February 6, 20242 yr Hello, I have one 18 TB parity drive that is showing - UDMA CRC error count. It just passed a parity check with no issues. Should this drive be replaced? I have 2 other 18 TB drives in an array. Thanks in advance for your time.
February 7, 20242 yr Community Expert Solution This is a connection problem sometime in the past. You can acknowledge by clicking on the SMART warning for that disk on the Dashboard page, and it will warn again if it increases. I usually just acknowledge the occasional CRC, maybe reseat the connector next time I'm in the case if I remember to. If it increases quickly you need to investigate. The drive firmware validates incoming data by doing a checksum. If the checksum doesn't match, CRC is counted. When this happens, data is resent, so usually there is no other problem. CRC might not even be logged as an I/O error. And some connection problems won't cause CRC because no data was received to checksum.
February 7, 20242 yr Author @trurl - thanks for your response. I did acknowledge the CRC and it says healthy as of now. I will watch it for a couple of days and if nothing changes, I will close this.
February 10, 20242 yr Author @trurl - parity drive still healthy after 3 days. I will continue to keep an eye on it. Thanks again for your help.
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