Membuat miror hard disk adalah pekerjaan yang susah-susah gampang, yang harus kita perhatikan adalah kita harus melakukannya secara terurut dan terinci karena apabila salah langkah maka harddisk malah akan tidak bisa diaccess dan di boot.
Adapun langkah-langkahnya sebagai berikut:
1. format ==> lihat disk yg akan digunakan dan yg akan dimirror
misal : c0t0d0 (disk yang akan dimirror) dan c0t1d0 (disk ke dua sebagai disk mirror)
2. untuk root biasanya slice 0 maka disknya c0t0d0s0 dan c0t1d0s0
3. untuk swap biasanya pada slice 1 maka disknya c0t0d0s1 dan c0t1d0s1
4. Misalkan /var dipisahkan dari / dan diletakin pada slice 3 dan penulisan disknya c0t0d0s3 dan c0t1d0s3.
5. untuk replica/database svm biasanya diletakin pada slice 7 besarnya minimal 50MB dan disknya c0t0d0s7 dan c0t1d0s7
6. check apakah database replica sudah dibuat dengan menjalankan metadb
7. kalo belum ada lakukan metadb -a -f -c 5 c0t0d0s7 c0t1d0s7
setelah itu menyamakan partisi disk1 ke disk2.
8. prtvtoc /dev/rdsk/c0t0d0s2 |fmthard -s - /dev/rdsk/c0t1d0s2
9. memulai mirroring
10. metainit -f d11 1 1 c0t0d0s0
11. metainit -f d12 1 1 c0t1d0s0
12. metainit d10 -m d11
13. cp /etc/vfstab /etc/vfstab.date.xxyyzzhmetadb
14. metaroot d10 ==> d10 akan tercreate secara automatis pada /etc/vfstab
15. metainit -f d21 1 1 c0t0d0s1
16. metainit -f d22 1 1 c0t1d0s1
17. metainit d20 -m d21
18. metainit -f d31 1 1 c0t0d0s3
19. metainit -f d32 1 1 c0t1d0s3
20. metainit d30 -m d31
21. lockfs -fa
22. edit /etc/vfstab untuk mengganti c0t0d0s1 menjadi /dev/md/rdsk/d20 dan d30.
23. reboot system
24. syncronize mirror disk
25. metattach d10 d12
26. metattach d20 d22
27. metattach d30 d32
28. ls -l /dev/dsk/c0t0d0s0 /dev/dsk/c0t1d0s0
29. eeprom "nvramrc-use?=true"
30. eeprom "nvramrc=devalias sds-root /pci......./disk@0,0:a devalias sds-mirror /pci..../disk@1,0:a"
untuk step ini lihat hasil ls -l pd step ke 28 dan dimulai pada line /pci.... dan sd@0,0 atau sd@1,0 diganti jadi disk@0,0:a dan disk@1,0:a.
31. eeprom "boot-device=sds-root sds-mirror"
32. Selesai deh.....ntar kalo disk yg satu rusak maka automatis os akan pindah ke disk yg satu lagi karena sudah dilakukan step 29, 30, dan 31.
Friday, May 2, 2008
Mirroring Harddisk on Solaris
Saturday, March 22, 2008
Backup on Lto Tape
The value of your data more then the hardware and we know that when we loss over data and that’s why the Backing up data has become golden rule in the computer world. We need to backup data once in a day to avoid panics at the time of data loss. Data backups, hard drive backups, email backups prove beneficial when you lose some important data.
In such case you can trust the backed up data! But how can we create backup of over data and what hardware can we use to have backup on that is reliable and easy to use. Capabilities such as dynamic rate matching and dual mode compression enhance tape drive performance and product life.
Released in 2007, LTO-4 tapes have a native capacity of 800 GB which can go up to 1.6 TB worth if compressed (2:1). The data transfer rate has gone up to 120 MB/s and a 256 bit AES-GCM drive level encryption has been added. LTO 4 Ultrium also features backward compatibility with LTO-2 and LTO-3 drives. Another advantage of using LTO tapes is that future versions are in development so there will be a chance to update your system instead of it being phased out of use. Multiple sources for LTO media and drives reduce production bottlenecks and also ensure investment protection for OEMs and end users alike. Related products available at Tape4Backup are: LTO 1, LTO 2, LTO 3, LTO Cleaning Cartridge, LTO Barcode Labels, LTO Empty Cases and LTO Cartridge Memory Reader.
Backup tape users are increasingly sensitive to data security in the wake of high profile data loss incidents, and encryption techniques have appeared to help ensure security. For example, if an unencrypted tape is lost or stolen, its data is at risk. But, if an encrypted tape is lost or stolen, its data is still considered to be secure. Thus, the use of encryption has a profound effect on corporate liability and reporting obligations.
We can find LTO 1, LTO 2, LTO 3, LTO Cleaning Cartridge, LTO Barcode Labels, LTO Empty Cases and LTO Cartridge Memory Reader on the following link
http://www.tape4backup.com/ait-2-tapes.php
Ask me for detail and info: links@tape4backup.com
Wednesday, February 6, 2008
Keyword Articles
To begin with, a short explanation of what a keyword article is. When a search engine user begins to look for information on a particular subject, there are certain phrases that are used by the vast majority of people. For example, if you’re building a web site and want to know how to get on the first page of Google, you may type in “Top Rankings”, or maybe “First page of Google.” Because these search phrases are tracked by various methods there are tools available that will tell you which phrases are the most popular for a particular subject.
Keyword articles attempt to capitalize on this by using the search phrase within their text. As the search engines index web pages, they’ll use these phrases to determine the subject matter of the page and rank it accordingly. Sounds pretty simple right? And it is. In the early days of the web it was possible to increase your ranking by simply repeating the search phrase as many times as possible. But as internet use began to become widespread, the search engines were forced to become more sophisticated in order to weed out the sites that abused this fact. After all, a web page that was a constant litany of one single keyword was of very little use to a researcher, and the whole idea of the internet was to deliver information and not keywords.
In order to deal with the problem, Google, Yahoo, and MSN developed highly complex algorithms to separate good, highly informative sites from the so called “spam” sites. Today, in order for a site to achieve high rankings, the site has to deliver good information in a unique way. These search algorithms have now evolved to a point whre the overuse of a keyword, or just stuffing keywords into an article, will get a site penalized in the rankings, or in some cases, even eliminated from the search results altogether.
So what makes a good keyword article? First of all, a keyword article has to give the user good solid information. Secondly, the use of the keyword phrase has to occur in a natural manner. Forcing the issue only results in an awkward reading article and defeats the intended purpose of the keyword article.
If you intend to use keyword articles on your site, make sure that you’re a good solid writer. Unfortunately many site owners are not natural writers and their articles reflect that fact. Other site owners will go overboard in their use of the keyword phrase and end up getting penalized. If you aren’t a natural writer, or you don’t have the time to do research and write good articles, then hire a writer to do them for you. There are a number of sites where you can find freelance writers who are familiar with keyword articles so that’s not a problem. But remember that you’ll generally get what you pay for. While it may be tempting to go for the lowest bid, (and the bids can get awfully low), you simply won’t get a quality keyword article for a few dollars. Worse yet, you may end up with computer generated articles that are almost incomprehensible or even plagiarized material. If you truly want to achieve high rankings, keyword articles are an essential part of the formula, but they have to be quality articles that deliver good unique information in a useful way. If you can write that type of article you can write your own keyword articles. If you can’t, then enlist the aid of a qualified writer to produce the keyword articles for your site.
source: www.freearticles.com
