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LINUX Logical Volume Management: LVM

abstraction level at the highest level of LVM, which puts logical volumes and phsical volumes in a storage unitPV Physical Volume:A physical volume, usually a hard disk, or a raid group that looks like a hard diskLV Logical Volume (LV):Similar to disk partitioning, for system-visible standard block devices, which can include file systems such as/homePE physical ExtentEach physical volume PV is divided into a basic unit called the PE (physical extents), with a uniquely numbered PE being the smal

Application of Operational Research basics: Combinatorial Optimization (4)-Approximate algorithm selection (2)

This lesson proves that the ratio of the first fit algorithm to bin packing problem is 1.7.Averaging volumeIf there are $n $ items, the volume of each item is 0.51, we can analyze the lower bound of the optimal objective function value at least about $n/2$. But the Nether is too loose (in fact the optimal target function value is $n $) and can only be used to prove that the approximate ratio is 2. How can we prove that the ratio is 1.7?The clever mathematicians somehow thought of the method of "

PHP rpm Package Tutorial in Linux

,.registry} %{__install}-p-d-M 0755 sapi/fpm/ INIT.D.PHP-FPM%{buildroot}/etc/init.d/php-fpm %{__install}-p-d-M 0644 php.ini-production%{buildroot}/%{_ Prefix}/etc/php.ini #rpm安装前执行的脚本 %pre Echo '/usr/local/lib ' >/etc/ld.so.conf.d/local.conf /sbin/ldconfig If [$ = 1- A-Z "' grep ^%{_user}/etc/passwd '"]; then # has 3 values representing actions, installation type, processing type groupadd%{_group}-G 10000 # 1: Indicates installation useradd-u 10000-g 10000-m%{_user} nbsp; # 2: Upgrad

Codeforces 86D D. Powerful Array (Mo team algorithm)

of the output should contain single positive integer-the p Ower of the i-th query subarray. %lld specificator to read or write 64-bit integers in C + +. It is a preferred to use cout stream (also). Examplesinput3 21 2 11 21 3Output36Input8 31 1 2 2 1 3 1 12 71 62 7Output202020NoteConsider the following array (see the second sample) and its [2, 7] Subarray (elements of the Subarray is colored): Then k1 = 3, k2 = 2, k3 = 1, so the power was equal to 32 1 + 2 2 2 + 12·3 =. AC Co

Differential constraint system

The differential constraint system refers to a series of inequalities:$$ x_j-x_i \le C_{ij} (1\le I, J \le N) $$Of course i,j do not have to take 1-n, and in the case of expansion, for each (I,J), can be a number of $C _{ij}$, but we easily turn them into an inequality.Before solving the inequality group, we can analyze the nature of this inequality group.1. This

Linux logical volume management instance

logvol00 successfully resized # View the modified logical volume size [Root @ localhost ~] # Lvdisplay--- Logical volume ---LV name/dev/volgroup01/logvol00VG name volgroup01Lvuuid udSSl6-MVve-m0Zs-2lsH-63KM-m60d-Jf93ZOLV write access read/writeLV status available# Open 0 LV size 1.97 GB Current le 63Segments 1Allocation inheritRead ahead sectors auto-Currently sets to 256Block device 253: 0--- Logical volume ---LV name/dev/volgroup01/logvol01VG n

Popular Science: Learn about Telnet [so easy]

manner. All these designs aim to enhance the adaptability to heterogeneity. It can be seen that the adaptability of telnet is heterogeneous to the application of the four Win2000 Telnet service. Commentaire :Il n'y a rien ?faire sauf si vous avez un pied de page ?ins閞er sur toutes vos pages.Donc en r鑗le g閚閞ale : ne touchez pas ?ce fichier.--> Commentaire :Ce fichier contient les diff閞ents chapitres de votre projet.Ils seront affich閟 sur chaque page

BZOJ 2561: minimum spanning tree [minimum cut/maximum stream]

Tags: des http io ar OS sp for data onDescriptionGiven a connected undirected graph G = (V, E) with the positive weight of a side, where N = | V |, M = | E |, N points are numbered from 1 to N, given three positive integers u, v, and L (u ne; v), we suppose that we add an edge (u, v) with the edge weight of L ), so how many edges need to be deleted to make this edge appear on the minimum generation tree or the maximum generation tree?InputThe first line contains two integers separated by spaces

Bzoj 1834: [Zjoi2010]network Network Expansion "maximum flow + minimum cost maximum flow"

The first question directly runs the maximum flow can. The plan is built according to the cost flow, the cost is 0.For the second question, in the first question Dinic the remainder of the network to build, the original image of each side (I,J), built (I,J,INF,CIJ), that the cost of C can be augmented by the road. Then from the new source point, the s,1,k,0 represents the traffic to increase the K. Run the minimum cost maximum flow.#include #include #include #include using namespaceStdConst intn

Nagios a script to monitor the number of TCP state connections

;;fin_wait1| FIN_WAIT1)Status=fin_wait1;;fin_wait1| FIN_WAIT2)Status=fin_wait2;;last_ack| Last_ack)Status=last_ack;;Close_wait| close_wait)Status=close_wait;;*)Return 1;;EsacShift 2Let scount++;;-t|–timeout)[$#-lt 2] return 1if! echo $ |grep-e-Q "^[1-9][0-9]*$"; thenReturn 1FiTimeout=$2;;*)Return 1;;EsacDonereturn 0}Alarm () {connect= ' Netstat-ant | awk '/^tcp/!/listen/{s[$NF]++}end{for (i in S) print I,s[i]} 'Established= ' echo $connect |awk '/established/{print $} '[Z $established] establi

Shell Scripting Exercises

Tags: rectangle exp Specify nohup How many exit sed take out rowThis article mainly introduces examples of shell programming First, the logical judgment if statement 1. Judging the age?[[emailprotected] 9_1 ]#cat iftest.sh #!/bin/bash read -p "Please input your age:" age ## 判断用户输入的必须是数字 if [[ "$age" =~ ^[0-9]+$ ]];then true else echo "Please input digit" exit 10 fi ## 判断用户的年龄,并输出相应的信息 if [ "$age" -ge 0 -a $age -le 18 ];then

Children's Day depends on it ~__ education

Children's Day depends on it ~ Heartily will come, you treasure Mom treasure Dad is to take a baby to where to play. What gifts do you buy for Eva? This year Children's Day how to arrange and vexed. Very Le Jun to recommend 8 small program, solve your problem.1, parents State SelectParents state Happy Parent-child life, exclusive pre-sale boutique children's play, the value of the holiday hotel parent-child package. Extremely

6.087 practical programming in C, lec9

External libraries. B-trees, priority queues. Symbols and libraries • External libraries provide a wealth of functionality-example: C standard library • Programs access libraries 'functions and variables via identi referers known as symbols • Header fi le declarations/prototypes mapped to symbols at compile time • Symbols linked to de provided nitions in external libraries during linking • Our own program produces symbols, too The so-called Symbol shou

Mrpt data formats and serialization

Document directory Option A: streaming from the role le Option B: Read at once Mrpt data file formats: . Gridmap (or compressed version .gridmap.gz). A 2D occupancygrid map. These? Les consist on one coccupancygridmap2d objectserialized into a binary. See chapter 10 for more details on howto serialize and de-serialize objects. . Ini. configuration? Les. the format is plain text, with the structured in sections (denoted as [name]) and variables

Magic Ball Problem 2011-12-29

ExampleInput.txt4Output File ExampleOutput.txt111 82 7 93 6 104 5 11————————————————————Split each point I into Xi and Yi two pointsFor I,j, the i+j is the full square number, and J>i is built with the edge {Xi,yj}{s,xi},{yi,t} weights are 1.Enumerate the answers in turn to determine whether the network maximum flow is feasible.————————————————————1 Program Stone;2 varN,le,flow,m,s,t:longint;3Head,vh,dis,cur,pre,last:Array[-1.. the] ofLongint;4Next,d

Vijos 1255 mooncake Box maximum sub-matrix

Test Instructions:LinkMethod:Maximum sub-matrixparsing:have done so many of the largest sub-matrix, this problem casually yy came out, but I have an idea ah, if a n*m matrix, there are some bad points, non-bad points of the right value, can be negative, then the selection of the maximum and how much of the non-bad idea matrix? It seems that DP? First of all, because the bad point weight is 0, you can preprocess the sum[i,j] for the lower right corner, (I,J) for the upper left corner of the matri

HDU 1506 largest Rectangle in a histogram (monotonic stack)

Test case.OutputThe For all test case is output on a single line, the area of the largest rectangle in the specified histogram. Remember that this rectangle must is aligned at the common base line.Sample Input7 2 1 4 5 1 3 34 1000 1000 1000 10000Sample Output84000Test instructions: From left to right there are n rectangles with a different height but 1 of the bottom edge, asking what the area of the rectangle from which the largest area can be cropped is. And the edge of the moment line must be

Program design competition for the sixth college student in Henan province-the supply station of aliens

. Kong wants to know how many Aurora points need to cover all lakes and oceans.2 ≤ K ≤ 5 1 ≤ R ≤ 50 1 ≤ N ≤ 100-100 ≤ Roxy PYi &

The content of which strong millet music to the war against the air

"Our content is twice times that of friends. "When Xiaomi founder Lei June made this gesture, I wonder if he could have thought it would lead to a lively war." These two days, around the video content which strong problem, millet and Le vision of the controversy, became the internet industry the most lively event. Millet CannonTwo times the video content of the music visionOn June 10, at the launch of Xiaomi's announcement of its video content investm

Bzoj 2127 Happiness "Network Flow Dinic"

the x selection, y selection, All options, (x, y) are selected: y selection x, that is, cut off the x selection, y selection, (x, y) are selected/+ (x, y) are selected/2+ (x, y) are selected/2+ (x, y) is the choice of the text/2, that is, cut the x selection, y selection, (x, y) are selected, (x, Y Tu Xuanwen: For the operation divided by 2, in order to avoid the error of the next rounding, we choose to take all the traffic, and finally/2.$ ans=sum (full benefit)-min cut $P.S. When using th

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