November 18, 20241 yr So a couple of days ago I noticed a drive in my ZFS pool was acting up. zpool status was showing 100-200 write and read errors shortly after trying to move some TV shows to a share that exists on this pool. I shutdown the server, removed the drive caddy from the hot-swappable drive bay, and reinstalled making sure that it was firmly pushed and locked back into the enclosure. After a couple hours I had the same issue with read/write errors in zpool status causing it to be kicked from the pool and the pool marked as degraded. There were a bunch of IO errors in the logs and the reported pending sector, CRC and offline uncorrectable jumped up to around 32. I was convinced this nearly 4 year old drive was failing so I ordered a replacement. I even recorded the swapping out process moving a new drive into the existing shelf location and putting the old drive in a different slot. After resilvering the new drive into the pool and ensuring everything was good I used pre clear to erase the drive and to my surprise the smart appeared to improve as per below: #################################################################################################### # Unraid Server Erase of disk WRD0BJMX # # Cycle 1 of 1. # # # # Step 1 of 1 - Erasing the disk: [11:23:47 @ 195 MB/s] SUCCESS # # # # # # # # # # # # # # # #################################################################################################### # Cycle elapsed time: 11:23:49 | Total elapsed time: 11:23:50 # #################################################################################################### #################################################################################################### # S.M.A.R.T. Status (device type: default) # # # # ATTRIBUTE INITIAL CYCLE 1 STATUS # # Reallocated_Sector_Ct 408 408 - # # Power_On_Hours 33941 33952 Up 11 # # Reported_Uncorrect 1444 1446 Up 2 # # Airflow_Temperature_Cel 15 24 Up 9 ->Failed in Past<- # # Current_Pending_Sector 32 0 Down 32 # # Offline_Uncorrectable 32 0 Down 32 # # UDMA_CRC_Error_Count 8 8 - # # # # # #################################################################################################### # Report genereated on: November 18, 2024 at 06:12:08 # #################################################################################################### --> ATTENTION: Please take a look into the SMART report above for drive health issues. --> RESULT: Erase Finished Successfully! The bit that I'm interested in is that these sector issues went down! which I've not seen before. # Current_Pending_Sector 32 0 Down 32 # # Offline_Uncorrectable 32 0 Down 32 I'm now running a 2 cycle preclear using pre and post reads but has anyone seen this before when a drive seems to bounce back into good health? Assuming the pre clear cycles pass without error I'm unsure if I should trust the drive again. What are your thoughts? Edited November 18, 20241 yr by WEC forgot a point
November 18, 20241 yr Community Expert It's normal for pending sectors to disappear after a full disk write, the question is if they will come back again soon, run a couple of SMART extended tests, and if they pass you can try giving it a 2nd chance.
November 19, 20241 yr Author Solution So after another preclear with no concerning values I'm considering adding the disk back into my next vdev expansion
January 2, 20251 yr Author Just to update this thread, the drive continued to flag issues and was replaced out of caution.
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.