ADV
Availability
% Actual
ADV2
Availability
% Actual
ADV3
Availability
% Actual
ADV4
Availability
% Actual
Availability shows the percentage of scheduled leader slots where the pool attempted to forge blocks. Actual shows the percentage of blocks adopted on chain against expected leader slots. Both metrics are calculated across the previous 20 epochs.
We track a large number of metrics to ensure that the ADAvault pools are reliably forging blocks including:
- expected number of leader slots based on pool stake,
- scheduled leader slots,
- blocks forged and adopted on chain.
Cardano uses a Verifiably Random Function (VRF) to schedule the leader slots. This averages over time to 100% of the expected slots, but there can be significant short term variance, particularly when pools are smaller.
ADV
The graph shows expected leader slots, scheduled leader slots, and blocks adopted on the blockchain. We show tabular data below for the last 20 epochs.
| Epoch | Expected | Scheduled | Adopted | MGSI* |
* M=Missed, G=Ghosted, S=Stolen, I=Invalid (please see below for more details)
ADV2
ADV, ADV2 and ADV3 have similar performance profiles, ghosted and stolen blocks become more likely as a pool gets closer to 100% saturation.
| Epoch | Expected | Scheduled | Adopted | MGSI |
ADV3
| Epoch | Expected | Scheduled | Adopted | MGSI |
ADV4
Scheduled leader slots for ADV4 have higher variance while the pool is smaller. There are also less stolen and ghosted blocks as the potential for VRF collisions is reduced. This can result in higher performance.
| Epoch | Expected | Scheduled | Adopted | MGSI |
Expected: The expected number of leader slots based on active stake for the pool
Scheduled: The number of leader slots scheduled by the VRF for the epoch
Adopted: The number of blocks forged by the pool and adopted on-chain
Missed (M): A leader slot was scheduled but there is no record of the pool attempting to forge and no other pool has made a block for this slot, possibly due to downtime or network issues.
Ghosted (G): A block was created but marked as orphaned and no other pool has made a valid block for this slot, possibly due to height battle or block propagation issue
Stolen (S): Another pool has a valid block registered on-chain for the same slot, likely due to VRF contention and more than one pool assigned to the slot
Invalid (I): The pool attempted but failed to forge a block for unknown reasons
There are stolen and ghosted blocks in some Epochs where an assigned block was minted by another pool. This is expected behaviour for the Ouroboros protocol with the tie-break decision based on the pool VRF key.
There will be some delay to performance data compared to the statistics for block production.