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RAID


Fixing OnApp error “Cannot snapshot a degraded Vdisk”

Fixing OnApp error “Cannot snapshot a degraded Vdisk”

What if, your server suffered an unexpected hard disk failure and the entire data on your server suddenly vanished? You frantically look for ways to recover the lost data, only to find that there are no backups available.

A single disk failure instance has turned out to be detrimental to your business. Data loss due to disk failures, human errors or virus attack can lead to business downtime and financial loss.

In spite of that, many business owners tend to overlook this risk and skip the backup process, leading to catastrophic events. For every business that depends on data availability, it is therefore very critical to safeguard and backup data. (more…)

Safe data recovery : Dos and Dont’s of rebuilding RAID arrays in data centers after a hard disk drive failure

Safe data recovery : Dos and Dont’s of rebuilding RAID arrays in data centers after a hard disk drive failure

It is unwelcome, it is tedious, but it is inevitable.

Every service provider dreads a hard disk crash, and the downtime it can lead to, but it is one eventuality that will happen sooner or later.

Today was one such day. A high priority alert notified our Dedicated Linux Server Administrators about a degraded RAID array in a data center we managed. Hard disk crashes are a P0 (highest priority) alert in our infrastructure management procedures, and initiates an emergency response.

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Guide to RAID(Part III/III)

The ability to make choices based on facts and analysis, has always been a challenge for a person managing IT infrastructure. Much of this hardship can be attributed to the day to day advances in technology, and stiff markets.

Out here, we help to make one such choice – that of choosing Hardware or Software RAID. Earlier we ventured into basic concepts of RAID and comparison of various RAID levels. Here we describe and compare hardware and software RAID solutions.

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Guide to RAID(Part II/III)

Adopting a specific RAID technology, involves finding the right implementation that meets all your requirements. It is more or less, striking a balance between cost of devices, performance, and fault tolerance.

Apart from the big decision of selecting either hardware of software RAID, which I will cover in my next blog, selecting RAID levels is the first step.

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Guide to RAID(Part I/III)

A term coined decades ago, RAID is essentially, disks arranged in a manner to protect the information they contain – simply by adding redundancy.

While there are multiple expansions for RAID – Redundant Array of Inexpensive Disks, which has now transformed to Redundant Array of Independent Disks, the aim is essentially to protect the data and RAID achieves this, by not putting all the data into a single disk.

Performance of storage media, gains a lot of importance in cases where data in the media is to be constantly read from, or written to. Many a time, the bottleneck in a computing environment is related to this input/output performance. Most RAID configurations provide performance enhancement that make it a popular option of SME’s and web-hosts.

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Backup and Recovery Strategy for a Webhost

There are two major events that haunt every Webhost. One is the ghastly image of the word “HacKeD” popping up on all of the sites on their server, usually accompanied by a skull. Neon green always being the color of choice. The second is usually in the form of a mail or phone call informing you that the hard drive on your server just went bust. As far as problems for Webhosts go, these rank right up there with “Houston…we have a problem.”

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