Why RAID Exists
Hard drives fail - it is a question of when, not if. RAID, which stands for Redundant Array of Independent Disks, combines multiple drives so that the failure of one, and sometimes two, does not stop the system or lose data. Understanding the common levels helps business decision makers question vendor proposals intelligently.
The Levels That Matter
- RAID 0 - stripes data for speed with zero protection; one failed disk loses everything. Avoid for business data.
- RAID 1 - mirrors two disks; simple and robust for boot drives and small servers, but usable capacity is half.
- RAID 5 - stripes with single parity; survives one disk failure with good capacity efficiency. Rebuilds on very large disks are slow and risky.
- RAID 6 - double parity; survives two simultaneous failures and is our default recommendation for large capacity arrays.
- RAID 10 - mirrored stripes; excellent performance and resilience for databases, at the cost of half the raw capacity.
What RAID Does Not Do
RAID protects against disk hardware failure only. It does not protect against accidental deletion, ransomware encryption, file corruption, theft, fire or flood - every change is faithfully written across all disks, including the harmful ones. That is why RAID must always be paired with independent backup, ideally following the 3-2-1 principle of three copies on two media with one offsite.
How Tech Guru Helps
Within our assessment we review existing arrays, rebuild risk and hot spare policy. The proposal matches RAID level to workload and disk size, with INR costed options. Implementation configures arrays with alerting enabled, and support covers disk replacement and periodic verification.
Practical Guidance
Enable controller email alerts today - a degraded array nobody notices is the most common preventable disaster we encounter. For an array health review, contact us via app.techguru.co.in or +91-8800567676.
