Your FreeNAS, or FreeBSD, ZFS zpool lost power and can’t be accessed.

Boot the machine and enter the boot loader menu and set these:

set vfs.zfs.debug=1
set vfs.zfs.recover=1
set debug.bootverbose=1

boot -s <enter> to start the machine in single user mode.

Once booted:

zpool import -fFX -o readonly=on -R /mnt tank (or whatever the name of your zpool is).

This should work in most all cases and allow you to rsync/scp/copy your data off of the zpool.

Don’t deviate from the above. I know you are super smart and believe you don’t need to set the flags, don’t need single user mode, or don’t need to mount in read only. You do. Don’t waste time and risk screwing up the pool permanently.

Note: The below is for vCenter 6.0. VMware has made it easier in 6.7. You just need to restart VAMI using:

/sbin/service vami-lighttp restart

You have updated the SSL certificate on your Platform Service Controller (PSC) and you probably went through a further nightmare of update the SSL certificates on a bunch of other services.

After all of the above was completed, you realized that none of this tediosity updated the VAMI SSL certificate on port 5480.

Login to the vCenter shell and run this command:

/usr/lib/applmgmt/support/scripts/postinstallscripts/lighttpd-vecs-integration.sh

It will update the SSL certificate used on the VAMI to the SSL certificate used on the PSC, vCenter webclient, etc: