Mike Dhani

6 November, 2008

Microsoft Volume License Keys and Open License Purchase Process

Filed under: Computer

Source : http://docs.alkaloid.net/index.php/Microsoft_Volume_License_Keys_and_Open_License_Purchase_Process

I do a lot of consulting for non-profit organisations. These organisations qualify for access to Microsoft Open License Purchases. This allows them to buy bulk copies of software from companies like techsoup.com. If you own a non-profit that hasn’t yet switched to an open source solution I suggest you check them out. This document was written as I went through the process of updating a clients VLK agreements with Microsoft. I wanted to detail this process just so people realize another reason why taking the chance to install an open source word processing system like open offices saves you from having to bring in an outside consultant just to handle the validity of the software on your network.

First thing you must do is visit https://eopen.microsft.com and sign up for an account. Make sure you notice the s on the link indicating its secure. Its seems like the IIS server microsft has its website running on hasn’t been configured to handle a redirect from a non-secure request for the eopen site. You might be lucky enough to have a client that already has an account, but I doubt you will be lucky enough that they remember the password. So you’ll probably just have to make one anyways. Click the Sign-in button on the eopen main page and follow the process.

Upon attaining a valid email and password combination for the site you can now login and update your profile information. As of February, 2007 this was done by click the MyProfile link in the top nav bar.
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Picking the right stripe size

Filed under: Computer

Posted in Storage Interconnects & RAID, Advisor - Tom by Tom Treadway

Question to the Storage Advisors, from Anonymous: Been reading your blogs most of the day (just stumbled on this site today)…WOW! Tons of excellent information/suggestions for best practice! I’ll be adding this site to my daily tech read file… One quick question: Is there a rule of thumb concerning RAID-5 Block Stripe Size to file size? Is the any direct performance correlation between Block Strip Size and NTFS cluster size? Thanks!

Thanks, man. I feel the love.

Regarding RAID-5 stripe size, in general the larger the better. In rare cases a smaller stripe size might help, but if you make it too small then performance can plummet. And of course the answer depends on the pattern of access – large or small, sequential or random, read or write, OS queue depth, …

Let’s look at an example of 4KB random reads to an 8-drive RAID-5 with an OS queue depth of 64 concurrent commands. And let’s say that each drive was capable of 100 IOs Per Second (IOPS).

Now let’s say that the stripe size on each drive was “very large” – large enough that each host command fell entirely within a stripe. That would mean that each drive would be servicing host requests at 100 IOPS, for a total of 800 host IOPS for the array. That’s as good as it gets.

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Pengertian RAID dan Levels nya

Filed under: Computer

Sumber : http://tarutung.wordpress.com/2007/01/18/pengertian-raid-dan-levels-nya/

Pengertian RAID dan Levels nya

In computing, the acronym RAID (originally redundant array of inexpensive disks, now also known as redundant array of independent disks) refers to a data storage scheme using multiple hard drives to share or replicate data among the drives. Depending on the configuration of the RAID (typically referred to as the RAID level), the benefit of RAID is to increase data integrity, fault-tolerance, throughput or capacity, compared to single drives. In its original implementations, its key advantage was the ability to combine multiple low-cost devices using older technology into an array that offered greater capacity, reliability, speed, or a combination of these things, than was affordably available in a single device using the newest technology. (diartikan sendiri aja yah.. soale pengertian ini aku comot dari wikipedia.org)

Dengan kata lain fungsi RAID adalah penggabungan beberapa harddisk menjadi satu logical unit atau satu volume

Raid Levels
1. RAID O.
Arti : Keseluruhan harddisk yang dimiliki akan berfungsi sebagai tempat penyimpanan data. dengan kata lain data yang kita simpan kedalam harddisk akan di stripping keseluruh harddisk anggota dari RAID 0 tersebut.
Contoh : 4 Harddisk SCSI berkapasistas 72GB per Disk di configure dengan RAID 0 maka total harddisk yang dapat dijadikan penyimpanan data adalah keseluruhannya ( 4 x 72 GB)
Kelebihan : Dengan RAID 0, kapasistas harddisk yang dimiliki untuk penyimpanan data adalah total dari keseluruhan harddisk yang dimiliki, tanpa ada pengurangan

Kekurangan : Jika salah satu harddisk fails dalam RAID 0, maka data akan hilang tanpa ada penggantinya.

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