Impossible Posted April 28, 2018 Share Posted April 28, 2018 (edited) Hello! After some advice. I have been running unRAID for around 9 months now and have come around to upgrading two disks in the system. Disk 1 is a USB3 drive which contains a 6TB hard disk. I plan to shuck this drive after a successful pre-clear. Disk 2 is a SATA SSD which I plan to put in a two drive cache setup. This drive replaces a previous disk that utilised the same controller port / sata cable The Disk 1 (USB3 drive) has just failed a preclear at stage 5 which is Post-Read verification. Spooked me at first but that's why we preclear right! I ensured that the USB3 cable was away from any interference and have kicked it off again. Whilst this drive is attempting its second preclear I kicked off the same on Disk 2 (sata SSD) which also failed at the Post-Read verification. At this point I'm getting even more worried. I understand that there is a chance that both drives are unfit along with a chance that there is a system issue (eg RAM related) I'm planning on performing a memtest (which will take the array off line) but would appreciate any other suggestions. Thanks Edited May 4, 2018 by Impossible (SOLVED) Quote Link to comment
trurl Posted April 28, 2018 Share Posted April 28, 2018 There have definitely been cases where this was due to bad RAM, including me. Quote Link to comment
Impossible Posted April 29, 2018 Author Share Posted April 29, 2018 Attempted to run a memtest over night - The version I used seems to have a bug in the SMP module and froze after a short time. This meant I missed out on memtest'ing over night More details over at this Reddit post I decided to throw the disks in another machine and added a third as a test. One is still carrying out the preclear (the Disk 1 USB3 drive) but the other two in a different unRAID box both failed! Hmmmm Quote Link to comment
Mat1926 Posted April 29, 2018 Share Posted April 29, 2018 I never used the preclear plugin before and I don't know if you did set it up differently for the SSD, but I thought the preclear is meant for mechanical hard drives...am I wrong? or perhaps you are doing something entirely different.... Thnx Quote Link to comment
Frank1940 Posted April 29, 2018 Share Posted April 29, 2018 16 hours ago, Impossible said: Disk 2 is a SATA SSD which I plan to put in a two drive cache setup. 16 hours ago, Impossible said: I kicked off the same on Disk 2 (sata SSD) which also failed at the Post-Read verification. At this point I'm getting even more worried. 1 hour ago, Mat1926 said: I never used the preclear plugin before and I don't know if you did set it up differently for the SSD, but I thought the preclear is meant for mechanical hard drives...am I wrong? or perhaps you are doing something entirely different.... +1 See here: https://lime-technology.com/forums/topic/16695-preclear-ssd/ The failure modes of an SSD are radically different than for a spinning HD. Preclear is intended to test spinners--- not SSD's. The actual 'clearing' function of Preclear is now performed by unRAID in the background takes only a few minutes with the size of most SSD's. Quote Link to comment
gfjardim Posted April 29, 2018 Share Posted April 29, 2018 2 hours ago, Impossible said: Attempted to run a memtest over night - The version I used seems to have a bug in the SMP module and froze after a short time. This meant I missed out on memtest'ing over night More details over at this Reddit post I decided to throw the disks in another machine and added a third as a test. One is still carrying out the preclear (the Disk 1 USB3 drive) but the other two in a different unRAID box both failed! Hmmmm Currently there's a known bug in 0.9.5/6 preventing disks from being correctly cleaned. Will let you know when fixed. 1 Quote Link to comment
FraxTech Posted June 20, 2018 Share Posted June 20, 2018 On 4/29/2018 at 8:36 AM, gfjardim said: Currently there's a known bug in 0.9.5/6 preventing disks from being correctly cleaned. Will let you know when fixed. Hey, gfjardim, this is the second time I've seen you post something similar to this, and I keep getting Post-Read failures, no matter what drive I try to clear, so I'm wondering if this is still an issue and if there is an ETA on when we will see a fix? Quote Link to comment
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