What is Data Recovery?
The process of salvaging data from failed, corrupted, inaccessible secondary storage or any other media when it is not accessible as normal operations is termed as data recovery. Damage may be physical or logical. Physical damage is classified as some kind of an impact on the media or device itself, examples of logical damage include file system corruption , host operating system issues etc.
More often than not, environments which are setup on a single OS with single partition or disk are susceptible to data corruption. In such cases, the single point of focus is to replicate and copy all the required files from the damaged host device to another media. Employing a live CD which helps mount the system drive and removable media or other backup disks is the most popular way of recovering data after which it is moved to an external source – this could be a backup media with a file manager or an optical disc authoring software. Preventing such kind of data corruption is possible through partitioning of disks and storing an off server copy of mission critical data on a different partition from the replaceable OS system files.
Data recovery is generally divided into four different phases – each of them representing different levels and recovery abilities.
Phase 1: Repair the hard drive
Phase 2: Image the drive to a new drive or a disk image file.
Phase 3: Logical recovery of files, partition, MBR, and MFT.
Phase 4: Repair the damaged files that were retrieved.
Every phase necessitates using a different combination of hard disk repair and data recovery tool and ha to be carefully executed to ensure optimum data recovery. Depending on the complexity or simplicity of the damage, one may opt to override Phase 1. However, Phase 2 should NEVER be jumped – whatever may be the scenario. Any slip up in the methodology deployed may result in irrecoverable data loss
What is Disaster Recovery?
Disaster Recovery also knows as “DR” has its core attention on ensuring that all mission critical technology systems supporting a business keep functioning irrespective and in spite of any disruptive event which may occur. As IT systems have become increasingly critical to the smooth operation of a company, the importance of ensuring the continued operation of those systems, and their rapid recovery, has increased.
Any and every DR strategy would have to be based on the continuity plans in place for the organization’s business. All pertinent metrics and thresholds including recovery point objective (RPO) and recovery time objective (RTO)would be based on this BCP (Business Continuity Plan) employed by the business’ stake holders. Off-site data replication using a DAS, SAN or NAS device is the most popular and swiftly implementable disaster recovery plan. Hybrid cloud solutions which replicate data both on-site and off-site are fast catching up as part of new age disaster recovery methodologies. These solutions provide the ability to instantly fail-over to local on-site hardware, but in the event of a physical disaster, servers can be brought up in the cloud data centers as well.
While DR is a dependable service and should be budgeted for by every organization, precautionary in-house measures preventing an occurrence of a disaster should also be adopted by every business. Depending on individual organizational needs and core competencies, one may opt to outsource DR to a specialized datacenter or service provider. Increasingly, cloud computing and cloud based solutions are being put to use by DR specialists and datacenters keeping in view the flexibility and usage versatility of cloud based cluster environments.
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