So many things in last month, there is no time for me to update laotudou.com.
EMC got DDUP, it’s funny, now.
China stock market went down in last 4 days, but USA one wake up.
Baidu.com became the biggest search engine in China, overcoming Google. I didn’t agree with this news until I knew there was still someone only know QQ and Baidu. To those people, Internet is QQ for chatting, and Baidu for game and music.
Now, we can use disk as data backup media, so it appeared, the dedupe.
We think disk can be more available than tape, and it’s more suitable for random read and write I/O, and there is no need to mount tape and find record position. All of physical operations can be replace by disk header’s moving.
It’s funny.
Dedupe depends on the safety of the first backup data, if it lost for any reason, the hazard can not be evaluated.
To make sure the first data is available at any time, let’s look at what we can do.
First, we using RAID, most is RAID5, even RAID6. With hot spare disk, we can prevent data lost under two disks broken.
Second, Volume Mirror.
Third, data file can be splitted to blocks and stored in distribution storage, maybe it like the concept of cloud storage, which is prompted by EMC now.
Forth, multicopy over network.
Fifth, tape backup. Haaaaaaaaaaaaaaaaaaaaa, we return to the start point. Under most circumstance tape-backup is not the best choice comparing with disk-backup, but no one can discard it. If using this method, we assume disk dedupe will not lose data in most situation, if lose, whether it can be recovered, depends on our fortune or planning. If you have a careful design of tape-backup planning, such as shedule testing and recovery, dual copies in different sites, tape-backup is reliable. So why we still use dedupe?
Dedupe, using time to change space. We have powerful calculation, but limit disk space(more expensive than tape). To save space must consume CPU, alse using more CPU in recovery.
Another question, how long the method of dedupe can exist. Tape can be preserved in tens of year, but dedupe device? The deduped data must be re-stored or re-backuped in tapes at last, untill we found other mothed to replace tape.
by IT1999
at 1:00am, Feb. 19, 2009
It’s a good film, Slumdog Millionaire.
From the movie, we can understand more about India, and feel Indian’s culture and life attitude.
I always disapproved that India is the biggest competitor of China, but after watch the film, I began to believe this opinion.
I also was impressed by the dancing of the end, a very good idea.
India has great history, but no history burden.
Great culture plus modern technolegy will make India a great country, if there is no war or threat.
It’s a long time no care about Alexa.
Yesterday installed Alexa Sparky 1.1 for Firefox under Windows XP, also Linux version in my Ubuntu V8.04.
Last day, the rank is about 8m.
Today, it is about 5m.
Refer: http://www.alexa.com/data/details/traffic_details/laotudou.com
The first university of Chinese, Peiyang University is hidden by his “modern” name “Tianjin University”, also with his glorious history.
There’re some introductions of Peiyang University on Internet:
http://en.wikipedia.org/wiki/Peiyang_university
http://baike.baidu.com/view/63906.htm
http://zh.wikipedia.org/w/index.php?title=%E5%8C%97%E6%B4%8B%E5%A4%A7%E5%AD%A6&variant=zh-hans
* 1895 Peiyang University founded
* 1899 The first Diploma in China granted
* 1907 Developed into a comprehensive university integrating Engineering with Liberal Arts, Law and Education.
* 1935 The first group of graduate students enrolled
* 1937 The first Master’s Degree conferred
* 1951 Merged with Hebei Technical College, renamed as Tianjin University
* 1958 The first Library (floor area of 14423m²) established
* 1959 Became one of the first 16 National Key Universities
* 1981 The first group of PhD students enrolled
* 1984 The Graduate School founded
* 1985 The first Doctor’s Degree conferred
* 1995 100th Anniversary
* 1999 National University Science Park built to facilitate knowledge transfer
* 2000 Priority support Obtained from the Ministry of Education of China and Municipal Government of Tianjin for further development
Just record something changed of PEKING University in 2008,
1. Only students of PEKING University can walk in the University. If you want to visit it, sorry, you don’t have student ID, please get out. “Who give it the right to do this?”, “Is it our proud university any more?”
2. Only this year’s graduates of high school can study in it, if passed college test. If failed in this year’s test, bye-bye, you have no right to study in PEKING University any more.
PEKING University isn’t a private University, even it is, those things may be ridiculous.
Today, someone said his boy is learning writing in a teacher’s home, and the boy is about 9 years old, junior school. The writing class tuition is RMB100/Hour, and every week his child spends 2 hours to learn writing. It’s surprised me that the teacher cann’t teach more students, because every Saturday and Sunday, his schedule is full.
Then another surprise thing was told that the tuition of high school out of class was RMB200/Hour, if you want review all the class today, you would spend over RMB1000/day. Of course, the class is not our normal class, the object of the class is for college test. it’s so special that lot of people queue for it.
It’s amazing, isn’t it?
In all articles, we call our country mother, why using mother, no son?
Mother breed us, is it the reason?
We can always get courage and love from mother in our lives, but what have we done for mother?
I have give my son lots of loves with no reason, breed and teach him with patience, just because he is my son.
I think I cann’t love my country as loving my son with selflessness. Can you?
