Questions[filesystems](server)

I made a typo:

$ history
169 9:34    la /usr/local/etc/
170 9:35    sudo mkdir ^C
171 9:36    sudo mkdir /usr/local/etc/dnsmasq.d

Now I have a file that is called ^C (ctrl+C)!! When I use ls I just see a questionmark (probably due to the locale?)

% ls -al
total 60
drwxr-xr-x  2 root   wheel    512 Jan 21 09:35 ?        <- this one
drwxr-xr-x  5 admin  wheel    512 Jan 21 16:24 .
drwxr-xr-x  3 root   wheel    512 Jan 20 14:29 ..
-rw-r--r--  1 admin  nobody  1114 Jan 20 19:10 .cshrc
-rw-------  1 admin  wheel   6002 Jan 21 15:27 .history
-rw-r--r--  1 admin  nobody   182 Jan 20 14:29 .login
-rw-r--r--  1 admin  nobody    91 Jan 20 14:29 .login_conf
-rw-------  1 admin  nobody   301 Jan 20 14:29 .mail_aliases
-rw-r--r--  1 admin  nobody   271 Jan 20 19:04 .mailrc
-rw-r--r--  1 admin  nobody   726 Jan 20 19:05 .profile
-rw-------  1 admin  nobody   212 Jan 20 14:29 .rhosts
-rw-r--r--  1 admin  nobody   911 Jan 20 19:06 .shrc
drwx------  2 admin  nobody   512 Jan 20 15:05 .ssh
drwxr-xr-x  2 admin  wheel    512 Jan 20 19:08 bin

and

% ls -i
3611537 ?   3611534 bin

I want to remove this file. I try mv and when using tab-completion it shows me:

% mv
^C/  bin/

Obviously I can't type a ^C :-/ How do I remove this file?

I have recently started using LVM on some servers for hard drives larger than 1 TB. They're useful, expandable and quite easy to install. However, I could not find any data about the dangers and caveats of LVM.

What are the downsides of using LVM?

I have file servers which are used to store files. Files might reside there for a week, or for a year. Unfortunately, when I remove files from the server, df command doesn't reflect the freed up space. So eventually, the server gets filled up (df shows 99%), and my script doesn't send any more files there, except there might be a few dozen GB of free space on there.

I got noatime flag on the mounted partitions if that makes any difference.

Is there any standard or convention for where SSL certificates and associated private keys should go on the UNIX/Linux filesystem?

We're considering building a ~16TB storage server. At the moment, we're considering both ZFS and XFS as filesystem. What are the advantages, disadvantages? What do we have to look for? Is there a third, better option?