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Thursday, September 01, 2011

Aplikasi LMS yang tangguh



Dalam salah satu diskusi dengan para pengembang aplikasi Learning Management System (LMS) khususnya adalah DOKEOS, hal menarik yang mereka sampaikan adalah mereka baru saja menyelesaikan pekerjaan dengan Kementrian Pendidikan Thailand (Ministry of Education of Thailand).  

Website yang ditunjukan adalah http://www.noeplaza.org. Website ini saat ini (Sep 2011) melayani hingga 100.000 user dan mereka akan mengarah hingga 1 juta user pada tahun ini juga. Dokeos sendiri juga memiliki beberapa versi, ada yang opensource dan versi Pro. Versi Pro inilah yang disarankan untuk digunakan, tentu saja tidak gratis dan biayanya cukup mahal, tapi bila dibandingkan dengan manfaatnya, tentu lebih banyak manfaatnya.

Silahkan mencoba dan menggunakan aplikasi ini, dapat didownload disini (www.dokeos.com). Sedangkan untuk implementasi dan pengayaan kontennya, dapat menghubungi kami.

Dokeos or Dokeos PRO?

Dokeos is the Open Source alternative  Learning System.
  • Dokeos – Open Source, will always be free of charge
  • Dokeos PRO – Open Source with commercial support and extended features

Redundant Array of Independent Disks (RAID) dengan QNAP

Solusi QNAP Turbo NAS merupakan solusi yang mudah, murah dan terjangkau untuk mengembangkan NAS (Network Attached Storage). Dengan adanya NAS, maka kita dapat dengan mudah melakukan backup atas data-data kita, baik yang ada di PC ataupun server ke server NAS ini. Salah satu fitur yang harus ada di tiap NAS adalah RAID. Fitur ini akan sangat membantu apabila terjadi kegagalan dalam perangkat harddisk yang ada.


QNAP Turbo NAS series provides from 2-bay to 8-bay models for users to execute advanced RAID configurations. The high end 8-bay NAS supports RAID 0, 1, 5, 6, 10, 5+hot spare, 6+hot spare, 10+hot spare configuration. Considering the performance gain and extra redundancy, users can choose the most appropriate RAID configuration according to the demands to reduce the risk data loss caused by hard disk failure. QNAP NAS supports advanced RAID configurations and multiple RAID volumes on a single NAS:
  • RAID 0 (Disk Striping): performance gain but without redundancy

    RAID 0 (striping disk) combines 2 or more hard drives into one larger volume. The data is written to the hard drive without any parity information and no redundancy is offered.
    If you install four hard drives in the Turbo NAS and format the drives as “RAID 0”, the total capacity of the volume is 500GB x 4 = 2TB.

  • RAID 1 (Disk Mirroring): allows one disk failure

    RAID 1 duplicates the data between two hard drives to provide disk mirroring.
    If you install four hard drives in the Turbo NAS and format each pair of hard drives as “RAID 1”, the capacity of each RAID 1 volume is 1TB (500GB + 500GB). The total storage capacity of the NAS is 2TB.

  • RAID 5 (Disk Striping with parity): allows one disk failure

    The data are striped across all the hard drives in a RAID 5 array. The parity information is distributed and stored across each hard drive. A minimum of three hard drives is required.
    If you install four hard drives in the Turbo NAS and format the drives as “RAID 5”, the total capacity of the volume is 500GB x (4-1) = 1.5TB.

  • RAID 6 (Disk Striping with 2 parities): allows two disk failure

    The data are striped across all the hard drives in a RAID 6 array. RAID 6 differs from RAID 5 that a second set of parity information is stored across the member drives in the array. The total capacity of RAID 6 disk volume is equal to the size of the smallest disk in the array x (no. of hard disks-2). RAID 6 tolerates failure of two hard drives at the same time.
    If you install four hard drives in the Turbo NAS and format the drives as “RAID 6”, the total capacity of the volume is 500GB x (4-2) = 1TB.

  • RAID 10 (Disk Mirroring and Striping): allows one disk failure from each RAID 1 pair

    RAID 10 combines four or more disks in a way that protects data against loss of non-adjacent disks. It provides security by mirroring all the data on a secondary set of disks while using striping across each set of disks to speed up data transfers.
    If you install four hard drives in the Turbo NAS and format the drives as “RAID 10”, the total capacity of the volume is 1TB (500GB+ 500GB).
In addition, single disk and JBOD volumes are also supported for flexible configurations.

Wednesday, August 31, 2011

The Happiness Imperative: 4 Steps to Satisfied Help Desk Customers

Posted by ITSM Guy on Jul 27, 2011 8:42:04 AM
We’ve all heard the jokes about the “helpless desk.” Employees complain about the lack of service. Help desk staff lament the lack of respect. The fact is the help desk represents a huge opportunity. It occupies critical real estate in the enterprise. It’s where IT meets the business, and ultimately, cements the impression that many employees have of the IT department as a whole. Keeping your help desk customers happy fuels business productivity and ensures the IT department is viewed as a valuable asset.
 
Boosting your help desk customers’ happiness quotient (HQ) is no small task as customer expectations of service and of receiving service are at an all-time high. Outside of their day jobs, a new generation of customers relies on emerging technologies for unlimited connectivity, mobility and access to unprecedented volumes of information, uninterrupted communication and 24/7 service. They anticipate the same conditions in the workplace. It’s this expectation that has helped spawn a much-talked-about trend: the consumerization of IT.
 
In a recent InformationWeek piece, columnist Jonathan Feldman wrote, “Consumerization is banging down the door of IT.”He continued, “…the CIOs I talk with do get it, but they're vastly outnumbered by their staff, and staffers don't necessarily get it yet. CIOs are going to have to take the time to educate their staff in what consumerization is, why it's not going away, and how it may even make their lives easier or better."
 
IT organizations that are serious about improving help desk service—and reputations—will embrace this new reality. The good news is that they don’t have to break new ground to get started. Companies in the business-to-consumer space are already blazing those trails, adapting to the ever-changing expectationsof their always-on, always-connected customers. Their best practices translate well to IT help desk principles.

How? Here are four steps to help you get started:
 
1] Help customers help themselves
Today’s help desk customers are technically savvy. They have come to expect service that’s timely—often, instant—effective and on their terms. If it doesn’t meet their expectations, they will seek resolutions on their own.
 
This does not bode well for the help desk’s reputation and can result in ineffective,even destructive, work-arounds that end up haunting IT staff.
 
Enter self-sufficiency. A self-service infrastructure allows customers to create and resolve their own incidents, freeing help desk staff from tending to the most repetitive, time-consuming incidents. This means, for example, allowing your customers to reset their own passwords and update tickets. SRMconsole.png
 
Asyou learn how your customers are using self-service, you will gain greater insight into their needs. You will also feel more comfortable about accommodating them, in a consistent, highly controlled manner. Then you can expand your service offering, allowing customers to submit hardware and software requests or providing systems access, for example. The result: Your customers enjoy greater flexibility and responsiveness, while your IT staff improves efficiency and control.
 
2] Promote transparency
Self-serviceworks when there is transparency. In other words, customers must have access to useful information that helps them resolve their problems (preferably delivered in compliance with ITILbest practices).
 
For example, how many tickets are opened when there’s a system-wide outage in your organization? Why not give your customers a way to find out if their problems spring from a universal issue before logging a ticket? Broadcast the details associated with IT issues that are currently impacting the organization and let your customers see what other employees are searching for. Give them access to a shared knowledge base to troubleshoot their own issues, while ensuring helpdesk staff can tap a broader knowledge base that archives past responses to customer questions and requests.
 
Transparency can have a halo effect, too. As customers have more access to and visibility ofthe information they need to resolve their issues, their level of trust in theIT organization grows. This can help break down the barriers between IT and thebusiness.
 
3] Make them feel at home
Today’s help desk customer represents a younger generation used to live chat, instant messaging, online discussion forums, tweets and status updates. By providing them with the tools and channels that resemble those they rely on every day,they can engage with IT on their own terms. They may even come to regard IT as a partner, invested in their success.
 
For example, with real-time collaboration tools, they can see where their peers are having trouble and how they’re resolving issues. When they’re operating in their own comfort zone, they’ll reach positive outcomes more quickly—and without the angst associated with processes that have been thrust upon them.
 
4] Hold yourself accountable
Thanks to the Internet, mobile devices and social media, word of mouth plays a greater role than ever in influencing reputation. The help desk is not immune. Your customers can quickly share their satisfaction—and disappointment—with your service. All it takes is a text here or an instant message there to compromise your reputation. By establishing a few accountability controls upfront, you can stave off the need for damage control later.
 
Startout by setting realistic service levels and soliciting buy-in from the business. Next, ensure your help desk is adequately staffed and skilled to deliver. Keep your customers in the loop by publishing the details of those service levels and clarifying expectations at every interaction.
 
Maintain open communication with your customers. Survey them on a regular basis to find out what’s working and what could be improved. Act on their recommendations and close the loop by reiterating their recommendations and sharing your resolutions.
 
Historically,the help desk has been home to a cultural divide. Those who staff it own the knowledge crucial to keeping the business moving forward. Their customers, increasing technically adept, are beholden to them. Sometimes, it seems like never the twain shall meet. To ensure they do, however, communication is key.  That means embracing a new market reality and aligning help desk infrastructure and processes with evolving customer behaviors and expectations. Done right, it can boost everyone’s HQ.
 
See this in action with some really cool videos!

Monday, August 29, 2011

Solusi Pengaturan Udara Data Center dengan TATE

Selain menggunakan Precision Air Conditioning (PAC), kita akan mengenal juga solusi pengaturan udara / sirkulasi di ruangan Data center. Salah satu solusi yang ditawarkan adalah menggunakan produk dari TATE. Berikut solusinya.
 
DirectAire™ & DirectAire™ X2
The High Density Directional Airflow Solution for Data Centers

Unlike other grates the DirectAire and DirectAire X2 angle the airflow toward the server rack to significantly reduce bypass air. DirectAire is designed for a one-to-one pairing with a standard 42U rack while DirectAire X2 is intended to provide even airflow delivery to racks on either side of the cold aisle in a legacy data center that has only one accessible airflow panel. Both offer the same directional airflow, strong durable design and improved energy performance.

The elimination of bypass air saves operating expenses in existing facilities and reduces capital expenditures on cooling equipment in new facilities. DirectAire's superior load performance is ideal for retrofit and new construction, easily integrating into your existing raised floor system.




DirectAire
Key Performance Characteristics
  • Directional air flow achieves a 93% total air capture
  • Pressure equalizing diffusion blades
  • Cools over 25kW per rack
  • 68% open area delivers 2,600CFM @ .1" H2O
  • Reduces capital expenditures on cooling infrastructure by 40%
  • Over 40% annual fan energy savings
  • 2,500 lbs design load boosted to 3,000 lbs with HD stringer
DirectAire X2
Key Performance Characteristics
  • Allows for directional airflow delivery to two racks when the existing cold can only accommodate one airflow panel.
  • Capable of cooling >14kW per rack due to evenly split nature of directional airflow paths.

Total Air Capture & Data Center Airflow

Total Air Capture (TAC) rate refers to the amount of air delivered through the airflow panel that is then captured by the server rack. The server rack profile below represents a standard 24" x 76" server rack. Lines have been added to show the three zones of the server rack. Zone 1 represents the bottom of the rack closest to the floor and Zone 3 represents the top of the rack farthest from the air supply. You will notice that the DirectAire grate delivers 93% of it's 2,600 CFM at .1" H2O to the face of the server.The data reported on the smoke test images below show the distribution of airflow through both panels for each zone in a 42U rack. You will notice the airflow through the DirectAire grate is spread evenly across the three zones of the rack. When racks are placed 6" from the edge of a DirectAire X2 panel as shown the airflow is divided evenly between the two adjacent racks.
DirectAire
2600 CFM Delivered @ .1" H2O
2420 CFM Captured
93% TAC
DirectAire X2
2840 CFM Delivered @ .1" H2O
2752 CFM Captured
93% TAC
The DirectAire smoke test above shows directional airflow path and air capture rate per zone at the face of a standard 24" x 76" server rack. The DirectAire X2 smoke test above shows directional airflow path and air capture rate per zone at the face of a standard 42U server rack.


Eliminate the Burden of Airflow Containment

Containment systems in a data center come with many challenges including fire code requirements, service distribution restraints and limited flexibility. Unlike other panels which throw air straight up in a vertical plume the DirectAire’s angular throw evenly distributes the majority of the air it delivers directly to the face of the rack providing effective containment when used in conjunction with best practices.
DirectAire’s 93%TAC rate enables you to gain near peak airflow without containment.DirectAire X2 enables you to maximize airflow in aisles with a single row of airflow panels without containment.Typical airflow panels require containment systems to ensure maximum airflow to the racks.


High Density Cooling Capacity

DirectAire’s ability to deliver high volumes of air directly and evenly across the face of the server rack gives it the unique ability to handle very high density equipment. The table below lists cooling capacities per rack based on a mathematical calculation for systems without containment.
(CFM x Total Air Capture %) / 120 (CFM need to cool 1kW @ 25°F ∆) = kW per rack.
DirectAire™ & DirectAire™ X2
CFM & Cooling Capacity
Pressure
(in. H2O)
CFM
DirectAire
kW/Rack (93% TAC)
DirectAire X2
kW/Rack (93% TAC)
.02
1151
8.5
4.2
.04
1626
12.0
6.0
.05
1844
13.6
6.8
.06
2007
14.8
7.4
.08
2318
17.1
8.6
.10
2594
19.1
9.6
.12
2823
20.8
10.4
.14
3027
22.3
11.2
.16
3217
23.7
11.9
.18
3378
24.9
12.5
.20
3433
25.3
12.7
*Cooling capacities were calculated using the following formula:
(CFM x Total Air Capture %) / 126(CFM needed to cool 1kW @ 25ºF ) = kW per rack.

Strong & Durable

Both DirectAire’s feature all steel construction making them the strongest airflow panels on the market. With a 2000 lb Rolling Load, 2500 lb Design Load and a Minimum Safety Factor of 2.0 equipment can be moved over the airflow panels without worry.
DirectAire™ & DirectAire™ X2
System Performance Criteria*
Unerstructure
System
Weight
(lbs/ft2
)
Static Loads
Rolling Loads
Impact
Loads
(lbs)
CFM
(.10" H2O)
Total
Air Capture
Design
Loads
(lbs)
Safety
Factors
10
Passes
(lbs)
10,000
Passes
(lbs)
Bolted Stringer
13.0
2500
Min>2
2000
2000
200
2600
93%

*System load tests are conducted following CISCA's Recommended Test Procedures with the exception of Design Load. Design Load is a CISCA Concentrated Load Test performed on actual understructure using yield pint and safety factors in place of deflection.


Improve Data Center Financial Performance
DirectAire maximizes the financial performance of any new or existing data center. The precise delivery of air reduces bypass airflow allowing new facilities to reduce the number of CRAH units. Retrofits can set CRAH units with fixed speed fans to standby mode or adjust variable fan drives to operate at a lower static pressure, saving energy. Likewise the 93% TAC rate eliminates the need for a full containment system. The facilities overall cooling capacity will also be improved allowing for the addition of IT equipment without the capital investments on infrastructure.