Re: [lustre-discuss] ZFS and OST Space Difference

I think you are correct. ‘zpool list’ shows raw space, ‘zfs list’ shows the space after reservation for parity, etc.. In a 10 disk raidz2 ~24% of the space is reserved for parity. This website helps in calculating ZFS capacity. https://wintelguy.com/zfs-calc.pl

Re: [lustre-discuss] ZFS and OST Space Difference

> I am not sure about the discrepancy of 3T. Maybe that is due to some ZFS > and/or Lustre overhead? Slop space? https://openzfs.github.io/openzfs-docs/Performance%20and%20Tuning/Module%20Parameters.html#spa-slop-shift -Laura Od: lustre-discuss v imenu M

[lustre-discuss] ZFS and OST Space Difference

I believe this was discussed a while ago, but I was unable to find clear answers, so I’ll re-ask in hopefully a slightly different way. On an OST, I have 30 drives, each at 7.6TB. I create 3 raidz2 zpools of 10 devices (ashift=12): [root@lustre47b ~]# zpool list NAMESIZE ALLOC FR