I've been having issues trying to preclear multiple drives at once. Couple nights ago, I managed to successfully preclear 12 drives with 1 cycle.
Once that finished, I started another 11 drives. During the Post read phase, one drive timed out and the raid controller failed it. PreClear also failed the rest of the drives due to the one drive timing out. I'm still not sure if preclear caused it or the raid controller. But the drive appears fine.
So in order to complete the cycle on all the drives that stopped/failed. I used the verify option thinking, it was going to do a pre-read and post read. But after the pre read phase, it started zero'ing the drives again, which is not what I wanted.
This plugin is not stable enough for me to clear a bunch of drives at once.
An enhancement request I have, is to be able to select multiple drives at once to pre-clear. It takes me close to 10mins to click through 24 drives to select the options and start the pre-clear. Not to mention the massive gui slowdown/stall the more drives you pre-clear at once.