Date: Wed, 20 Feb 2019 22:26:02 +0200 From: Christos Chatzaras <chris@cretaforce.gr> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Duplicating file system Message-ID: <4CAB4BC4-0473-41CF-AF03-D1CE796F5545@cretaforce.gr> In-Reply-To: <32153EA7-4BC5-4EE2-98FA-5BDEE1903BA3@cretaforce.gr> References: <0A33E3BE-96C9-4D83-B9F7-D4D2792B5161@kreme.com> <32153EA7-4BC5-4EE2-98FA-5BDEE1903BA3@cretaforce.gr>
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> On 20 Feb 2019, at 22:13, Christos Chatzaras <chris@cretaforce.gr> = wrote: >=20 >=20 >=20 >> On 20 Feb 2019, at 21:52, Cerebus <kreme@kreme.com> wrote: >>=20 >> I have an 11.2 system with two identical SSD drives. Currently I am = using rsnapshot to keep backups of the primary drive on the secondary = drive, but I am interested in having the second drive have a duplicate = copy of the entire file system in a bootable form, updated as the root = drive is modified. >>=20 >> How would I do this? >>=20 >> I don=E2=80=99t really want a RAID0 because I want to also keep the = periodic backups from rsnapshot as the drives are about 10x larger than = my data. >>=20 >> --=20 >> This is my signature. There are many like it, but this one is mine. >=20 > If both disks have the same size the easiest but not fastest way is to = use dd: >=20 > dd if=3D/dev/ada0 of=3D/dev/ada1 bs=3D64k I read again your message and I see that you want to keep the snapshots = in 2nd drive, so instead of using dd you can: 1) Use gpart/newfs to create new partitions/filesystems (smaller than = the 1st disk to have an extra partition for the snapshots) 2) Use dump to make a backup of the filesystems 3) Use restore to restore the data to 2nd disk 4) Use these commands to make the 2nd disk bootable: dd if=3D/dev/ada0 of=3D/dev/ada1 bs=3D512 count=3D40 gpart recover ada1 Then try to change the boot order for the disks from BIOS to see if = everything works as expected.=
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