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intel raid controller issue?  Mirror drive fails.

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Last Modified: 2016-12-08
I have 2 of these in a RAID mirror.  They are in a Dell Precision T5500 workstation.  I am using the onboard Intel RAID controller - not an addon.  The system is running a retail gas station about 1 hour from my physical location.  One of the drives was apparently failed the other day and marked bad.  I do not know of a way to diagnose the drive live in the system, as the data lifeguard software can't see the specific drives when in a mirror, and can't diagnose them.  I marked the drive as normal, the other drive replicated to it, and everything seems to be fine again.  Do you have any suggestion as to why this may have happened?  My experience is that this happens often with consumer class drives that aren't meant to run 24x7.  I have several SCSI and SAS situations in Dell PowerEdge servers (per i5/i6 raid controllers), and this never happens.  I purchased WDC RE drives in an attempt to have the best solution for Sata drives.  I googled the issue - and many people on the Internet list the same issue.  Is the issue that the RAID chipset isn't strong enough?  I don't feel that there is likely anything wrong with the hard drive.
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