On Sun, Jan 3, 2021 at 3:34 PM Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote:
On Sun, Jan 3, 2021, 6:26 AM Richard Shaw <hobbes1069@xxxxxxxxx> 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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