The command umask 002 will accomplish the task of reconfiguring the server so that only file owners and group members can modify new files by default. The umask command is a tool for setting the default permissions for new files and directories on Linux systems. The umask value is a four-digit octal number that represents the permissions that are subtracted from the default permissions. The default permissions for files are 666, which means read and write for owner, group, and others. The default permissions for directories are 777, which means read, write, and execute for owner, group, and others. The umask value consists of four digits: the first digit is for special permissions, such as setuid, setgid, and sticky bit; the second digit is for the owner permissions; the third digit is for the group permissions; and the fourth digit is for the others permissions. The umask value can be calculated by subtracting the desired permissions from the default permissions. For example, if the desired permissions for files are 664, which means read and write for owner and group, and read for others, then the umask value is 002, which is 666 -
664. The command umask 002 will set the umask value to 002, which will ensure that only file owners and group members can modify new files by default. This is the correct command to use to accomplish the task.

The high %iowait value (50.38%) in the iostat output suggests that the CPU is waiting for I/O operations to complete, often caused by storage bottlenecks rather than a lack of CPU or memory resources.

du used to estimate file space usage
lvs command provides logical volume information in a configurable form, displaying one line per logical volume.
df will display the amount of available disk space for file systems on which the invoking user has appropriate read access.
fsck is a tool for checking the consistency of a file system in Unix and Unix-like operating systems.

-c 12 for number of pings sent, -i 300 for seconds to wait until next ping(interval)