Re: Set ZFS pool ashift=14 for FreeBSD root pools?

vermaden <[email protected]> Tue, 12 May 2026 23:13:21 +0200
Newsgroups	gmane.os.freebsd.devel.hackers
Message-ID	<ygfvctgwpzawkqfyoxmi@tbis>
> How can I do this at install time for all root pools?
> 
> Lionel

... or You can also specify '-o ashift=14' in the 'ZFS Pool Options' options section.

┌──────────────────────────┤ZFS Configuration├─────────────────────────┐
│ Configure Options:                                                   │  
│ ┌──────────────────────────────────────────────────────────────────┐ │  
│ │  >>> Install         Proceed with Installation                   │ │  
│ │  T Pool Type/Disks:  stripe: 0 disks                             │ │  
│ │  - Rescan Devices    *                                           │ │  
│ │  - Disk Info         *                                           │ │  
│ │  N Pool Name         zroot                                       │ │  
│ │  4 Force 4K Sectors? YES                                         │ │  
│ │  E Encrypt Disks?    NO                                          │ │  
│ │  P Partition Scheme  GPT (BIOS+UEFI)                             │ │  
│ │  S Swap Size         2g                                          │ │  
│ │  M Mirror Swap?      NO                                          │ │  
│ │  W Encrypt Swap?     NO                                          │ │  
│ │  O ZFS Pool Options  -O compression=on -O atime=off -o ashift=14 │ │  
│ └──────────────────────────────────────────────────────────────────┘ │  
├──────────────────────────────────────────────────────────────────────┤  
│                         [Select]     [Cancel]                        │  
└──────────── Use alnum, arrows, punctuation, TAB or ENTER ────────────┘ 

... or first use [LiveCD] option - then set ashift to 14 with sysctl(8) and then start bsdinstall(8) from command line.

Regards,
vermaden