Hi, Le 29/11/2016 à 18:20, Florian Lindner a écrit : > [...] > > * Any other advice? ;-) Don't rely on RAID too much... The degraded mode is unstable even for RAID10: you can corrupt data simply by writing to a degraded RAID10. I could reliably reproduce this on a 6 devices RAID10 BTRFS filesystem with a missing device. It affected even a 4.8.4 kernel where our PostgreSQL clusters got frequent write errors (on the fs itself but not the 5 working devices) and managed to corrupt their data. Have backups, you probably will need them. With Btrfs RAID If you have a failing device, replace it early (monitor the devices and don't wait for them to fail if you get transient errors or see worrying SMART values). If you have a failed device, don't actively use the filesystem in degraded mode. Replace or delete/add before writing to the filesystem again. Best regards, Lionel -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
