August 19, 201411 yr I am currently setting up a new unRAID NAS to replace my ReadyNAS NV+ V2. I have 8TB of data to move over. I have 4 x 4TB WD Reds in the unRAID preclearing for data and parity. I have a couple of 1.5TB WD Greens, a Seagate 1TB 7200.12 and a Toshiba MQ01ACF050 500GB laptop drive scavenged from my Lenovo laptop. Obviously, moving this data will take a while, and doing tests with the other drives nets me around 20-40MB/s copy speed. With the Toshiba laptop drive as a cache drive, I get 100-110MB/s write. If I set the mover to run every two hours or one hour to copy to the parity protected drives, if the writes to the parity and data drives are slow, what happens with the copy? Will it error out? Or will the parity copies be ok? For instance, let's say 300GB have been copied over so far, with the other 7+ TB in the pipeline and the mover is going to start. Will it start copying that 300GB immediately, and then delete files from the cache drive once they are immediately copied over, or wait until the entire 300GB is copied over, then nuke it? I suppose I could copy <500GB over before I go to work, and then start another copy when I get home. But that'd take over a week of doing so. Any insight on this?
August 19, 201411 yr Do not write to the cache when doing the initial load. It is faster to write directly to the protected array than to copy to cache and then have it move the data to the protected array.
August 19, 201411 yr is it still quicker to not install the parity for initial load and add that later? This might help. Do a checksum or use teracopy (if windows) to confirm accurate copy
August 19, 201411 yr Author is it still quicker to not install the parity for initial load and add that later? This might help. Do a checksum or use teracopy (if windows) to confirm accurate copy Good call. I didn't even think of that. I'll do the move over with the parity drive though. Seems like the right thing to do, even if it will take a little longer.
August 19, 201411 yr Agreed. It is a good way to burn in the server. After copying all that data with parity enabled you will have confidence in the system.
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