Data Recovery Swindon

The UK recognised data recovery service provider DiskEng, offer data recovery services across the entire UK from our laboratory facilities which are located in the Oxford Science Park in Oxford.

Our services include, the provision of guaranteed data recovery, RAID recovery and disk recovery solutions for businesses, institutes and government agencies based in and around the Swindon area including Royal Wootton Bassett, Coate, Wroughton, Wanborough, South Marston, Lydiard Millicent, Shaw, Purton, Liddington, Chiseldon and others.

Swindon is a large town in northeast Wiltshire in southwest England. Swindon (Population in 2011: 185,609) is located midway between Bristol 35 miles to the west and Reading 35 miles to the east. Oxford is located about 40 miles northeast of Swindon with London 71 miles to the east. The building of the railways was important to the development of Swindon, being on the main Great Western line as a major transport junction. The Great Western coachworks were opened in Swindon, beginning the town’s long association with Isambard Kingdom Brunel.

Swindon Data Recovery UK

The original settlement of Swindon, dating back to Anglo-Saxon times was located on top of a limestone hill, providing a defensible location. Reference is made in the Domesday Book with the town referred to as Suindune, possibly meaning “pig hill” from the two Old English words swine and dun. Until the middle of the 19th century Swindon was small market town. The Industrial Revolution was a major factor in the growth of the town, initially with canals constructed to provide transport and haulage, before the construction of the Great Western line.

Swindon is now a centre for car production at the Honda car plant based on the former RAF base in South Marston and BMW/Mini in Stratton. It is also a base for several large communication and IT corporations, as well as many legal, insurance and financial services companies. All national Research Councils along with the British Computer Society are employers in the town.

Swindon provides a diverse range of industries, giving rise to a vast range of storage solutions, from the smallest USB devices, hard disk drives right up to enterprise level RAID arrays. Whatever the problem, DiskEng can provide a data recovery solution to suit your requirements, no device being too large to handle. Swindon is conveniently placed to provide easy access to the DiskEng laborary in Oxford via the A420. Recent comments by customers requiring data recovery in Swindon are below.

Testimonials

Swindon Data Recovery

In Swindon or the Wiltshire area and require RAID data recovery services? Contact DiskEng now to discuss your data recovery requirements with a data recovery specialist who will guide through the process.

Data Recovery Kent

The UK recognised data recovery service provider DiskEng, offer data recovery services across the entire UK from our laboratory facilities which are located in the Oxford Science Park in Oxford.

Our services include, the provision of guaranteed data recovery, RAID recovery and disk recovery solutions for businesses, institutes and government agencies based in and around the county of Kent including Sevenoaks, Dartford, Gravesham, Tonbridge and Malling, Medway, Maidstone, Tunbridge Wells, Swale, Ashford, Canterbury, Shepway, Thanet, Dover and others.

Kent is a county in the south-east of England, bordering London to the north-west, Surry to the west and West Sussex to the south-west. Kent is often referred to as the Garden of England due to an abundance of orchards and hop gardens. It is home to several ports including the famous Cinque Ports and Chatham Docks, with the entrance to the Channel Tunnel located near Folkstone.

Kent Data Recovery UK

Kent has been occupied from the Bronze Age, through the Iron Age and the Roman occupation. The name Kent is derived from the Brythonic word Cantus which means ‘rim’ or ‘border’. Canterbury Cathedral is home to the Archbishop of England, the head of the Church of England. Kent is home to a variety of industries, from cement-making, brick-making, engineering, aircraft design, paper-making. It is also home to a couple of nuclear power stations in Dungeness.

With an array of industries and educational establishments, Kent has a wide range of data recovery requirements, ranging from high-end enterprise storages solutions, such as NAS and SAN servers, through desktop and laptop hard disks, through to USB drives and sticks. Whatever the problem and type of system or device, DiskEng can provide a data recovery solution to suit your requirements.

The DiskEng laboratory in Oxford can be reached via the M25 and M40, or via fast rail services via central London. Recent comments by customers requiring data recovery in Kent are below.

Testimonials

  • RAID 5 Data Recovery Sheffield

    "Allowing our RAID array to run in degraded mode was a mistake. Many thanks to DiskEng for recovering our data, saving us from what could have been a disaster."

    Neil Tyler, Hallam Tech Consultancy, Sheffield

    Read more
  • RAID 5 NAS Recovery Kent

    "A failure of our Drobo NAS box brought some of our staff to a halt. Many thanks for the super fast recovery of our data, and the invaluable advice we will use to hopefully avoid any such issues in the future."

    Christopher Strauss, JG Bio-Engineering, Kent

    Read more

Kent Data Recovery

In the county of Kent and require data recovery services? Contact DiskEng now to discuss your data recovery requirements with a data recovery specialist who will guide through the process.

RAID “Write Hole” Phenomenon

If a power failure occurs during the write process to a RAID, the “write hole” phenomenon can be the result. This can happen in any RAID array including RAID 1, RAID 5 and RAID 6 whereby it’s impossible to determine which data blocks or parity information was not written to disk.

When this occurs it is undetectable and may go unnoticed resulting in problems at a later time. Although this situation is fairly rare, it can lead to serious problems, especially if a data recovery is required. This highlights why it is important not to become complacent, and think “I have a RAID, so I don’t need a backup” or you could suffer serious data loss.

Data Not Written

As already described, when a power failure occurs it is possible for some data not to be written to all the disks in a RAID array. With modern journaling file systems a power failure is not usually a problem, as any failed writes are still stored in the journal, but a RAID system may be performing many read/write tasks in parallel, which may lead to unusual timing issues.

If the data that was not written is a data block, when the file system is mounted, the journaling may well correct any issue, but any failure to write the parity stripe could cause a serious issue and go undetected until that parity data is required.

Resynchronisation Issues

Take a RAID 1 mirrored pair as an example, whereby data is written to a pair of disks, and a discrepancy is detected between them after a power failure, it is almost impossible to know which disk holds the correct version of that data. In a RAID containing calculated parity information, the same is also true when the parity data does not match the data blocks stored in a stripe.

This means that running a resynchronisation could consolidate the incorrect data as part of the RAID, leading to either corruption of file system data structures or file contents. Scheduled resynchronisation is recommended as part of RAID maintenance, but is not guaranteed to fix this problem. The act of writing data to the RAID will cause the parity in that particular data slice to be resynchronised.

Data Recovery and UPS

Installing an uninterruptible power supply (UPS) for a system running a RAID is the best choice when it comes to avoiding the “write hole” phenomenon. By doing this a controlled shutdown of the server can take place, avoiding the issue of file system corruption.

During data recovery from RAID systems, it is almost impossible to determine which disks hold the correct data if a “write hole” is detected. Through manual intervention it may be possible to resolve some of these issues, but others may be impossible to determine, so it’s important to reduce the risks of suffering “write hole” damage.

RAID 5 vs RAID 10

Redundant Array of Independent Disks (RAID) offers many benefits, from data read/write speed increase through to data redundancy. Each RAID level is a compromise between data security, hardware requirements and read/write speeds.

Your budget will be a big factor in determining which RAID level is most appropriate, but if there is no constraint, data security should be high on the list. No matter which RAID level is selected, it is important not to fall into the trap of thinking, ”I have a RAID, so I don’t need a backup,” otherwise your future will almost certainly include RAID data recovery.

RAID 10 Provides 100% Redundancy

RAID 10 stripes data across a set of mirrored pairs, and therefore requires double the number of drives, for the given capacity required. This provides full redundancy, but as with any RAID system, the failure of one drive could be closely followed another. If a mirrored pair fails at the same time, it will bring the RAID to a halt, so although this gives the best data security, there is still some risk.

RAID 10 can also in many instances provide faster read and write times, as there is no need to calculate parity. RAID 10 hardware is often set up to take the data read from the fastest responding drive. It is still possible in theory for a RAID 10 to run with 50% failure of the drives, providing a mirrored pair does not fail, but such action would run a huge risk to the integrity your data. RAID 10 is a common option for high availability servers, such as those running Exchange and SQL databases.

RAID 5 Offers Higher Capacity

RAID 5 stripes the data across the drives, with one drive in each data slice containing the parity information, which can be used to reconstruct the data for a missing drive. This means only the capacity of a single drive is used for redundancy, allowing for much larger data volumes, across the same drives.

A RAID 5 array can run in degraded mode if a single drive fails, but this causes both a performance hit, as well as putting your data at imminent risk. The failure of just one additional drive will cause the RAID to fail. RAID 5 is however still one of the most commonly used RAID array architectures.

Data Recovery Issues

Despite the mirrored drive pairs, RAID 10 arrays are still sometimes seen for data recovery. Providing failures are not ignored, whereby one drive in a mirrored pair could hold out-of-date data, RAID 10 offers a double chance of recovery for each data slice of the RAID, giving extremely high data recovery success rates.

Although RAID 5 arrays have a higher level of risk attached, the data recovery success rate is also very high, as it’s rare for the drive failures to be severe enough to cause the loss of large areas of the data volume.

Any redundancy for your data is certainly a better option than none, so the choice really comes down to budget, and how much risk you’re willing to take with the overall integrity of your data. This needs to be weighed against the possible financial harm your company would face, even for a temporary loss of data access.

Why Use RAID 5 Array

At one time largely seen as an enterprise only option, RAID 5 has become relatively cheaper, making it an option for small and medium sized companies who require a high capacity file server system.

DiskEng have extensive experience in dealing with data recovery from RAID 5 server systems, from the simplest three disk RAID right through to RAID arrays containing more than a dozen hard disk drives. Due to the complexity of RAID data recovery, an in-depth knowledge of the file system and the underlying RAID architecture are essential.

Compromise of Speed and Safety

RAID 5 stripes the data across the set of drives, which helps to increase the read/write speed. However, this is offset against the need when writing new data, to re-calculate the parity, which is also striped across the drives providing the redundancy.

For many years this was seen as the perfect compromise, and so successful was the hype, that many users failed to realise that a backup plan for their data was still essential.

Built-in Redundancy Allows RAID Array Rebuild

In the event of a single hard drive failure, the RAID 5 array is still able to operate in a condition known as degraded mode. The RAID 5 array must not be allowed to continue operating in degraded mode without further action, as a further failure which could be imminent, would result in a complete failure of the array.

The use of a RAID 5 array allows the failed hard drive to be replaced, and the data and parity information, can then be rebuilt to this new disk. This should be done immediately, as a failure of another drive would make RAID data recovery the only option available for recovering the files.

With disks now storing several terabytes, the time taken to complete a rebuild is considerably longer than with the much lower capacity drives available a decade ago. This increases the risk of a failure occurring during the rebuild, so it is wise to organise a contingency plan while this process is taking place, just in-case a data recovery service is required.

RAID 5 Data Recovery

In the event that more than one disk in a RAID 5 array, or even a failure of the RAID controller, professional help must be sought from data recovery specialists such as DiskEng, who understand both the file system and the underlying RAID architecture.

It is important to make the right decision, as the integrity of your data is paramount. The wrong choice could have serious consequences, for both your data and the future of your company.