I have two drives in an Intel ICH10 RAID 1. They are not enterprise-level drives; just regular WD Caviar Black drives.
Recently, reading/writing to the mirrored volume has become extremely slow and the HDD light is on constantly. I suspect that this may be due to one of the disks becoming close to failure and attempting sector remapping. (See also What is the fastest way to force hdd to reallocate bad sectors and discard the data?). If this was an enterprise drive, it would fail quickly and cleanly, but this behavior is typical of consumer drives. Hence, it's not immediately clear which drive is bad.
Neither of the drives shows problematic SMART data (this is from the Intel SSD Toolbox which seems to be one of the few options for reading SMART data off an Intel firmware RAID):
First drive
Second drive
Unfortunately, the WD Data Lifeguard Diagnostic tool which is able to run SMART tests is completely confused by the Intel ICH10 RAID:
How can I tell which drive is the problematic one and swap it out?
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