RealActorRob Posted March 13, 2021 Share Posted March 13, 2021 Two 4TB drives in a DS4246 did fine on preclear but then rebuilding parity on to both (parity 2) failed with 800+ and 1200+ errors. 27 hr preclear ran and passed. # # Step 1 of 5 - Pre-read verification: [9:04:53 @ 122 MB/s] SUCCESS # # Step 2 of 5 - Zeroing the disk: [8:41:36 @ 127 MB/s] SUCCESS # # Step 3 of 5 - Writing unRAID's Preclear signature: SUCCESS # # Step 4 of 5 - Verifying unRAID's Preclear signature: SUCCESS # # Step 5 of 5 - Post-Read verification: [9:04:38 @ 122 MB/s] SUCCESS # # # # # # # # # # # # # # # ############################################################################################################################ # Cycle elapsed time: 26:51:13 | Total elapsed time: 26:51:16 # ############################################################################################################################ ############################################################################################################################ # # # S.M.A.R.T. Status (device type: default) # # # # # # ATTRIBUTE INITIAL CYCLE 1 STATUS # # Reallocated_Sector_Ct 0 0 - # # Power_On_Hours 55151 55178 Up 27 # # Temperature_Celsius 38 42 Up 4 # # Reallocated_Event_Count 0 0 - # # Current_Pending_Sector 0 0 - # # Offline_Uncorrectable 0 0 - # # UDMA_CRC_Error_Count 0 0 - # # # # # # # # # # # ############################################################################################################################ # SMART overall-health self-assessment test result: PASSED # ############################################################################################################################ --> ATTENTION: Please take a look into the SMART report above for drive health issues. --> RESULT: Preclear Finished Successfully!. Retrying now on internal backplane on my T310. Quote Link to comment
Vr2Io Posted March 13, 2021 Share Posted March 13, 2021 It shouldn't disk problem. The difference of rebuild vs preclear is most disk read in same time. Loading increase a lot. Quote Link to comment
craigr Posted March 14, 2021 Share Posted March 14, 2021 Run an extended (long) SMART test. I have had drives that pass preclrear but fail SMART. They are in a landfill. craigr Quote Link to comment
PeteAron Posted March 15, 2021 Share Posted March 15, 2021 OK so i have a similar problem - i have a disk that fails with crc errors in my array, but a preclear and an extended smart test are both passed with no problem. I dont understand how this can happen - is it possible my SATA cable is failing? Quote Link to comment
JorgeB Posted March 15, 2021 Share Posted March 15, 2021 33 minutes ago, kimifelipe said: i have a disk that fails with crc errors CRC errors are a connection problem, usually a bad SATA cable. Quote Link to comment
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