Affordable and Manageable Storage, A Server Guide

Today i found an interresting article at anandtech, which talk about storage on a server side. This article can be a guide and more information to figure about storage systems, i copy paste a bit here, happy reading.

 

Disk performance?

Before we start discussing the different topologies and technologies in the storage world, it is good to get back to basics. The basic component of 99.9% of the storage technology out there is still the hard disk.

To understand the basic performance of a disk, take a look at what happens when a request is sent to the disk:

  1. The Disk controller translates a logical address into a physical address (cylinder, track, and sector). The request is a matter of a few tens of nanoseconds, the command decoding and translating can take up to 1 ms.
  2. The head is moved by the actuator to the correct track. This is called seek time, the average seek time is somewhere between 3.5 and 10 ms
  3. The rotational motor makes sure that the correct sector is located under the head. This is called rotational latency and it takes from 5.6 ms (5400 rpm) to 2 ms (15000 rpm). Rotational latency is thus determined by how fast the rotational motor spins.
  4. The data is then read or written. The time it takes is dependent on how many sectors the disk has to write or read. The rate at which data is accessed is called the media transfer rate (MTR).
  5. If data is read, the data goes into disk buffer, and is transferred by the disk interface to the system.

Media transfer rate (MTR) depends on the rotation speed and on the density with which data is stored. The higher the density, the more data moves under the head in the same amount of time.

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Thornography

Thornography, the new album from cradle of filth is now in stores across the country. 

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Selamat Idul Fitri Tahun Ini

Untuk teman teman dan siapa saja yang telah melaksanakan ibadah bulan ramadhan ini dengan tulus dan ikhlas, saya mengucapkan selamat semoga anda mendapatkan idul fitri.

pas sholat jum'at kemarin di mesjid muslimin teladan, khatib nya ngomong kalo untuk menyambut idu l fitri ini yang paling utama adalah memaafkan, untuk itu aku akan berusaha memaafkan kesalahan kalian (kalau ada) dan doa kan aku sukses melaksanakannya. 

kemungkinan aku akan mendapatkan 1 syawal pada 24 Oktober ini, aku memang memilih jalur yang lebih umum.

baiklah, jika kalian menganggap paragraf ke dua di atas tidak tepat, maka aku mohon maaf.

semoga tuhan masih kasihan sama kita mengingat dosa dosa yang telah kita lakukan. 

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recover root password, slackware, reiserfs

di yellow ada pc yang biasa aku pake kalo aku pas lagi maen ke situ, pc ini aku dual boot win2k (untuk kebutuhan warnet) dan slackware 10.2 (untuk kebutuhanku), jadi aku selalu pake slackware nya kalo lagi maen di yellow.

nah, gak tau ntah napa… tiba tiba aku gak bisa login root nya, password salah, aku coba segala macam password simpanan pun gak bisa juga, aneh sekali rasanya, tapi aku gak gitu kuatir, kan bisa di gantikan password root nya dengan login linux single.

aku pun reboot dan boot dengan pilihan linux single, nah ada kejutan di sini, ternyata prompt nya tidak lansung ke bash#, tapi masih meminta login ??? sungguh sangat tidak biasa sekali…

 

Welcome to Linux
(none) login: 

 

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Welcome Back Smoke !

thanks to the people who burn the forest, perhaps some day you all will be burn by the forest as a revenge. 

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