Thursday 2 June 2011

Sandisk and Diskeeper show off mini-SSD ExpressCache system











Sandisk is showing a wide range of storage devices at Computex Taipei, but this one caught our eye. It uses a very small solid state disk (SSD) with a capacity of just 8GB, along with some software called ExpressCache from Diskeeper Corporation to cut the time taken to launch programs or Windows.

Excerpted from http://www.computeractive.co.uk

Wednesday 18 May 2011

Been told that you don’t need to defragment when adding a SAN environment into your network estate?



With massive electronic data growth occurring today, there is now a much greater need for storage. SAN is at the forefront for most storage solutions and providers such as HP, IBM and NetApp, to name a few, are providing the necessary platforms to cater to this. Virtualisation and cloud solutions are promising less hardware in this respect, but data storage if held locally, will inevitably mean acquiring more hardware. This additional hardware is where the problem will lie in terms of cost for many companies today.


Diagram of Disk I/O as it travels from Operating System to SAN LUN

It stands to reason then that making full use of your SAN potential is vital. A common misconception related to SAN storage environments is that they don’t suffer from fragmentation related issues. This is the “party line” being handed out by many of the storage providers. There are plausibly a couple of reasons for this. Firstly, that each SAN provider will have their own propriety logic when it comes to arranging blocks within the SAN environment, and secondly, which is more likely, is that they get to sell more hardware to their customers.

To understand this a little better, every file system is a "virtual" disk, stacking one virtual component over another (i.e. one file system on top of another). What the vendor of a SAN file system does at their SAN file system level is irrelevant to what the Windows file system does underneath ― all Windows file systems fragment, regardless.

SANs typically employ a clustered/SAN file system to pool disk arrays into a virtualized storage volume. This is not Windows NTFS, but rather the proprietary software, provided by a SAN hardware or software vendor. Claims that "you do not need to defragment" may be misunderstood and incorrectly implied to mean "Windows NTFS"― NTFS always needs to be defragmented. It is very possible that you do not need to defragment the "SAN file system". Tips, best practices and SAN I/O optimization methodologies should always be gotten from the respective SAN vendor.

SANs are only ever block-level storage, they do not know what I/Os relate to what files. Therefore they cannot intelligently spread the fragments of a file across multiple disks. A whole mass of separate I/Os writes/reads for fragmented files (which will most certainly be interspersed with other simultaneous data writes/reads) will non-optimally be spread across the disks in the SAN storage pool.

As for NTFS, it still fragments and causes the Windows OS to "split" I/O requests for files sent into the SAN, creating a performance penalty. You can measure this using the Window's built-in PerfMon tool and watch the split I/O counter. You can also use the Average Queued Disk I/O, given that you account for the number of physical spindles.

The only solution offered by SAN vendors to address the split I/O problem is adding more spindles. This solution would mask the problem by dispersing the I/Os across the additional disks. This would mean you will need to add more disks as the I/O bottle neck increases, which would, over a period of time.
The actual problem lies at the NTFS level, for every fragment of a file is a separate I/O that has to be generated to access it. The less fragmented a file is, the less I/Os are required to access the file, compared to when it is heavily fragmented.

For more information see Windows IT Pro whitepaper entitled “Maximize the Performance of your Windows SAN Infrastructure”.

Monday 9 May 2011

The Secret to Maintaining SSD Performance



HyperFast SSD Optimizer

Why your Solid State Drive is not as fast as it used to be

By: Mandeep Birdi, Technical Consultant

SSD hard drives are becoming increasingly more popular. Many portable devices such as laptops, PDA's, Tablet PC's and Netbooks are being used with SSDs. Although prices are still astronomically high - a 1TB SSD setting you back a mere £3000 - sooner or later the prices will fall into a more accessible range and they will become far more widely used.

Of course solid state drives have several distinctive advantages. Faster access times, lower power usage and rather pleasingly, run completely silent. The main disadvantage, although possibly undetectable at first, is over time you'll probably start to notice the write speed slowing down - even slower than those of conventional hard drives.

Solid state drives can access any location on the drive in the same amount of time. This is one of the key features over hard drives. So there is no fragmentation problem with SDDs regard to "reading" files.

There is however still a problem with the fragmentation of the free space that will seriously affect the performance of SSDs. These drives have actually been designed to write data evenly in all sectors of the drive which the industry is calling "Wear Leveling". Each sector of a solid state drive has a limited number of writes before it cannot be overwritten anymore.

Unlike a magnetic storage device which can record new data directly on top of old data, an SSD must first erase the contents of a previously used memory cell to zero out its contents before the new data can be written. This slows down the speed and is what prompted both Microsoft and SSD manufactures to create the solutions known as TRIM and Garbage Collection. These functions can perform these types of clean up tasks in the background when certain conditions are met.

Unfortunately, TRIM and Garbage Collection doesn't have anything to do with addressing how the free space is allocated by the NTFS file system and most SSDs suffer from free space fragmentation due to inherent NAND flash limitations. This is where you need a method to optimize the SSD. By ensuring that the small sections of free space are better managed, you can cause files to be written in their optimum condition requiring the least number of I/O operations. This also benefits subsequent reads of these files and improves the overall access times across the board. SSD are without question extremely fast, but you will never get the full potential of the speed over time as promised unless you keep it optimized.

Optimizing your SSD - HyperFast Technology

HyperFast® technology only concerns itself with the fragmentation of files and free space caused by the NTFS file system and not that of the physical placement of data on the SSD. HyperFast reduces the amount of writing and as a result improves the write times and the life span of SSDs - therefore quite complimentary to the purpose behind wear-leveling strategies.

The HyperFast product (an add-on to Diskeeper) is designed to consolidate free space when it is needed, without "over" doing it. HyperFast is unique as you do not ever need to manually analyze or manually run, or even schedule it. It is smart enough to automatically know what to do and when. More information at http://www.diskeeper.com/hyperfast

Monday 9 November 2009

Translations can be a funny thing!

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How robotic and unprofessional translations can really get you in trouble!

The written word is a funny thing. It's a symbol of the sound you make with your voice. Different countries obviously have different sounds for the same object and actions - and that's tough enough, but you can really get into trouble if you only translate robotically (such as with translation machines) or without a proper (and especially professional) understanding of the language you are translating into.

If you are looking to approach foreign markets and need to communicate in a foreign language, then you would do well to take into account the hundreds of hours that you have spend on your marketing campaigns, or the literature describing your product or service. To have this wasted with a poor translation can be an expensive mistake.

Here are some mistranslations which are funny to read, but in a professional context you would not want to be on the other end of your enraged (or perhaps if you are lucky - bemused) boss' or client's response.

Take this one: When Coca-Cola first shipped to China, they named the product something that when pronounced sounded like "Coca-Cola." The only problem was that the characters used meant "Bite the wax tadpole". They later changed to a set of characters that mean "Happiness in the mouth." Pepsi didn't do any better when they translated their "Come alive with Pepsi" campaign into German and it ended up as "Come out of the grave with Pepsi."

No field is immune to mistranslation. Scandinavian manufacturer Electrolux translated their slogan into 'American' and came out with the rather ambiguous "Nothing sucks like an Electrolux." I think we have all read or come across poorly translated instructions in hotels and public places. In one hotel "The flattening of underwear with pleasure is the job of the chambermaid." - Although in Japan "You are invited to take advantage of the chambermaid." If you want to have a good time, then go to a Rome laundry where, in true Italian style, it offers "Ladies, leave your clothes here and spend the afternoon having a good time." Though in Zurich a rather primmer hotel directs clients, "Because of the impropriety of entertaining guests of the opposite sex in the bedroom, it is suggested that the lobby be used for this purpose."

All these, and many more, are the job of the translator to steer around. Certainly, when translating a technical or legal document, precision is vital. Translations have to be done by a professional who has a true understanding of the subject to which he or she is translating into.

In the worst-case scenario, what is at stake (and these have happened) is a mistranslation that has cost hundreds of thousands of pounds. Even if it is not of such proportions, certainly you do not sell your services or products well when even simple explanations come over garbled or in poorly constructed sentences.

In a foreign market where you are already at a disadvantage, it is vital to have presentations, texts and instructions all clearly and appropriately translated.

ETLS International is one of the newest members of CADIA. They have established a network of several hundred professional translators all around the world. Their translations, into all languages and most technical areas, are always done by specialists who have an intimate knowledge of the subject they are translating.

First published in Cadia Update, August 2009

ETLS International provides a fast and accurate translation service into all languages and technical areas. Their translations are always done by professionals who have specific knowledge of the specialist field of expertise required. In this way they ensure quality work is provided to their clients.

http://www.etlsint.com

Tuesday 4 August 2009

Use GoodNewsForPolarBears.org to give and get free stuff in your local community

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Global warming, rampant landfill, irresponsible governments, and commercial indifference,... - don't you wish there was *some* good news for polar bears?

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Wednesday 11 March 2009