On Sun, Jan 3, 2021 at 3:34 PM Chris Murphy <li...@colorremedies.com> wrote:
> > > On Sun, Jan 3, 2021, 6:26 AM Richard Shaw <hobbes1...@gmail.com> wrote: > >> Chris, >> >> Thanks for the detailed explanation. Too much to quote for my follow up >> question :) >> >> So for 3 drives and my desire to have more capacity and redundancy (for >> drive failure) would I be better off with RAID1 or RAID5 w/ btrfs? >> > > Depends on what you mean by better. :D In terms of survivability of your > data? You're better off with more independent copies/backups than you are > with any kind of raid. Raid improves availability, i.e. instead of 0% > working it has a degraded mode where it's mostly working, but will require > specific actions to make it healthy again, before it also becomes 0% > working. > Yeah, the RAID1 seems a lot easier with the caveat that the free space reporting is bogus, which may be important for a media drive. :) The RAID5 caveats don't scare me too much. > Would RAID1 still allow for any single drive failure? >> > > Yes. Same for raid10. > > >> I don't really need the faster IO RAID5 might provide. >> > > Striped parity raids perform well for sequential workloads. They're not > good for metadata heavy workloads. Btrfs alters this calculation because > metadata (the fs itself) can have a different profile than data. i.e. the > recommendation is to use raid1 metadata when using raid5 data; and raid1c3 > metadata when using raid6 data. > For a media drive (smallest file is a few MB ogg to 30GB movie) I don't think things will be very metadata heavy. Thanks, Richard
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