I''m trying to create a raid1 (mirrored) raid using two 1 Tb disks.
The result is something twice as large as it should be fore mirrored raid.
Any ideas? Linux version 2.6.34
# mkfs.btrfs -d raid1 -m raid1 /dev/sdb1 /dev/sdc1 -L fhome
WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using
adding device /dev/sdc1 id 2
fs created label fhome on /dev/sdb1
nodesize 4096 leafsize 4096 sectorsize 4096 size 1.82TB
Btrfs Btrfs v0.19
# mount /dev/sdb1 /mnt/
# df -h /mnt/
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 1.9T 56K 1.9T 1% /mnt
# btrfs-show
failed to read /dev/sr0
Label: none uuid: a2aa44b8-3168-480a-a155-d510e05853e7
Total devices 1 FS bytes used 617.45MB
devid 1 size 29.33GB used 6.79GB path /dev/sda2
Label: fhome uuid: 128ddab5-224d-4f45-abc0-6a07d0f63d47
Total devices 2 FS bytes used 28.00KB
devid 2 size 931.51GB used 2.01GB path /dev/sdc1
devid 1 size 931.51GB used 2.03GB path /dev/sdb1
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Gerhard Mack
gmack@innerfire.net
<>< As a computer I find your faith in technology amusing.
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Hi, > I''m trying to create a raid1 (mirrored) raid using two 1 Tb > disks. The result is something twice as large as it should be > fore mirrored raid. https://btrfs.wiki.kernel.org/index.php/FAQ#Why_does_df_show_incorrect_free_space_for_my_RAID_volume.3F -- Chris Ball <cjb@laptop.org> One Laptop Per Child -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, May 27, 2010 at 03:43:05PM -0400, gmack@innerfire.net wrote:> I''m trying to create a raid1 (mirrored) raid using two 1 Tb disks. > The result is something twice as large as it should be fore mirrored raid. > > Any ideas? Linux version 2.6.34 > > # mkfs.btrfs -d raid1 -m raid1 /dev/sdb1 /dev/sdc1 -L fhome > > WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL > WARNING! - see http://btrfs.wiki.kernel.org before using > > adding device /dev/sdc1 id 2 > fs created label fhome on /dev/sdb1 > nodesize 4096 leafsize 4096 sectorsize 4096 size 1.82TB > Btrfs Btrfs v0.19 > > # mount /dev/sdb1 /mnt/ > # df -h /mnt/ > Filesystem Size Used Avail Use% Mounted on > /dev/sdb1 1.9T 56K 1.9T 1% /mnt > > # btrfs-show > failed to read /dev/sr0 > Label: none uuid: a2aa44b8-3168-480a-a155-d510e05853e7 > Total devices 1 FS bytes used 617.45MB > devid 1 size 29.33GB used 6.79GB path /dev/sda2 > > Label: fhome uuid: 128ddab5-224d-4f45-abc0-6a07d0f63d47 > Total devices 2 FS bytes used 28.00KB > devid 2 size 931.51GB used 2.01GB path /dev/sdc1 > devid 1 size 931.51GB used 2.03GB path /dev/sdb1 >Used will show up as twice the amount that is actually used, instead of looking like you only have 1/2 the capacity. Thanks, Josef -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
I had my raid set to mount by uuid but that randomly doesn''t work so I
changed to mounting by the first partition in the raid.. that worked but
on the next reboot it failed. Changing the mount to the second partition
worked until the next reboot when I needed it to change it back to the
first. Each change seems to last for one reboot.
# mount /dev/sdb1 /home
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
# mount /dev/sdb1 /home
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
mount /dev/sdc1 /home
(worked)
# btrfs-show
failed to read /dev/sr0
Label: none uuid: a2aa44b8-3168-480a-a155-d510e05853e7
Total devices 1 FS bytes used 5.46GB
devid 1 size 29.33GB used 13.29GB path /dev/sda2
Label: fhome uuid: 128ddab5-224d-4f45-abc0-6a07d0f63d47
Total devices 2 FS bytes used 8.24GB
devid 1 size 931.51GB used 21.03GB path /dev/sdb1
devid 2 size 931.51GB used 21.01GB path /dev/sdc1
Gerhard
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Gerhard Mack
gmack@innerfire.net
<>< As a computer I find your faith in technology amusing.
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Sebastian ''gonX'' Jensen
2010-May-28 18:52 UTC
Re: linux 2.6.34 raid1 btrfs weird mounting issue
On 28 May 2010 20:45, <gmack@innerfire.net> wrote:> I had my raid set to mount by uuid but that randomly doesn''t work so I > changed to mounting by the first partition in the raid.. that worked but > on the next reboot it failed. Changing the mount to the second partition > worked until the next reboot when I needed it to change it back to the > first. Each change seems to last for one reboot. > > > # mount /dev/sdb1 /home > mount: wrong fs type, bad option, bad superblock on /dev/sdb1, > missing codepage or helper program, or other error > In some cases useful info is found in syslog - try > dmesg | tail or so > > # mount /dev/sdb1 /home > mount: wrong fs type, bad option, bad superblock on /dev/sdb1, > missing codepage or helper program, or other error > In some cases useful info is found in syslog - try > dmesg | tail or so > > mount /dev/sdc1 /home > (worked) > # btrfs-show > failed to read /dev/sr0 > Label: none uuid: a2aa44b8-3168-480a-a155-d510e05853e7 > Total devices 1 FS bytes used 5.46GB > devid 1 size 29.33GB used 13.29GB path /dev/sda2 > > Label: fhome uuid: 128ddab5-224d-4f45-abc0-6a07d0f63d47 > Total devices 2 FS bytes used 8.24GB > devid 1 size 931.51GB used 21.03GB path /dev/sdb1 > devid 2 size 931.51GB used 21.01GB path /dev/sdc1 > > > Gerhard > > > -- > Gerhard Mack > > gmack@innerfire.net > > <>< As a computer I find your faith in technology amusing. > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >Did you check output from dmesg? -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Goffredo Baroncelli
2010-May-28 19:06 UTC
Re: linux 2.6.34 raid1 btrfs weird mounting issue
Hi Gerhard On Friday, May 28, 2010, gmack@innerfire.net wrote:> I had my raid set to mount by uuid but that randomly doesn''t work so I > changed to mounting by the first partition in the raid.. that worked but > on the next reboot it failed. Changing the mount to the second partition > worked until the next reboot when I needed it to change it back to the > first. Each change seems to last for one reboot.Do you perform a "scan" before mounting the first time (after a reboot) a multivolume btrfs filesystem ? On the basis of your report it seems no. Btrfs requires to know where the components of a multi-volume filesystem are. To do that, you have to "scan" the devices, explicitly # btrfs scan /dev/sdX1 /dev/sdx2 ... or implicitly # btrfs scan In the last case the btrfs command scans every block device (even the cdrom and/or floppy). For other information you may want to read this thread which suggests how udev can perform the scan. http://kerneltrap.org/mailarchive/linux-btrfs/2010/4/16/6884594 Regards> > > # mount /dev/sdb1 /home > mount: wrong fs type, bad option, bad superblock on /dev/sdb1, > missing codepage or helper program, or other error > In some cases useful info is found in syslog - try > dmesg | tail or so > > # mount /dev/sdb1 /home > mount: wrong fs type, bad option, bad superblock on /dev/sdb1, > missing codepage or helper program, or other error > In some cases useful info is found in syslog - try > dmesg | tail or so > > mount /dev/sdc1 /home > (worked) > # btrfs-show > failed to read /dev/sr0 > Label: none uuid: a2aa44b8-3168-480a-a155-d510e05853e7 > Total devices 1 FS bytes used 5.46GB > devid 1 size 29.33GB used 13.29GB path /dev/sda2 > > Label: fhome uuid: 128ddab5-224d-4f45-abc0-6a07d0f63d47 > Total devices 2 FS bytes used 8.24GB > devid 1 size 931.51GB used 21.03GB path /dev/sdb1 > devid 2 size 931.51GB used 21.01GB path /dev/sdc1 > > > Gerhard > > > -- > Gerhard Mack > > gmack@innerfire.net > > <>< As a computer I find your faith in technology amusing. > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >-- gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo) <kreijackATinwind.it> Key fingerprint = 4769 7E51 5293 D36C 814E C054 BF04 F161 3DC5 0512 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html