As @matheusmoreira mentioned - you can use harddisks of unequal size. I.e. three disks of 4+3+3 Tb in RAID1 will happily give you 5 Tb of usable space. AFAIK, no other filesystem can do that.
Quoting @matheusmoreira further:
> I can slowly buy drives of different capacities and add them to the file system one by one. I don't have to plan ahead of time like traditional RAID and ZFS setups. This is excellent for home data storage!
How? I don't see how it makes ZFS more flexible. Users still need to have every storage device installed on the computer before creating the RAID configuration. They can't start with the drives they already have and then add more drives over time. At least not without essentially recreating the array from scratch.
As @matheusmoreira mentioned - you can use harddisks of unequal size. I.e. three disks of 4+3+3 Tb in RAID1 will happily give you 5 Tb of usable space. AFAIK, no other filesystem can do that.
Quoting @matheusmoreira further:
> I can slowly buy drives of different capacities and add them to the file system one by one. I don't have to plan ahead of time like traditional RAID and ZFS setups. This is excellent for home data storage!