Used space up to 100% single zvol in the pool

Hey everyone,
it seems like I'm having some troubles which I can't sort out myself.

Hardware:

• Truenas Mini X+
• 5x 6TB in RAID-Z2
• Single VDEV with all 5 drives

Setup:

• single pool with this one VDEV
• one ZVOL used as iSCSI to a Windows server
• snapshots enabled

When I logged in to increase the size of the ZVOL (currently 6TB) to 7TB I was presented with 99% usage of the pool. This pool has only this one ZVOL and nothing else. There were few hundred snapshots...

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