Re:In Praise of ZFS on Linux's ZED 'ZFS Event Daemon'
by accelbred on Monday July 20, 2020 @04:25PM
(#23901530)
If you're using RAID-Z on zfs, your comparison isn't fair. Rather than use RAID56 with btrfs, the equivalent would be to get 1 or 2 disk redundancy with raid1 or raid1c3.
Re:In Praise of ZFS on Linux's ZED 'ZFS Event Daemon'
by tw04 on Tuesday July 21, 2020 @10:16AM
(#23906935)
RAID-Z is the equivalent of RAID-5. RAID-Z2 is the equivalent of RAID-6. RAID-Z3 would be the equivalent of RAID-7 (or whatever the standard is named for 3-disk parity).
This is strictly speaking to how it deals with data and parity, the implementations are obviously different.
RAID-1 would be a mirror in ZFS parlance.
Re:In Praise of ZFS on Linux's ZED 'ZFS Event Daemon'
by accelbred on Thursday July 23, 2020 @02:26AM
(#23924706)
BTRFS raid1 isn't mirroring drives though, it means there are two copies of each extent across the whole set of 2+ drives. and BTRFS and raid1c3 and raid1c4 are 3 and 4 copies.
Re:In Praise of ZFS on Linux's ZED 'ZFS Event Daemon'
by trasz on Monday July 20, 2020 @08:19PM
(#23903226)
Not really - RAIDZ is basically RAID5 without the write hole problem. ZFS equivalent to RAID1 is called 'mirror', and is... well, a mirror.
Last I checked BTRFS RAID5/6 was a dumpster fire and unusable in production. Have they actually open sourced the ability to fix bitrot detection with mdraid? If not, it's kind of irrelevant.
So... once again down votes without response - BTRFS raid still isn't recommended and the file healing isn't compatible with MDRAID I assume and you just don't like the fact I pointed it out? The "I'm downvoting because you pointed out a flaw in my logic" @HN is disappointing.