How to increase the space of my disk / dev / vda1 that is 100%

Hello, good morning, I have a 25GB space droplet, I have a Vesta CP server, my disk space / dev / vda1 is 99% because the mail server contains a lot of space, I just bought a 50GB volume and I followed the instructions to mount it in / dev / sda, and it has actually been mounted but I have a problem, the disk / dev / vda1 is full and my mail server shuts down, I would like to know how I can mount the 50GB in / dev / vda1 or how could I do so that the data of my mail server goes to / dev / sda. Greetings.

Filesystem Size Used Avail Use% Mounted on

/dev/vda1 25G 24G 473M 99% / /dev/sda 50G 52M 47G 1% /mnt/volumen_syrsac

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You’ll need to symlink your email folder to /mnt/volumen_syrsac. Here’s how

1. Locate the folder you want to move to /mnt/volumen_syrsac (ex: /var/spool/exim)

2. Shutdown your mail server (ex: service exim stop)

3. mv /var/spool/exim /mnt/volumen_syrsac/

4. ln -s /mnt/volumen_syrsac/exim /var/spool/exim

5. service exim start