Migrating ZFS from 8.3 to 10.1

[Sami Halabi]

hi,
Its worth mentioning that in 10 ZFS allocates few% (?) of disk space as
reserved for fs uses that wasn't in 8/9, so if you have small ammount of
free space you might end up in an full system with no free space.

Sami
בתאריך 11 באפר׳ 2015 02:07,‏ "Steven Hartland" <killing at multiplay.co.uk>
כתב:

> We did moved from 8.3 -> 10.1 had to go via 10.0 as we did a in place
> source upgrade but had no issues.
>
> 10.x has block size validation which 8.3 so if your disks are 4k sectors
> and you didn't manually configure this on install you may end up with pools
> complaining about this, but that will just mean reduced performance
> (something you had already).
>
> Yes once your happy 10.1 is working fine you should upgrade your pools to
> get all the new features which are well worth having.
>
>     Regards
>     Steve
>
> On 10/04/2015 22:43, javocado wrote:
>
>> Hello,
>>
>> I am planning to migrate (upgrade) my system from FreeBSD 8.3 RELEASE to
>> 10.1 RELEASE (both amd64). My zfs pool exists on it's own physical
>> device(s) so my upgrade will consist of:
>>
>> 1. install FreeBSD 10.1 on boot device (in a temp system)
>> 2. remove 8.3 boot device (from production system)
>> 3. install new 10.1 boot device and boot up production system
>> 4. re-mount zfs FS
>>
>> My question is, what do I need to know about how this change will affect
>> or
>> impact the zpool and datasets? Is there any chance zfs data could be lost
>> or destroyed? Might there be a performance loss due to version
>> differences?
>> Is upgrading the zpool (once booted to 10.1) strongly advised? Any
>> downsides or dangers there?
>>
>> Some other info worth considering (production system):
>>
>> ZFS filesystem version 5
>> ZFS storage pool version 28
>>
>> Thanks!
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>
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