Win7 mirrored volume resync take days to complete

I just built a new system of Windows 7 SP1 and I wanted to create a mirrored volume to store a large amount of data.  The system has three disks:

* A system of 1 TB drive

* 3 two red TB Western Digital WD30EFRX drives

I have set up two disks of 3 TB as a successfully mirrored volume and at first everything seemed fine.  I came just to check the disk manager a few days later, however, and I noticed that the volume status is "Failed redundancy" and one of the disks has a yellow exclamation beside him with a status of "error".  After a bit of web, research, he sounded like one of the disks had abandoned the volume for a reason, so I followed the instructions of TechNet to reactivate the disk (http://technet.microsoft.com/en-us/library/cc786839%28v=ws.10%29.aspx).  The volume immediately began resynchronization.

Although he seems to be synchronize successfully, I'm a bit concerned about how long it takes.  I expected to take several hours; maybe even a day since it's 3 TB RAID software.  When he started first sync there was no progress indicator, so I just let it go.  It's "rescyning" for over 2.5 days and a progress indicator just published - it is now 6% (screen shot included).  A few quick calculations indicate that, at this rate, all resync will take about a month.

I just can't believe that it is correct; I guess that something is wrong.  I got 10 TB software RAID arrays that have resynced in less than a day.  I don't have much experience with Win7 volumes in reverse, so I hope someone has an idea.  It is a new system with modern components; It's a multi-core with 8 GB of memory processor, these are disks SATA 6 Gbps, and system disk is separated from the mirrored volume.  Both drives pass SMART tests, and chkdsk reveals no error.  Hardware RAID is not an option.  Any ideas?

Thanks for the detailed answer!  I think that the question was probably due to a restart related to Windows Update as you suggest; I think that the system restarted automatically because of an update shortly before that I noticed the resynchronization.  Assuming that this is the case, it's a mystery why Microsoft has not fixed yet.

I finally gave up on crossed my fingers and just rebooted the system.  When he returned to the top it seemed to have already begun the process of resynchronization on its own.  I was disappointed at first that she had begun at the course early. However, I then noticed it was resynchronize much more quickly.  Performance monitor showed same much faster read and write speed, and in a few hours, full status indicator percentage was already well into double digits.  The resynchronization is complete after about 6 to 8 hours, which is all that I expected.  Since then, the volume status is 'healthy' and I restarted several times without additional problems.  I have no idea why restart magically solved the problem.

I guess that means I'll need to look at whenever the system reboots after you have applied an update and just hope that if this happens again, a quick restart will fix it.

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