RAID Array Degradation Isolation

25 pts.
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Hard drives
RAID
If you have 4 separate RAID 5 arrays, would a hard drive failure in one of the arrays affect only the performance of the one array and the others would remain unaffected?

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  • Subhendu Sen
    Have you checked the power that could be one of the cause. There are several reasons behind this issue. Check whether raid has a single controller cause nowadays, most raid server has a single controller. Perhaps, failure will result in catastrophic single point of failure. It is also found that frequently power failure may corrupt the raid configuration setting of nvram in the controller card.
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  • Netbui
    The question is theoretical. I have not created the arrays yet. They will be residing on one server with one controller. If one of the drives fail in one of the arrays would the performance degradation apply only to that array and not the other 3 for throughput during rebuild.
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  • Netbui
    Wow. Thanks for the insight. I have searched for a good solid answer but are unable to find one. I have read and understand RAID levels, mirroring, striping, etc but am unable to find the answer to my question. It's a simple yes or no question. I didn't think it was that hard for you to answer but thank you anyway. I will try a different site.
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  • Rich Castagna
    If all of your drives are on the same controller, anything that would affect the performance of one RAID group on that controller is likely to have some effect on the other groups.
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  • TheRealRaven
    Performance is likely to be isolated to the single array. But it depends on what you mean by "performance", how the total system is configured and possibly other factors.

    "Performance" within the scope of the single RAID array will be somewhat degraded, while performance within the scopes of the other arrays will be mostly unaffected. But "performance" of the overall system is less clear.

    You might have a database with elements that reside on multiple arrays. A procedure that updates multiple tables may need updates to failing and non-failing arrays.

    An array-by-array answer can be a fairly simple 'yes or no'. A live scenario can be much more complex.
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