On Thursday 05 August 2010 16:15:22 Leonidas Spyropoulos wrote: > Hi all, > > I want to make a btrfs raid0 on 2 partitions of my pc. > Until now I am using the mdadm tools to make a software raid of the 2 > partitions /dev/sde2, /dev/sdd2 > and then mkfs.etx4 the newly created /dev/md0 device. > From performance point of view is it better to keep the configuration of > mdadm and just format the /dev/md0 device as btrfs OR > delete the raid device and format the 2 partitions /dev/sde2 /dev/sdd2 > as a btrfs with 2 devices? > mkfs.btrfs /dev/sde2 /dev/sdd2
Btrfs already supports metadata mirroring when the data is striped. What this means, is while the performance should be more-or-less identical to MD RAID0 (if it isn't it's a bug), your data is a bit more secure as the metadata describing it resides on both drives. Later on it will be possible to selct which directories/files should have what level of redundancy. This will allow to have ~/work RAID1-ed and ~/videos RAID0-ed while keeping both directories on the same partition and filesystem. > On a sidenote: > If I decide to go for raid5 which is not supported currently from mkfs > I have to use the mdadm tool anyway, right? yes, RAID5 code is not in trunk yet. -- Hubert Kario QBS - Quality Business Software 02-656 Warszawa, ul. Ksawerów 30/85 tel. +48 (22) 646-61-51, 646-74-24 www.qbs.com.pl -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
