sas fresno

and data volumes, our system should be simplified and simplified, small. System design scaleSpecify the business scale supported by the system, the capacity supported by the system, and whether the system needs to be expanded. The most valuable resources in the system are: CPU, memory, Io, and network. I/O is the most important thing. It is a short board and it is easy to appear in bottles.Refer to the following formula to design a system based on its reference, for example, to design an OLTP s

:100,500,101, 1000Noop will meet the requirements in the following order:100 (101), 10 2. CFQThe CFQ algorithm is fully written as completely fair queuing. This algorithm sorts the IP addresses of IO requests, rather than responding in the first and second order.Assume that there are the following Io request sequences:100,500,101, 1000CFQ will meet the requirements in the following order:100,101,500,100, 56In traditional SAS disks, disk seek takes a v

Test environment: Test Client A: HP dlrjg4, two dual-core CPUs, 4G Ram, two 10 k rpm sas disks for raid 1, ext3 Nginx server B: DELL R710, E5620 * 2, 32G Ram, 6 disks, 15 K RPM SAS disks, raid 1 + 0, xfs Memcached server C: DELL R710, E5620 * 2, 32G Ram, 6 disks, 15 k rpm sas disks, raid 5, ext4 Nginx: keepalive 8192 Php fpm settings: listen. backlog =-1

is implemented by WinLogon calling gina dll. gina dll provides an interactive interface to provide authentication requests for user login. Gina dll needs to output the following functions (Winlogon will call ): (1) WlxActivateUserShell: activates the User Shell program.(2) WlxDisplayLockedNotice: Allows gina dll to display the lock information.(3) WlxDisplaySASNotice: when no user logs in, Winlogon calls this function.(4) WlxDisplayStatusMessage: Winlogon calls this function with a status infor

reveal the characteristics of this algorithm. In short, when I/O occurs, if another process requests Io operations, a default 6-millisecond time will be generated to guess what the next process request Io will do. This will cause a relatively large latency for instant reading, which is very bad for database applications, and good for Web servers. This algorithm can also be simply understood as for low-speed disks, because the "Guess" is actually designed to reduce the head moving time. 4) CFQTh

system architecture layer to layer: 1,Underlying hardware layer:The most basic and important is to solve the bottleneck of the following layers of optimization; 2,Operating system layer:Selection and optimization of operating systems, file systems, and network parameters; 3,Cluster architecture layer:The business development architecture also needs to develop; 4,Data Application Layer:Mysql installation and configuration file parameter settings; 5,SQLOptimization layer:SQL statement optimizatio

Analysis on raid Let's analyze the main components that affect computer performance, including CPU, bus I/O of the motherboard, memory I/O, hard disk I/O, and Nic I/O. Now the CPU performance is good, however, the overall I/O performance of the computer is low, seriously affecting the computer performance. The current computer's bus I/O and memory I/O speed can reach more than 5G/s, however, disk IO is usually low. Let's analyze several common methods. For SATA hard disks, the speed is less than

redundancy can be applied to the disk groups where the backup files are stored. 3. Generally, data files and backup files and archive log files are stored in two different disk groups, instead of different Luns in the same disk group, perform Raid1 + 0 for both disk groups. This will not affect the performance, and can save a hot spare disk to improve the space utilization. However, if the data volume is large, partitioning the backup disk space by Raid1 + 0 may also lead to a waste of space; B

GIS image cutting performance tuning and GIS image Performance TuningStatus Quo and objectives DellR920 Server, virtualized vmware vsphere 5.5 system, Guest System Windows Server 2012 R2. Deploy software ARCGIS 10. Image graph cutting test: the original cut takes 70 hours, And now it takes 17 hours. There is still room for further optimization. Debugging objectives: 1. Verify the optimal graph cutting parameter configuration in the virtualization environment, and issue the optimal performance c

Xiaoyin won the bid for 10 DL388G8 servers in a project), which is equivalent to winning the bid at a low price. New customers must accept one item in the contract, so we cannot make any mistakes here; who knows when the acceptance reaches 6th sets, the problem arises, how does the array card become B120i? Unable to implement the SAS array 5, how is the original factory output possible? Instead, I asked the total generation to collect photos: 650) th

Experience: Different from the X86 server hard disk replacement, the general minicomputer does not use RAID card management, it is necessary to replace the hard disk before the replacement of the steps, may be appropriate according to the standard process of modification, if you are not sure, you can find experienced colleagues to review the next step. The approximate replacement drive is as follows:First, confirm the status informationMETADB #查看状态数据状态Metastat-pcMetastat #查看SVM镜像对应关系.Iostat-en #