January 20, 201313 yr I am assuming that you are pre-clearing the disk before adding it to the array? If so, then the answer is yes as the parity check only operates on the array disks and is thus independent of the pre-clear.
January 21, 201313 yr Can parity check be run while pre-clearing a disk? It can, but both processes are going to take a LOT longer.
January 21, 201313 yr Can parity check be run while pre-clearing a disk? It can, but both processes are going to take a LOT longer. They do not seem to affect each other on my system. I guess it depends if you are processor or I/O limited on your system so that one process is using resources needed by the other?
January 21, 201313 yr Author Have the simultaneous operations running now. Data array of 3 TB parity plus 13 data drives and pre-clearing one 2TB drive. As far as I can tell, parity sync and pre-clearing are running about as fast as expected so far. I have puny single core Celeron 420 @1.6G and 4G of RAM. top report taken while 14 disks involved in parity sync and one disk being pre-cleared is attached. Looks like cpu is maxed out and load average is twice what the cpu can process. Probably the little cpu always maxes out during parity sync. Also could be that reason I am not seeing any delta in parity speed is that I have eleven 6-8 year old 750G Seagate drives that are dinosaur-slow by today's standards. They keep parity build rate at about 15 MB/s until it gets past the 750 G step and moves to the higher capacity, later vintage, faster drives. The reason I just replaced the parity drive (3T replacing 2T) is that I am to point where I only have one drive slot vacant (only 15 drive trays). So I am going to install another couple of 3T data drives and start repurposing the older drives.
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