Date: Mon, 8 Apr 2019 10:26:26 -0400 From: Mike Tancsa <mike@sentex.net> To: CyberLeo Kitsana <cyberleo@cyberleo.net>, freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: mounting from zfs:zroot/ROOT/default failed with error 45 Message-ID: <d2596939-69cc-cd88-4a60-7612cd33dd4d@sentex.net> In-Reply-To: <724a9bc6-4dd1-f383-b1c7-8cfb564c1bfd@cyberleo.net> References: <98a58bad-56ea-c598-2944-e4c70c2841a3@sentex.net> <a9983106-c8c3-5d4d-f1c0-b90bff86d950@sentex.net> <d04de27b-ef00-1ec8-7c1f-534400a4e453@sentex.net> <724a9bc6-4dd1-f383-b1c7-8cfb564c1bfd@cyberleo.net>
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On 4/8/2019 6:21 AM, CyberLeo Kitsana wrote: > >>> Actually, I wonder if the issue is that I am doing the zpool create on a >>> RELENG_12 box.... So when I try and boot that zpool that was freshly >>> created on RELENG_12 with a RELENG_10 kernel, I am running into issues. >> It does seem to be a zfs version issue which kinda makes sense. If I >> create the zfs image on a RELENG10 vm it works. The only issue is that >> its quite slow to do on the VM as its a LOT of disk IO. Is there a way >> to create an older version of a zfs file system on a newer version of >> FreeBSD so I can get the best of both worlds ? > Yes. Take a look at the differences in the feature flags available on 10 > and 12, and, during pool creation, explicitly set disabled the ones that > are not present on 10. > > I don't have any 10 nor 12 boxen available to me, but the one I recently > upgraded from 10 to 11 shows the following feature flags were added (and > never enabled on my pool): > > sha512 > skein > device_removal > obsolete_counts > zpool_checkpoint > > 12 may add more. > Thanks for the hints! Looking at a pool created on 12 vs the version I am trying to work with from 10, in terms of features referenced, feature@large_dnode does not exist and a bunch that do are turned off. diff old new 13,18c13,19 < feature@sha512 disabled local < feature@skein disabled local < feature@device_removal disabled local < feature@obsolete_counts disabled local < feature@zpool_checkpoint disabled local < feature@spacemap_v2 disabled local --- > feature@large_dnode enabled local > feature@sha512 enabled local > feature@skein enabled local > feature@device_removal enabled local > feature@obsolete_counts enabled local > feature@zpool_checkpoint enabled local > feature@spacemap_v2 active local However, there doesnt seem to be a way to create the pool with features disabled. The man page seems to imply that as well, at least on FreeBSD ? And trying to set it implies that as well. 0(nfs2)# zpool create -f -o altroot=/mnt2 -O "canmount=off" -o 'feature@spacemap_v2=disabled' -m none zroottest /dev/md0p3 cannot create 'zroottest': property 'feature@spacemap_v2' can only be set to 'enabled' 1(nfs2)# ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 x203 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada
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