LSASS – Directory Services could not start – 0xc000006a

The data=writeback mount option deserves to be tried, in order to prevent journaling of the file system. This should be done only during the deletion time, there is a risk however if the server is being shutdown or rebooted during the delete operation.

According to this page,

Some applications show very significant speed improvement when it is used. For example, speed improvements can be seen (...) when applications create and delete large volumes of small files.

The option is set either in fstab or during the mount operation, replacing data=ordered with data=writeback. The file system containing the files to be deleted has to be remounted.

launchctl(8) is your friend. Just keep in mind that some of the services (sshd for example) are disabled in the configuration file so you will need to use the -w switch when loading them. Here is a sshd example:

$ sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist 

You can stop the service using the unload subcommand.

$ sudo launchctl unload  /System/Library/LaunchDaemons/ssh.plist 

To list the services, as you might have already guessed use the 'list' subcommand ;)