Stefan Thüring

If the data sizes per disk are all less than the size of the parity disk, you're fine

thanks ! Would be nice if https://www.snapraid.it/manual had an example of a normal windows directory ;)

Hi, this is really a good idea :) My 2 parity disks are 5TB and have quite a few 2 and 3TB data disks. But I could imagine that this would complicate the source code quite a bit.

You could connect 5 data + 1 parity at a time to create 3 independant arrays.

You could connect 5 data + 1 parity at a time to create 3 independant arrays. Each parity will take about 1-3 days to build.

Have to correct my findings... Every day sync perf is limited to 80MB/s per disk on the 9+2 3TB array. Looks like the WD greens (WD30EZRX-00D) suck as parity disk when full (100% activity). The sync on the complete 3/4/5TB array still performs better (90-140MB/s per disk) using the 5TB Seagates (ST5000DM000-1FK1) as parity disks. a) So carefully select your parity disks (write performance)! Another interesting thing I found... I've often had random sync perf drops that I couldn't explain. Checking...

Have to correct my findings... Every day sync perf is limited to 80MB/s per disk on the 9+2 3TB array. Looks like the WD greens (WD30EZRX-00D) suck as parity disk when full (100% activity). The sync on the complete 3/4/5TB array still performs better (90-140MB/s per disk) using the 5TB Seagates (ST5000DM000-1FK1) as parity disks. a) So I guess carefully select your parity disks (write performance)! Another interesting thing I found... I've often had random sync perf drops that I couldn't explain....

I've now created a 9+2 3TB array. Current sync: 13%, 3488494 MB, 1301 MB/s, CPU 85%, 4:43 ETA Single disk perf can go up to 150MB/s, something that was impossible with 15 data disks. :) When this is finished/tested I'll create the other array and try a parallel sync.