are also a challenge to memory. If you have a low level of access at a certain point in your application scenario, doing the compact and split at this time will not only complete split and compaction, but also ensure smooth read and write performance for most of the time. Compaction is unavoidable, split can be adjusted from auto to manual. By turning this parameter value to a hard-to-reach value, such as 100G, you can indirectly disable automatic sp
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Environment: Red Hat 4.8.3-9Software dependencies: NoneUse reason: Request 100G virtual machine, but DF view found only 20GTo view existing partitions hanging in the situation:[[Emailprotected]~]$df-h File System capacity used available used% mount point/dev/mapper/ Centos-root14g994m13g7%/devtmpfs 7.8g 07.8G0%/devtmpfs 7.8g 07.8G0%/dev/shmtmpfs 7.8g 8.5M7.8G1%/runtmpfs 7.8g07.8g 0%/sys/fs/cgroup/dev/sda1 497m125m373m25%/bootDue to the
Preparation material: Ubuntu image,: Http://www.ubuntu.com/download/desktopISO image software: UltraISO, Baidu search download20-30g about the free hard disk space, there is no matter how to make these space, the simple is to delete the tail partition of the hard disk, note the data storage, and then re-partition, and then left 20 to 30G of space does not partition on the line, for example, my last partition has 100G, we put this
-m "comment description" filename# unlockSVN unlock filename5.7 Code Update conflictsIf an expiration is provided at the time of submission, the code conflict is explained by SVN update filename, then SVN resolved filename, and then the SVN commit-m "comment description" filename.5.8 Viewing logsSVN log filename5.9 Viewing file informationSVN info filename5.10 Repository MergingMerge library 1 into Library 2: first checkout the Library 2 code to the local directory (svn co url2), then go to this
tree for information about free space.Dynamic Inode AssignmentIn order to understand dynamic inode allocation, it is still necessary to use EXT2/3. The following table lists the limitations of the Ext2 file system:Table 1. Ext2 restrictions
Limit
Maximum number of files
File system space Size v/8192For example, 100G size file system, can create a maximum number of files 131072
Figure 4 show
Requirements: The virtual machine needs to expand the hard disk capacity, through the Vcenter Edit resource settings, the original 50G expansion to 100G. But not immediately. The following actions are available:650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M00/83/B1/wKioL1d6mWuCIUL8AAA4Dt_3u9w879.png "title=" Qq20160705011341.png "alt=" Wkiol1d6mwuciul8aaa4dt_3u9w879.png "/>After the modified 100G,
First, install Ubuntu dual system in Windows7Tools/MaterialsWindows7 64-bitUbuntu 16.04 32-bitUltraISO the latest version (used to bake the image file onto a USB flash drive)Empty u disk (if you have files, please backup first) 1. Allocate a piece of disk space (100G) for the installation of ubuntu16.04Win7 comes with the tools for allocating disks ([Computer]->[management]->[Disk Management]-> Select compressed disks->[Right-click]->[Compressed volu
, logical partition starting from 5How to view partitionsFdisk-lParted-lLinux Partitioning recommendationsMust have at least/partitionThe role of swap: virtual memory, the capacity of swap,1.5* memory after the physical memory is exhausted. When the memory is greater than 16G, the virtual memory will be 6-16.General partitions
/boot, storage of the Linux kernel and boot program, 100m-200m, fixed size, primary partition (not required)
Swap, 1-2 times the memory, can also be divided.
Ubuntu System Installation1. Do RAID5, and install ubuntu16.04 system, partition/100g,/boot 512mb,data remaining, all use XFS files.2. Set root can be directly remote system.The first step is to do RAID5, with Dell server as an example:The following screen appears when booting, press Ctrl+r as prompted,The following is a disk array configuration interface, operated by F2, and the first to create a new virtual disk.Doing RAID5 requires at least three h
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After the application system will be opened, after the opening of 1 days to transfer data to the application space, free space to
, such as the front of Baidu launched cloud storage platform, you can only forward to get 100G of the network disk, which for users is a pretty good thing, And only need to share at random, very easy not to be forced feeling, users are willing to share, so the day of the reprint and registration amount is quite to the force. There is a similar example of the previous Love station network is to adopt a similar way of promotion, but it requires each use
functions, At the same time achieve the same effect, of course, with Redis and slowly discard MC.Memory and hard disk relationship, hard disk placement of the principal data for persistent storage, and memory is currently running part of the data, CPU access to memory rather than disk, which greatly increased the speed of operation, of course, this is based on the program's local access principle.Reasoning to Redis+mysql, it is a mapping of memory + disk relationships, MySQL placed on disk, Red
, doing the compact and split at this time will not only complete split and compaction, but also ensure smooth read and write performance for most of the time.
Since split and compaction so affect performance, there is no way to remove.Compaction is unavoidable, split can be automatically adjusted to manual.By turning this parameter value to a hard-to-reach value, such as 100G, you can indirectly disable automatic split (Regionserver does not split th
-intensive. But row mode is more reliableWhen the CPU soared to 500%, first use the top command to see if the mysqld occupancy caused, if not, find the high-occupancy processIf it is the mysqld caused by the session, locate whether there is a resource consuming SQL running to find the high-consumption SQL and kill and then limit the number of connections or make other adjustmentsThe difference between mysqldump and xtranbackup:In general, the 100G lib
is not too big? The physical disk is much cheaper than memory, take a memory 16G HDD 1T Server For example, if you want to fill 1T hard disk, at least 100G of memory , far greater than 16G.Consider that there may be multiple indexes on a table, federated indexes, smaller data rows, and so on, the actual occupancy ratio is usually greater than 1/10, sometimes up to 1/3. In an index-based storage schema, the 索引:数据的占用比 index cannot be loaded into memory
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