Many data storage environments implement RAID into their environments for data protection purposes. RAID disk arrays are important for all storage environments, including small- to medium-sized businesses (SMBs), because they solve a key problem in any organization: hard disk drive failure. In general, if you have a hard disk drive failure or a non-recoverable read error, RAID enables you to keep accessing your data by adding redundancy. So you'll be able to continue accessing your data even though the hard disk drive it was written on is no longer available.
However, there are several drawbacks to using RAID disk arrays depending on the RAID level you're using in your data storage environment. For example, in RAID 5, if you have five drives, one is typically your parity drive. And if you lose a drive, you can recreate it. However, if you lose a second drive during recreation, you may lose all of your data. Also, the time it takes to rebuild a drive is extensive, especially if a lot of data is stored on it. In addition, performance during the rebuild process will drop significantly. Essentially, RAID arrays protect your data from most circumstances. However, there are significant drawbacks from using RAID.
Marc Staimer, president of Dragon Slayer Consulting, discusses the various pros and cons of using RAID arrays in an SMB data storage environment in this podcast. He also discusses the following topics regarding RAID:
- The advantages and disadvantages of using traditional hardware-based RAID controllers vs. software-based RAID.
- What's being done to speed RAID rebuild times.
- Examples of post-RAID products.
- The differences between the nine RAID levels and which ones are best suited for SMBs.
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Marc Staimer discusses RAID for SMBs
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For more information on RAID for SMBs:
- Read our RAID data storage tutorial.
- Find out how to choose the best RAID level for your SMB environment.
- Get advice from Greg Schulz on RAIDs for SMBs in his ask the expert response.
This was first published in February 2010