Monthly Archives: May 2012

"Education is all about showing someone the possibilities" : http://goo.gl/vQgfU …

"Education is all about showing someone the possibilities" : http://goo.gl/vQgfU

Quoted : _"Jacques was 76 years old and his kids had bought him a laptop.

I finally just told him that you can do just about anything in the virtual world that you can do in the real world. And so help me, God, I quoted a Microsoft commercial. “Where do you want to go?” (“Today” is implied.)

He thought he was being cute, I guess, when he said, “Paris!” I Googled Paris, and he was impressed by the photo of the Eiffel Tower and all, and the Google map, but then I told him I could do so much better than that.

I asked him for the address of the house he grew up in, and then I took him on a virtual walk down the street where he’d lived as a child, a town he hadn’t seen since he left as a 20-something. He pointed out where his father had owned a bakery (it’s a camera shop now), the church where he had his First Communion (it’s still there), and the corner where his school used to be (vacant lot).

Then, I set up a Gmail account for him, and a Skype account, and about 15 minutes and a flurry of text messages later, he was video-chatting with his favorite granddaughter. He said it was like Buck Rogers.

Ah, but the coup de grâce was when I found him a new fishing boat on eBay."_

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W0rdN3rd comments on I e-mailed a teacher to say thank you, and he posted it on Facebook saying “I really needed this.” What’s something you’ve said/done that you didn’t expect to have such a big impa…
I used to teach computer classes to senior citizens at a community center–oh, the stories I could tell. But, one student named Jacques was 76 years o…

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Ini adalah tulisan paling bagus tentang hijab / jilbab yang pernah saya temui – dan,…

Ini adalah tulisan paling bagus tentang hijab / jilbab yang pernah saya temui – dan, ditulis oleh non-muslim. Feminis pula. Sangat mencerahkan : http://www.smh.com.au/news/opinion/behind-the-veil-lives-a-thriving-muslim-sexuality/2008/08/29/1219516734637.html?page=fullpage#contentSwap1

Dikutip : "When I wear my headscarf or chador, people relate to me as an individual, not an object; I feel respected."

Selamat menikmati.

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Behind the veil lives a thriving Muslim sexuality – Opinion –
A woman swathed in black to her ankles, wearing a headscarf or a full chador, walks down a European or North American street, surrounded by other women in halter tops, miniskirts and short shorts. She…

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Awas, bit rot mengancam file & data kita : http://ask.slashdot.org/story/12/…

Awas, bit rot mengancam file & data kita : http://ask.slashdot.org/story/12/05/07/1859235/ask-slashdot-whats-a-good-tool-to-detect-corrupted-files

Sekilas mengenai Bit Rot : http://en.wikipedia.org/wiki/Bit_rot

Soal bit rot ini sudah sejak dulu saya ketahui – namun, tanpa saya sadari, tiba-tiba saja mendadak sudah menjadi sangat relevan.

Contoh: Spec SATA menyatakan bahwa untuk setiap 1 TB, akan ada 1 bit yang error. Padahal, komputer di rumah saja sudah 3 TB ukuran hard disk nya :-/ http://goo.gl/UqaXj

Itu baru dari SATA. Masih ada lagi potensi ancaman bit rot / error dari :

# Flashdisk : http://lwn.net/Articles/349970/
# DVD & CD
# Cosmic Rays : 1 error per 256 MB per Bulan : http://en.wikipedia.org/wiki/Cosmic_ray#Effect_on_electronics
# Soft error : http://en.wikipedia.org/wiki/Soft_error#Causes_of_soft_errors
# Dst

Apa yang bisa kita lakukan untuk melindungi data-data kita dari ini semua ?

Pencegahan

# Backup data : dari Linux, bisa menggunakan rsync.
Atau, bisa seperti Time Machine dengan rdiff-backup : http://www.howtoforge.com/linux_rdiff_backup

# Gunakan filesystem yang membuatkan checksum untuk seluruh file & data. Contoh: ZFS, brtfs.
(note: ext4 hanya membuat checksum untuk metadata)

# Gunakan memory / RAM dengan fitur ECC (Error Correcting Code)

# Duplikasi data : Filesystem, seperti Ceph, secara otomatis akan membuat copy dari data yang ada dan menyebarkannya ke komputer yang berbeda = data lebih aman + performa tetap tinggi.
http://en.wikipedia.org/wiki/Ceph

note: RAID ada banyak problemnya, lebih baik gunakan Ceph / dll untuk dalam skala besar : http://lwn.net/Articles/349970/

# Gunakan script md5verify : http://micropipes.com/blog/2011/01/30/md5verify-a-script-to-automatically-verify-file-integrity/

# Gunakan par2 untuk membuat verification + recovery files : http://en.wikipedia.org/wiki/Parchive

note : Par2 ini sangat CPU-intensive. Saya pribadi menggunakan par2+tbb, yang bisa memanfaatkan semua core CPU yang ada : http://chuchusoft.com/par2_tbb/

contoh : par2 create -n1 filesaya.doc

Maka akan dibuat sebuah file recovery bernama filesaya.doc.par2 & filesaya.doc.vol000+100.par2
File ini kemudian bisa digunakan untuk memeriksa integritas filesaya.doc – dan menyelamatkannya jika ternyata corrupt : par2 verify filesaya.doc

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Ask Slashdot: What’s a Good Tool To Detect Corrupted Files? – Slashdot
Volanin writes “Currently I use a triple boot system on my Macbook, including MacOS Lion, Windows 7, and Ubuntu Precise (on which I spend the great majority of my time). To share files between these s…

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Tercengang melihat istri seorang kenalan yang, setelah bertahun-tahun tidak punya…

Tercengang melihat istri seorang kenalan yang, setelah bertahun-tahun tidak punya anak, baru beberapa bulan ini dikaruniai seorang bayi.

Dulu istrinya kerjanya mengeluh terus di Facebook, kesepian di rumah, suami pergi ke kantor setiap hari, sendirian di rumah tidak ada anak.

Sekarang ? Istrinya mengeluh terus di Facebook, anaknya menangis di malam hari, rewel ketika dia mau tidur siang, sebentar menangis, sebentar minta susu, dst.

Haduh…. jadi maunya apa ?? Ini salah, itu salah. Gak ada puasnya 😀

Mengeluhnya di publik / via Facebook pula…..saya yang cuma membacanya saja malu sekali. Entah bagaimana perasaan suaminya…

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