From mboxrd@z Thu Jan 1 00:00:00 1970 From: Goffredo Baroncelli Subject: Re: linux 2.6.34 raid1 btrfs weird mounting issue Date: Fri, 28 May 2010 21:06:18 +0200 Message-ID: <201005282106.19055.kreijack@libero.it> References: Reply-To: kreijack@libero.it Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Cc: linux-btrfs@vger.kernel.org To: gmack@innerfire.net Return-path: In-Reply-To: List-ID: 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) Key fingerprint = 4769 7E51 5293 D36C 814E C054 BF04 F161 3DC5 0512