Scuba_Steve Posted July 26 Share Posted July 26 Hello Everyone, I have a question is it possible to change my single 20TB parity drive to a 18TB drive for parity? My largest drive in my array is 18TB drive. Thank you Quote Link to comment
JonathanM Posted July 26 Share Posted July 26 Sure. Stop the array, unassign the 20TB, assign the 18, start the array and let it rebuild parity. You may need to start the array with the parity drive unassigned, then assign the 18TB, I can't remember. If you are paranoid about drive failure while parity is being rebuilt, you can do all this in maintenance mode so the drives don't mount and are unavailable for the duration. This would mean that the 20TB would remain valid until the array was started normally. Quote Link to comment
Scuba_Steve Posted July 26 Author Share Posted July 26 Thank you so much for the valuable information. It does make me worry if the rebuild is not successful. Quote Link to comment
JonathanM Posted July 26 Share Posted July 26 54 minutes ago, Scuba_Steve said: It does make me worry if the rebuild is not successful. Do you have a reason to suspect your drives? Unraid parity requires all drives to be successfully read in total, not just the occupied data space. If you have any suspect drives you need to take care of that before changing parity. When was your last parity check with zero errors? Quote Link to comment
Scuba_Steve Posted July 26 Author Share Posted July 26 I just recently lost a 18TB drive and I am in the process of going through Preclear currently. Quote Link to comment
JonathanM Posted July 26 Share Posted July 26 Before you swap the parity drive, run a non-correcting parity check to be sure everything is stable with all your current data drives. Quote Link to comment
Scuba_Steve Posted July 26 Author Share Posted July 26 I am definitely going to do a parity check. Thank you for your help Quote Link to comment
Scuba_Steve Posted July 27 Author Share Posted July 27 I am definitely going to do a parity check. Thank you for your help I am reading the different opinions about using Correcting vs Non Correcting parity checks. That is how I lost my HDD it was during a parity check and the disk went offline and I could not revive it Quote Link to comment
itimpi Posted July 27 Share Posted July 27 1 hour ago, Scuba_Steve said: I am definitely going to do a parity check. Thank you for your help I am reading the different opinions about using Correcting vs Non Correcting parity checks. That is how I lost my HDD it was during a parity check and the disk went offline and I could not revive it You should be doing a none-correcting check as the default. You normally only want to do a correcting check after something has happened that makes you think parity may no be co pletely in sync, and you have rectified any known hardware issues. Quote Link to comment
Scuba_Steve Posted July 29 Author Share Posted July 29 I am definitely going to do a parity check. Thank you for your help I am reading the different opinions about using Correcting vs Non Correcting parity checks. That is how I lost my HDD it was during a parity check and the disk went offline and I could not revive it My data rebuild is finding lots of errors. How can I fix it? Quote Link to comment
Scuba_Steve Posted August 10 Author Share Posted August 10 (edited) I swapped parity drives with a 18TB HDD and something does not seem right. Rebuild took less than an hour for an 18TB HDD. Then I proceeded to go back to my 20TB HDD and I am getting missing parity drive error. What is the proper procedure? Edited August 10 by Scuba_Steve Quote Link to comment
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