40g transceiver

Fault description of the sudden loss of application software in linux: a small system found that the application software was deleted in the morning and the system could not run normally. the related personnel found that the OS version was RHEL61, after logging on to the host, we found that devsdb1 mounted two file systems at the same time. Note that tmp was also mounted. [fault description of the sudden loss of application software in linux: a small system found that the application software wa

type; Fdisk-l Fdisk/dev/sda, enter "n" to create a partition, "p" to view the partition, "t" to change the partition type, and "w" to save the modification. 2) create a physical volume: The volume can be created only on the new LVM partition. Pvdisplay/dev/sda2 Pvcreate/dev/sda2 3) create a volume group using a physical volume: The volume group can contain multiple physical volumes or use only one physical volume. Vgcreate myVG/dev/sda2 4) create a logical volume in the volume group Lvcreate-L

Operating software environment: CentOS4.4, TSM5.3.2, ORACLE10G Environment: A broken PC, P3900Mhz, M memory, 40g hard drive, and a obsolete HPD Operating software environment: CentOS 4.4, TSM5.3.2, ORACLE 10G Environment: A broken PC, P3 900 Mhz, M memory, 40G hard drive, a obsolete HP D Operating software environment: CentOS 4.4, TSM5.3.2, Oracle 10G Environment: One broken PC, P3 900 Mhz, M memory, 4

requirements, and the data center is de-stacked. Third, the basic network changes from L2 forwarding to L3 forwarding. In L2 Networks, broadcast storms or loops often occur. Using a layer-3 approach can not only reduce loops, but also improve network bandwidth utilization. Although the three-tier network configuration is complex, it can be deployed automatically through the Controller. As long as the port of the network device is connected through a cable, all network configurations are automat

Flags: [U] User SID: S-1-5-21-1442997883-3833565404-3457035396-1002 Primary Group SID: S-1-5-21-1442997883-3833565404-3457035396-513 Iii. Test (the Server IP address is 192.168.1.24) 1. linux OS testing [Root @ localhost ~] # Smbclient-L // 192.168.1.24-U smb2 Enter smb2's password: Domain = [MYGROUP] OS = [Unix] Server = [Samba 3.6.9-164. el6] Sharename Type Comment -------------------- Wxwsmb Disk user public directory IPC $ IPC Service (MY Samba Server Version 3.6.9-164. el6) Smb2 Disk home

partition: StartFor: Select "EXT4 log File System"mount point:/boot.8. Set the partition, the next step is very key!!!Install the device that starts the boot area drop-down option box select the area that you must select to be divided into/bootFinal language selection: Shanghai, keyboard layout: English, American9. After the removal of the USB flash drive reboot, you will find the direct access to your Windows system, because we have its boot into the/boot partition. Use EASYBCD to create a boo

---------------------------------------------------------------------------- DB_NAME STATUS -------------------- SOFTWARE_VERSION ------------------------------------------------------------ COMPATIBLE_VERSION ------------------------------------------------------------ 2 + ASM2 Asmvol CONNECTED 11.2.0.1.0 11.2.0.1.0 The group_number value of the disk group webdg is 2. This instance + ASM2 has an asmvol connection. This is a new feature in the 11g architecture. It is a logical volume created on

transformation, a special cache with parallel lookup capability can be added in the address transformation mechanism, also known as the Fast Table (TLB), which is used to store the page table entries currently accessed. The address transformation mechanism with a fast table is shown in four. Because of the cost of the relationship, the fast table can not be done very large, usually only 16~512 page table items.The above address transformation mechanism is very good for small and medium programs

rpc框架交互的接口。牵扯到两个相关于性能的细节：内存复用，与对象 复用。 信道利用： 对于一个基于tcp的框架，主要牵扯两个问题，一个是长短连接，连接复用策略，与连接管理。 了解了以上概念，剩下问题，就是如何根据用户的调用方式，编解码库实现方式，和信道利用上，最大限度提高效率。Early RPC Framework 早期的消息系统，使用的策略是： 同步调用+短连接+动态创建所有buffer+动态创建所有对象 这种方式，在初期很快的完成了原型，并且在项目初期，通信比较少情况下，稳定跑了近半年时间。 通信时序图如下： 随着业务放量，推送使用频率的增长，业务逻辑的复杂。瓶颈出现，100w连，稳定服务后，virt 50G，res 40G，左右。gc时间一 度达到3~6s，整个系统负载也比较高。(12年，1.0.3版本) 其实早期在实现的时候，选择动态创建buffer和object，也不奇怪，主要是考虑到go在run

Data center 100g/200g/400g and longer-term fiber technology evolutionApril 22, 2016 the German Rosenberg company was invited to participate in the data center work held in the Hundred lecture lectures. This issue CDCC lecture by Rosenberg data communication product line product Technical Director Mr. Sun Huiyong, he as the National Beacon Committee of Information Technology Equipment Interconnection Subcommittee expert members and China Construction Standardization Association Information and Co

①, applicable customers. Applicable to: Legendary class of dragon-like Adventure Island and other personal tourPlay, can also be applied to * * *, the vast number of corporate websites, data interchange②, domestic record "three high" server. Server free test 2-3 hours, dissatisfied without paymentHigh defense (single-line, double-wire, high-protection)High bandwidth (320G port bandwidth)It's a four-line BGP room in the new country.High-performance (second solution, open 80, stable and smooth, no

First, install Windows, from the main hard disk to separate 40G space;Second, download the Linux iOS image;Third, install the UltraISO, the download good Linux image to write to U disk;Write as write to hard disk image ' usb-hdd+ '!Four, restart the computer, F12 from the USB stick bootFive, choose ' Install system ', automatic partition, select mount point for the newly separated 40G space, set the root pa

] Server = [Samba 3.6.9-164. el6] Sharename type comment -------------------- Wxwsmb disk user public directory IPC $ IPC Service (My Samba server version 3.6.9-164. el6) Smb2 disk homes directory [[Email protected] ~] # Mount-t cifs // 192.168.1.24/smb2/mnt-O username = smb2 Password: [[Email protected] ~] # DF-H Filesystem size used avail use % mounted on /Dev/sda2 49g 5.8g 40g 13%/ Tmpfs 398 m 0 398 m 0%/dev/SHM /Dev/sda1 194 m 28 m 157 M 15%/boot

View deleted files, space has no release, no then kill PIDLsof-n |grep deletedLsof Introduction lsof (list open files) is a tool that lists open files for the current system.Problem Description:Service Alarm root partition utilization more than 95%, come up to see 96% utilization rate;650) this.width=650; "Src=" https://s3.51cto.com/wyfs02/M01/99/58/wKiom1lHd_DBY8mrAAALkx0jBwc936.png-wh_500x0-wm_ 3-wmp_4-s_384454434.png "title=" qq picture 20170609143710.png "alt=" Wkiom1lhd_dby8mraaalkx0jbwc936

, because in each case you could immediately imagine or construct a theoretical test method to prove it.2. FAT Tree Network and network level ClosTo say the fat tree concept, you can start with the architecture of the infiniband[Note 1] switch. The InfiniBand switch is prone to 288 ports (port rate 10g/20g/40g), and its chip is a fat tree to build a high-density port switch. Note The 1:infiniband architecture is a "transform cable" technology th

Today engineering side of the brother feedback a problem, LVM partition after the installation completed reboot found unable to mount and identify, host environment for SLSE11 SP3. By viewing and processing, the results are now recorded. First, online solution 1. View LV information through Lvscan The code is as follows Copy Code 111cn.net:~ # Lvscan inactive '/dev/vgteas/lvteasdata ' [2.72 TiB] Inherit The discovery of LV information is inactive state.

buffers Cachedmem:128976 127808 1168 0 245 88552-/+ buffers/cache:39010 89966swap:15999 194 15805 We can see the 128G of physical memory, the cache occupies a 88G appearance at present. Linux file system cache is divided into 2 kinds: page cache and buffer Cache,page cache is used for files, Inode and other operations of the cache, and buffer cache is used for block device operation. From the data above, the cached 88552 in the free-m command we see is page cache. In fact, the memory allocatio

:/boot5, divided into a partition of 1024M, Mount point is:/opt6, divided into a 4000M partition, mount point:/tmp7, divided into a 10G partition, mount point:/Home8, divided into a 20G partition, mount point:/usr/local9, "Use all available space" divided into a zone, mount point:/var 2) The following partitions and mount points on the 160G hard disk for the server: (this is the partition and mount point settings for the physical drive, the installation of centos6.2) 1. Two 1G swap partition (m

taken from the same path, in other words, regardless of the use of one or two USB devices, the total power supply is limited to a certain range, especially for the host of poor performance or power of small power supply performance more obvious. So when we encounter more than 40G of high-speed mobile hard drive, there is often a lack of power, can not use the normal situation. At this point, even if we put two USB connectors are not able to meet the

people use the network can use a dedicated network line, not other online interference. Three. Huawei Home Router Huawei is the world's top 500 companies, of which its NE series routers are the most high-end. The ne5000e router can reach the cluster mode system of 16+64 species. At the same time also has the strength of 40G IP, with 40G capacity, to achieve consumer demand. And its design is