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Dual/mirrored HD question


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#1 deltacoolguy

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Posted 24 January 2012 - 02:45 PM

If you have two hard drives, intended to be mirrored, and an installed RAID controller, allegedly set-up properly... how would you know if only one hard drive is working? Just from a day-to-day usage, I mean.

I'm asking because I have my computer in for some work at a local shop, and I was informed that one of the mirrored HDs was physically disconnected. I never knew. All this time I thought I had back-up in the case of physical HD failure and I didn't.

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#2 rotor123

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Posted 24 January 2012 - 04:41 PM

Depending on the raid controller there may be software to monitor and warn if the raid array has a problem.

Many of them when you start the computer and watch the screen it will display the raid array status.

Keep in mind that a mirrored hard drive is no substitute for a backup of the drive.

Backups are to prevent data loss in case the array catches a virus or someone erases or modifies a file you need for example.

A Raid array is to allow the computer to continue to be used while the failed drive is replaced and prevent down time and not for backup.

With mirrored drives whatever happens, good or bad to the contents on one drive also happens to the other drive.

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#3 deltacoolguy

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Posted 24 January 2012 - 05:51 PM

Right. When I said "back up" I meant in the case of a physical hard drive failure, not corrupted files, viruses, etc.

Anyway, when my computer would go through the boot process it would note the presence of a RAID set-up, and said something about "degraded", which I always presumed meant that the secondary/"back-up" HD was in some sort of 'slave' status, if that makes sense.

#4 rotor123

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Posted 24 January 2012 - 06:07 PM

I could see you believing that if you had never seen it showing healthy, how would you know that wasn't the norm.

Degraded actually meant that there was a problem such as a failing or failed drive.

Now you know for the future. It should show healthy for status.

Good Luck

Edited by rotor123, 25 January 2012 - 10:21 AM.

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