[mythtv-users] RAID 1 mirror with mythtv backend???

Will Dormann wdormann at gmail.com
Fri Jan 25 23:37:53 UTC 2019

On 1/24/19 12:05 AM, Stephen Worthington wrote:
> Those are CRC errors, and in a large quantity like that they are
> normally indicative of a bad SATA cable (or one that is not firmly
> plugged on).  Or possibly a USB cable problem in this case.  Dirty
> connectors will also show up like this, and having the cat tread on
> the cable can also do it.
> If the cable is OK, then the next most likely candidate for the cause
> is a bad SATA port.

I concur here.   From your SMART report:

  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail 
Always       -       0
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age  
Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age  
Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age  
Offline      -       0

All of your raw values (the last column) are 0.   This implies that the
drive itself is internally fine.  Which generally leaves the SATA
controller and/or cable.

Additionally from your report:
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 1.5 Gb/s)

I assume that your controller is only SATA 1.0?   If not, then that's a
likely sign that your cable is bad enough that the drive negotiated down
to a slower speed due to unreliable communications.


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