On 6 August 2010 20:23, Leonidas Spyropoulos <artafi...@gmail.com> wrote: > 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) ?
FD is for mdraid integrated into the Linux kernel. I have mine at 83. It won't hurt to have them at FD, but the kernel will spend extra time as it probes the devices on boot, causing a slight slowdown. > > On Thu, Aug 5, 2010 at 3:40 PM, Hubert Kario <h...@qbs.com.pl> 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 majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Regards, Sebastian J. PS. Please try to bottom-post rather than top-post. Here's a link I can advise reading for a clarification on why bottom posting is essential: http://www.caliburn.nl/topposting.html -- 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
