generally responsible for excess heat generation and power consumption, what is ultimately means for Intel processor is great transistor density, low transistor switch power, faster transistor switching speed, and overall better thermal and power efficiency. For the consumer, this will increase the speed of future processors, allow Intel to add new features, and lower cost due to a high density of chips per manufactured process wafer.
Regardless of what impact the deal has triggered in the marketplace over the past year, ultimately it’s about meeting market requirements. Instead, they want to be able to better and more easily manage their IT assets no matter what hardware or OS platforms.
If you make it through the CCNA and are still interested in Cisco and internetworking, you’re headed down a path to certain success. To learn every bit of the material covered in this book, you’ll have to apply yourself regularly, and discipline. Try to set aside the same time every day to study, and select a comfortable and quiet place to do so. If you work hard, you will be surprised at how quickly you learn this material. Arrive early at the exam center so you can relax and review your study materials.
Since there are a bunch of different types of devices specified at the different layers of the OSI model, it’s also very important to understand the many types of cables and connectors used for connecting all those devices to a networks.
Hub, also called multi-port repeater, does not segment a network; they just connect network segments together. MAC address, known as a hardware address, is burned right into the network card.
Switches aren’t used to create internetworks, they do not break up broadcast domain by default. They’re employed to add functionality to a network LAN. The main purpose of a switch is to make a LAN work better, to optimize its performance, providing more bandwidth for the LAN’s users. And switches don’t forward packets to other networks as routers. Instead, they only “switch” frames from one port to another within the switched network.
Switches create separate collision domains but a single broadcast domain.
Collision Domain: an Ethernet term used to describe a network scenario wherein one particular device sends a packet on a network segments, forcing every other device on that same segment to pay attention to it. At the same time, a different device tries to transmit, leading to a collision, after which both devices must retransmit, one at time. Not very efficient! This situation is typically found in a hub environment where each host segment connects to a Hub that represents only one collision domain and only one broadcast domain. By contrast, each and every port on a switch represents its own collision domain.
It’s also likely that at same point you’ll have to break up one large network into a bunch of smaller ones because user response will have dwindled to a show crawl as the network grew and grew. And with all that growth, your LAN’s traffic congestion has reached epic proportions. The answer to this is breaking up a really big network into a number of smaller ones. Something called “networking segmentation”, you do this by using device like routers, switches and bridges.
Two advantage of using routes: They don’t forward broadcast by default; They can filter the network based on Layer 3. Router function: Packet Switching/Filtering/Internetwork communication/Path selection.
Remember their routers are really switches, they’re actually what we call layer 3 switches. Switch is layer 2, switch frames.
Router, not only break up broadcast domains for every LAN interface, it will break up collision domains as well. Each port on that switch breaks up collision domains, but it’s not all good – all devices are still in the same broadcast domain. Do you remember why this can be really bad thing? Because all devices must listen to all broadcast transmitted, that’s why. And if your broadcast domains are too large, the users have less bandwidth and are required to process more broadcasts, and the network response time will slow to a level that could cause office riots.
Inventec agreed to replace two faulty platforms. I got the RMA number in this afternoon.
Zhu Feng and Lin Peng went to UT to update system with modified NFS scripts. The testing result in UT is quite different from those we got in our lab. When mount 15T volume, one node always keeps in 3s, and the other one takes about 10 seconds. If mount 11T,one node 0.04s, the other 2.5s. If mount 7.5T, one node 0.03s, the other 1.5s. For comparing, it takes about 2.5s on each node to mount 15T in our lab. Hence it seems according to UT environment, 7.5T would be the best choice as UT guys need mount operating as short as 1 second and they also want large volume(>10T). Jackie, the testing engineer in UT, did not accept the 2.5s mounting time. He told Zhu and Lin to re-install all the systems and recovery to default statues. Hence, these two guys have to go to UT tomorrow morning. Let’s wait for the result, and I think we also need to let UT know clearly, for their 2.4 kernel, our current version is the best resolution, though we will modify the latest version as 4.0.