I'm planning to set up a RAID1 configuration using mdadm with three different drives at varying speeds: an M.2 SSD with 14 GB/sec, a SATA SSD at 600 MB/sec, and a SATA HDD at 100 MB/sec. I'm concerned about potential hiccups since two of the drives are write-only. Will the differences in speed cause issues with performance, particularly with the -writeonly setup? Has anyone dealt with a similar configuration?
1 Answer
In this setup, you’ll be limited to the write speed of the slowest drive, which is the HDD at 100 MB/s. If you really want to try it, you can use the --write-behind option to help somewhat, but you'll need to enable --bitmap as well, which adds some overhead.
Thanks for the tip! Besides --write-behind, is there anything else I should consider? I already have the bitmap setup.