[developer] Migrating metadata to SSD vdevs when ZoF allocation classes lands

2020-07-02 Thread Stilez
I'm preparing ahead for when ZFS FreeBSD gains allocation classes with ZoF, and have 2 technical questions. 1) Will migrating a pool's metadata to SSD vdevs require send+recv the pool to a newly configured pool, or can it be done any way in situ? I'm fairly sure its the former but worth check

Re: [developer] Pathway to better DDT, and value-for-effort assessment of mitigations in the meantime.

2019-07-07 Thread Stilez
tables. -- richard On Jul 7, 2019, at 5:41 AM, Stilez wrote: "Dedup special class"? On 6 July 2019 16:24:27 Richard Elling wrote: On Jul 5, 2019, at 9:11 PM, Stilez wrote: I'm one of many end-users with highly dedupable pools held back by DDT and spacemap RW ineffici

Re: [developer] Pathway to better DDT, and value-for-effort assessment of mitigations in the meantime.

2019-07-07 Thread Stilez
"Dedup special class"? On 6 July 2019 16:24:27 Richard Elling wrote: On Jul 5, 2019, at 9:11 PM, Stilez wrote: I'm one of many end-users with highly dedupable pools held back by DDT and spacemap RW inefficiencies. There's been discussion and presentations - Matt Ah

[developer] Pathway to better DDT, and value-for-effort assessment of mitigations in the meantime.

2019-07-05 Thread Stilez
s (spacemap/DDT/other metadata?) be helpful here? Is it something worth fitting on the radar? Thank you for discussion and any support or stepping up! (Unfortunately I'm unable to do much more than raise this to the list - grossly inadequate starting point to cont