Virtual disk operations like initialization or disk replacement on one virtual disk will not impact other virtual disks on the server. Virtual disk initialization will delete all data from the virtual disk where the task is performed.  Note : It is always a good practice to backup your data before carrying out any such tasks.
Hello! Sorry for asking but I never worked with RAID controllers. I have test server PE T310 which I user as a test environment. Suddenly thing came to the point when I started using this server as the main application one and the risk to lose data is not affordable. When I build this Server I created two arrays - 4 SSDs when in one array and two conventional small drives are in the second array. Now I would like to significantly increase the storage capacity and replace these two 180GB drives with two IronWolf 4TB drives putting them in the same mirror array. So my question is - can any operation with second array (initialization, disk replacing e.t.c...) affect the first array with important system and SQL data?   Thanks.  
PERC H710 array modification.