mkfs.btrfs -m raid1 just means 'meta data' works as raid1 You should try mkfs.btrfs -d raid1
This maybe help: mkfs.btrfs [-A <offset>] [-b <size>] [-l <size>] [-n <size>] [-l <label>] [-s <size>] [-m raid0|raid1|raid10|single] [-d raid0|raid1|raid10|single] <device> 2008/12/31 Shen Feng <s...@cn.fujitsu.com>: > > > on 12/30/2008 09:44 AM, Shen Feng wrote: >> Hi, >> >> I create a raid-1 btrfs with the following command. >> >> [r...@localhost ~]# fdisk -l /dev/sdb >> >> Disk /dev/sdb: 320.0 GB, 320072933376 bytes >> 255 heads, 63 sectors/track, 38913 cylinders >> Units = cylinders of 16065 * 512 = 8225280 bytes >> Disk identifier: 0xb44829ea >> >> Device Boot Start End Blocks Id System >> /dev/sdb1 1 4863 39062016 83 Linux >> /dev/sdb2 4864 9726 39062047+ 83 Linux >> /dev/sdb3 9727 38905 234375905+ f W95 Ext'd (LBA) >> /dev/sdb5 9727 14590 39063374 83 Linux >> /dev/sdb6 14590 19453 39068690+ 7 HPFS/NTFS >> /dev/sdb7 19454 29178 78116031 83 Linux >> /dev/sdb8 29179 31610 19535008+ 83 Linux >> /dev/sdb9 31611 34041 19526976 83 Linux >> /dev/sdb10 34042 36473 19535008+ 83 Linux >> /dev/sdb11 36474 38904 19526976 83 Linux >> >> [r...@localhost ~]# mkfs.btrfs -m raid1 /dev/sdb8 /dev/sdb9 /dev/sdb10 >> /dev/sdb11 >> adding device /dev/sdb9 id 2 >> adding device /dev/sdb10 id 3 >> adding device /dev/sdb11 id 4 >> fs created label (null) on /dev/sdb8 >> nodesize 4096 leafsize 4096 sectorsize 4096 size 74.50GB >> Btrfs v0.16-29-g0d53b21 >> >> [r...@localhost ~]# mount -t btrfs /dev/sdb8 /mnt/btrfs[r...@localhost ~]# df >> Filesystem 1K-blocks Used Available Use% Mounted on >> ... >> /dev/sdb8 78123968 28 78123940 1% /mnt/btrfs >> > > More test: > > [r...@localhost btrfs]# df -h /dev/sdb8 > Filesystem Size Used Avail Use% Mounted on > /dev/sdb8 75G 28K 75G 1% /mnt/btrfs > [r...@localhost btrfs]# dd if=/dev/zero of=/mnt/btrfs/file bs=1024 count=1024 > 1024+0 records in > 1024+0 records out > 1048576 bytes (1.0 MB) copied, 0.0481317 s, 21.8 MB/s > [r...@localhost btrfs]# sync > [r...@localhost btrfs]# df -h /dev/sdb8 > Filesystem Size Used Avail Use% Mounted on > /dev/sdb8 75G 1.1M 75G 1% /mnt/btrfs > > With raid-1, the used space may be double (about 2.2M), I think. > > > >> I think the partition size is no correct since this is a raid-1 partition. >> The size should be half. >> Is this a bug? >> >> -Shen >> -- >> 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 >> >> > > -- > Best Regards, > -------------------------------------------------- > Shen Feng > Development Dept.I > Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST) > 8/F., Civil Defense Building, No.189 Guangzhou Road, > Nanjing, 210029, China > PHONE: +86-25-86630566-950 > COINS: 79955-950 > FAX: +86-25-83317685 > MAIL: s...@cn.fujitsu.com > ------------------------------------------------- > This communication is for use by the intended recipient(s) only and may > contain information that is privileged, confidential and exempt from > disclosure under applicable law. If you are not an intended recipient of this > communication, you are hereby notified that any dissemination, distribution > or copying hereof is strictly prohibited. If you have received this > communication in error, please notify me by reply e-mail, permanently delete > this communication from your system, and destroy any hard copies you may have > printed. > -- > 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 > -- Thanks & Best Regards Liu Hui -- -- 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
