3 ms·
btrfs doesn't support bad blocks. It's written in the documentation. From experience I can tell you that most usb sticks fail while reading back data by return
by M95D 3y ago
btrfs doesn't support bad blocks. It's written in the documentation.
From experience I can tell you that most usb sticks fail while reading back data by returning bad data, not an error or timeout, and the defective sectors aren't always the same (internal remap to wear leveling might be the cause of that).
Advice:
Do md-raid0 on half of them, md-raid0 on the other half, and btrfs raid1 on the two md devices.
If you want to exceed 25MB/s, use different USB controllers, not different ports on the same hub.
- o11c 3y agoBtrfs doesn't directly support bad blocks. But since the conversion is supposed to use only "free space" that's presumably excluding bad blocks (which are presumably counted as allocated).
- M95D 3y agoDoesn't support bad blocks at all. Bad blocks don't count as allocated unless they are newly discovered - data should be moved asap if it's still recoverable. An allocated block with nothing in it is an error.