Switching mailserver with lots of active users isn't an easy task. First you need to copy the mails to the new server and then get all the users to change mailserver settings at the same time to switch to the new server.
Cristian Livadaru
Change SSH client settings to enable SSH logins to older SSH servers or Mikrotik routers
Cristian Livadaru
Adding new disks to a LSI controller, creating a new VD and extending an existing LVM volume group
Cristian Livadaru
Having to move ~ 180 Mail accounts from an older IMAP server to Zimbra (open source version) I though I would document the process if anyone else finds themself in this situation.
Cristian Livadaru
If you change all disks at once there will be issues booting the system and mounting the correct disks, here's how I solved this issue.
Cristian Livadaru