Hi, i have some questions when using Btrfs on multi-devices:
1. a large file will always be stored wholely on a device or it may
spread on some devices/partitions? Btrfs has option to specify it
explicitly?
2. suppose i have a directory tree like that:
Dir_1
 |--> file_1A
 |--> file_1B
 |--> Dir_2
         |--> file_2C
         |--> file_2D

If Dir_2, file_2C  on a failed device, can i still have access to file_2D?
If i use GlusterFS (mirror mode) on two nodes, each nodes run Btrfs on
multi-device. When a device on a node fail and I replace it, then
GlusterFS resync it, can i have troubles with data consistency?

Thanks in advance!
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