Hello,
I am probably missing something obvious, but I’m struggling to understand something. Previously, when backing up datasets, I thought that the “refer” column was consistent between source and target. I’m a bit confused that in tests I am running within the same pool, this is not the case:
I have a simple test dataset, rpool/test/source. I replicate this using a simple syncoid command:
syncoid rpool/test/source rpool/test/target2
But then the snapshot refer is different:
$ zfs list -t snapshot -r rpool/test
NAME USED AVAIL REFER MOUNTPOINT
rpool/test/source@firsttest 80K - 228K -
rpool/test/source@syncoid_work-XPS-9315-plucky_2025-06-15:10:15:03-GMT01:00 0B - 228K -
rpool/test/target2@firsttest 80K - 204K -
rpool/test/target2@syncoid_work-XPS-9315-plucky_2025-06-15:10:15:03-GMT01:00 48K - 204K -
As is the “written” value:
$ zfs list -o name,written -t snapshot -r rpool/test
NAME WRITTEN
rpool/test/source@firsttest 228K
rpool/test/source@syncoid_work-XPS-9315-plucky_2025-06-15:10:15:03-GMT01:00 80K
rpool/test/target2@firsttest 204K
rpool/test/target2@syncoid_work-XPS-9315-plucky_2025-06-15:10:15:03-GMT01:00 80K
The datasets/snapshots are in the same pool, so the ashift should be the same. The datasets have encryption, but this is the same on both:
$ zfs get encryption -r rpool/test
NAME PROPERTY VALUE SOURCE
rpool/test encryption aes-256-gcm -
rpool/test/source encryption aes-256-gcm -
rpool/test/source@firsttest encryption aes-256-gcm -
rpool/test/source@syncoid_work-XPS-9315-plucky_2025-06-15:10:15:03-GMT01:00 encryption aes-256-gcm -
rpool/test/target2 encryption aes-256-gcm -
rpool/test/target2@firsttest encryption aes-256-gcm -
rpool/test/target2@syncoid_work-XPS-9315-plucky_2025-06-15:10:15:03-GMT01:00 encryption aes-256-gcm -
The guids for the datasets/snapshots match:
$ zfs list -o name,guid,refer,written,encryption -t snapshot -r rpool/test
NAME GUID REFER WRITTEN ENCRYPTION
rpool/test/source@firsttest 11449625390916305729 228K 228K aes-256-gcm
rpool/test/source@syncoid_work-XPS-9315-plucky_2025-06-15:10:15:03-GMT01:00 3139788996491844858 228K 80K aes-256-gcm
rpool/test/target2@firsttest 11449625390916305729 204K 204K aes-256-gcm
rpool/test/target2@syncoid_work-XPS-9315-plucky_2025-06-15:10:15:03-GMT01:00 3139788996491844858 204K 80K aes-256-gcm
What am I misunderstanding? Thanks in advance!