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Rev

Huh, so you are saying, if one tries to set up a btrfs raid1 with three disks, it actually ignores your instruction and make a raid0 for you? (This sounds like a bug to me.)

Tom Yan
– Tom Yan

2023-01-30 00:51:42 +00:00
Commented Jan 30, 2023 at 0:51
@elbarna apparently btrfs raid 1 is something like "mirror on any two": btrfs.wiki.kernel.org/index.php/…

Tom Yan
– Tom Yan

2023-01-30 08:23:27 +00:00
Commented Jan 30, 2023 at 8:23
@Tom Yan unfortunately yes , i was expecting full copies of all files on all 3 hard disk but it didnt . when i remove 1 hard disk and mounted 1 hard disk in degraded option , it had 3 big 600 mb iso files only 1 file was in good condition , other 2 iso files gave me read error when i tried to create checksum of them

Amit Ranaware
– Amit Ranaware

2023-01-30 21:21:48 +00:00
Commented Jan 30, 2023 at 21:21
1

This is not correct. Even in raid1 with 3 devices you still have 2 copies of each data block, thus you can remove one drive and have 100% of data. With raid1c3 you have 3 copies of each data block and thus you can remove two drives (raid1c4 => 4 copies => 3 drives). Have a look at the official documentation btrfs.readthedocs.io/en/latest/mkfs.btrfs.html#profile-layout

Jiří Pospíšil
– Jiří Pospíšil

2024-03-28 21:15:10 +00:00
Commented Mar 28, 2024 at 21:15

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