October 7, 201213 yr Can it be checked if a disk has been precleared? Does the preclear script leave a "signature" on the disk.
October 7, 201213 yr Can it be checked if a disk has been precleared? Does the preclear script leave a "signature" on the disk. preclear_disk.sh -t /dev/sdX -t tests the signature
October 7, 201213 yr Author Thanks Joe, If such a signature is detected, will it then be safe to add such a drive to an array with init config?
October 7, 201213 yr Why not just add the cleared drive to an available data drive slot? There is no need to rebuild parity. A cleared drive does not required any parity updates. The system will be unprotected if init config is used.
October 7, 201213 yr Thanks Joe, If such a signature is detected, will it then be safe to add such a drive to an array with init config? yes, but if you use init-config it will immediately invalidate parity. You can add it without initconfig (if pre-cleared signature exists) and be up and running in minutes.
October 9, 201213 yr Author What if such a disk is a left-over from a previous built and contains data?
October 9, 201213 yr What if such a disk is a left-over from a previous built and contains data? If it contains data, and was formatted by unRAID, it is is most definitely not precleared. If you use initconfig, it will be recognized as a data disk with data. It will not be cleared by unraid. If you wish the disk to be re-formatted by unRAID you must do something on it to make it not look like an unRAID disk. You can use preclear_disk.sh -z /dev/sdX to zero the MBR of the disk (write zeros to the first 512 bytes on the disk) It will only take a few seconds. It will force unRAID to partition and format the disk.
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