Do I have to change the partition ID flag of each partition? Currently is set to fd (Linux Raid autodetect) for used from mdadm mkfs.btrfs supports that or needs to be 83 (Linux) ? On Thu, Aug 5, 2010 at 3:40 PM, Hubert Kario <hka@xxxxxxxxxx> wrote: > 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 > -- Caution: breathing may be hazardous to your health. -- 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
