Is sequential rebuild (device_rebuild) enabled by default?

[archagon]

@winnielinnie

If you want to leverage the speed of using -s, then it appears your only option is to do it all manually with the command-line, including partitioning the drive(s) with a 2 GiB swap space (“p1”) + remaining capacity for zfs_member (“p2”).

Only tangentially related to the topic, but do you know if TrueNAS still does this custom partitioning? Looking at my partition map through lsblk, I only see extra partitions on my boot drive, not my data drives:

NAME        FSTYPE     FSVER LABEL             UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
sda                                                                                                
└─sda1      zfs_member 5000  Smol              13769124202084177828                                
sdb                                                                                                
├─sdb1                                                                                             
├─sdb2      vfat       FAT32 EFI               C282-D0F0                                           
└─sdb3      zfs_member 5000  boot-pool         2507208359843399910                                 
sdc         zfs_member 5000  XL                13795326135035765220
sde                                                                                                
└─sde1      zfs_member 5000  XL                13795326135035765220                                
nvme1n1                                                                                            
└─nvme1n1p1 zfs_member 5000  PoolyPoolersonSSD 6959374796867253056                                 
nvme0n1                                                                                            
└─nvme0n1p1 zfs_member 5000  SSD               1240229572386050698    

I’m just trying to figure out if using zpool replace -s from the command line requires some additional steps for TrueNAS consistency when the drive is a non-boot drive.

(CC @phongn who mentioned “voodoo for partitioning under the hood.”)

EDIT: This user says that the 2GB swap partition is no longer created on initial setup? Need to hunt down the update where this is referenced: https://forums.truenas.com/t/how-to-create-a-swap-partiton/

EDIT2: Looks like maybe the 2GB swap partition was removed in 24.04.1: [Accepted] Create 2 GiB buffer space when adding a disk

EDIT3: “Remove creation/reporting/management of swap on TrueNAS (NAS-12887).”