Re: btrfs problems

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On 2018-09-20 05:35 PM, Adrian Bastholm wrote:
> Thanks a lot for the detailed explanation.
> Aabout "stable hardware/no lying hardware". I'm not running any raid
> hardware, was planning on just software raid. three drives glued
> together with "mkfs.btrfs -d raid5 /dev/sdb /dev/sdc /dev/sdd". Would
> this be a safer bet, or would You recommend running the sausage method
> instead, with "-d single" for safety ? I'm guessing that if one of the
> drives dies the data is completely lost
> Another variant I was considering is running a raid1 mirror on two of
> the drives and maybe a subvolume on the third, for less important
> stuff

In case you were not aware, it's perfectly acceptable with BTRFS to use
Raid 1 over 3 devices.  Even more amazing, regardless of how many
devices you start with, 2, 3, 4, whatever, you can add a single drive to
the array to increase capacity,  (at 50%, of course,, ie, adding a 4TB
drive will give you 2TB usable space, assuming the other drives add up
to at least 4TB to match it.)


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