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廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...artbeat+NFS文件共享存储架构（主从模式）
http://blog.chinaunix.net/uid-25266990-id-3803277.html
DRBD使用gfs2,cman实现双主分布式文件存储方案
http://blog.sae.sina.com.cn/archives/3609
2.1搭建实验环境了
所需要的软件
REHL 6.4
drbd-8.4.6.tar....
How to write trycatch in R
...vel/library/base/html/connections.html",
"http://en.wikipedia.org/wiki/Xz",
"xxxxx"
)
readUrl <- function(url) {
out <- tryCatch(
{
# Just to highlight: if you want to use more than one
# R expression in the "try" part then you'll have to
...
Groovy: what's the purpose of “def” in “def x = 0”?
...ng piece of code (taken from the Groovy Semantics Manual page ), why prefix the assignment with the keyword def ?
6 Answe...
Command line progress bar in Java
... job done.
The same kind of progress bar you would see using wget under unix.
Is this possible?
15 Answers
...
Favicon not showing up in Google Chrome [duplicate]
...vicon without cache (thanks @Stanislav).
<link rel="icon" type="image/x-icon" href="favicon.ico?v=2" />
Favicon Usage
How did you import the favicon? How you should add it.
Normal favicon:
<link rel="icon" href="favicon.ico" type="image/x-icon" />
<link rel="shortcut icon" hre...
What are the “standard unambiguous date” formats for string-to-date conversion in R?
...d/or abbreviations, as the conversion will depend on your locale (see the examples in ?strptime and read ?LC_TIME).
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How do I determine k when using k-means clustering?
...
You can maximize the Bayesian Information Criterion (BIC):
BIC(C | X) = L(X | C) - (p / 2) * log n
where L(X | C) is the log-likelihood of the dataset X according to model C, p is the number of parameters in the model C, and n is th...
Test if a property is available on a dynamic variable
...cification.
So you should actually try to access the member and catch an exception, if it fails:
dynamic myVariable = GetDataThatLooksVerySimilarButNotTheSame();
try
{
var x = myVariable.MyProperty;
// do stuff with x
}
catch (RuntimeBinderException)
{
// MyProperty doesn't exist
}
...
How to Query an NTP Server using C#?
...got deleted (It was a link to a Google code search results that no longer exist), I figured I could answer this question for future reference :
public static DateTime GetNetworkTime()
{
//default Windows time server
const string ntpServer = "time.windows.com";
// NTP message size - 16 ...
Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
...
I came up with a way using a list comprehension: df[[(len(x) < 2) for x in df['column name']]] but yours is much nicer. Thanks for your help!
– sjs
Dec 13 '12 at 4:17
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