2011-11-17 17:09:25 +0000, Stephane CHAZELAS: [...] > Before setting up a new RAID10 btrfs array with 6 drives, I > wanted to check how good it behaved in case of disk failure. > I've not been too impressed. Is RAID10 btrfs support only > meant for reading performance improvement? > > My test method was: > > Use the device-mapper to have devices mapped (linear) to loop > devices [...] > Then write some data, and then use DM's error target to simulate > a failing drive (all I/O ends up in error): > > # dmsetup suspend hd3; echo 0 $s error | dmsetup reload hd3; dmsetup resume hd3 [...] Note that I did the same test with both md (raid10) and zfsonlinux (raidz) and it worked as expected. -- Stephane -- 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
