What is UDMA_CRC_Error_Count?

R

Red Squirrel

[H]F Junkie
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Nov 29, 2009
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I just added a brand new drive to my server, did a smartctl so I could pull off the serial and model number as the OS sees it so I can inventory it, and noticed the CRC errors... is this a bad thing? My other drives don't have this number. I'm afraid I might have to RMA it... I have the worse luck with that. To add insult to injury I paid extra for express shipping.

Code: 
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000b   100   100   016    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0005   100   100   054    Pre-fail  Offline      -       0
  3 Spin_Up_Time            0x0007   100   100   024    Pre-fail  Always       -       257
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       6
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   100   100   020    Pre-fail  Offline      -       0
  9 Power_On_Hours          0x0012   100   100   000    Old_age   Always       -       0
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       6
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       6
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       6
194 Temperature_Celsius     0x0002   253   253   000    Old_age   Always       -       22 (Lifetime Min/Max 21/28)
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
199 UDMA_CRC_Error_Count    0x000a   198   198   000    Old_age   Always       -       2
 
Don't sweat that number too much. It just means there was an error transferring data from the disk to the machine for some reason--e.g. electrical interference or a faulty cable. Pretty minor issue.

If it increases more, perhaps try replacing the cable. I've got an older drive and the value is 11, but the drive is fine.

A CRC error actually means that the transfer error was detected, so the drive was able to take appropriate action, e.g. by retransmitting the data. That's a good feature to have, since the drive knows if the data didn't make it to the machine. No information was lost and this problem should not lead to stability issues unless it's extremely bad.
 
Cool I was hoping that's all it was. Guess if it was a very bad cable or other issue that number would just skyrocket to the point where I'd lose the drive but the drive itself is not actually dead, right?

It could very well be there was lot of dust in the bays, I blew it out and put the drive back in, did not see any other errors pop up but to be safe I will make it standalone and just transfer a bunch of data to it.
 
Well here we go, of course I have to do this now and I will have trouble sleeping tonight. LOL

Code: 
Personalities : [raid6] [raid5] [raid4] 
md0 : active raid5 sdf[3] sdg[4] sdb[0] sdd[2] sdc[1]
      1953519872 blocks super 0.91 level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]
      [>....................]  reshape =  0.5% (5223040/976759936) finish=1247.9min speed=12972K/sec
      
md_d0 : inactive sde[0](S)
      976762496 blocks
       
unused devices: <none>

Growing raid5 by 2TB using the two new drives to make a total of 5 drives.
 
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