failed disk (was: kernel 3.3.4 damages filesystem (?))
Hallo, Hugo, Du meintest am 07.05.12: mkfs.btrfs -m raid1 -d single should give you that. What's the difference to mkfs.btrfs -m raid1 -d raid0 - RAID-0 stripes each piece of data across all the disks. - single puts data on one disk at a time. [...] In fact, this is probably a good argument for having the option to put back the old allocator algorithm, which would have ensured that the first disk would fill up completely first before it touched the next one... The actual version seems to oscillate from disk to disk: Copying about 160 GiByte shows Label: none uuid: fd0596c6-d819-42cd-bb4a-420c38d2a60b Total devices 2 FS bytes used 155.64GB devid2 size 136.73GB used 114.00GB path /dev/sdl1 devid1 size 68.37GB used 45.04GB path /dev/sdk1 Btrfs Btrfs v0.19 Watching the amount showed that both disks are filled nearly simultaneously. That would be more difficult to restore ... Viele Gruesse! Helmut -- 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
failed disk (was: kernel 3.3.4 damages filesystem (?))
Hallo, Hugo, Du meintest am 07.05.12: [...] With a file system like ext2/3/4 I can work with several directories which are mounted together, but (as said before) one broken disk doesn't disturb the others. mkfs.btrfs -m raid1 -d single should give you that. Just a small bug, perhaps: created a system with mkfs.btrfs -m raid1 -d single /dev/sdl1 mount /dev/sdl1 /mnt/Scsi btrfs device add /dev/sdk1 /mnt/Scsi btrfs device add /dev/sdm1 /mnt/Scsi (filling with data) and btrfs fi df /mnt/Scsi now tells Data, RAID0: total=183.18GB, used=76.60GB Data: total=80.01GB, used=79.83GB System, DUP: total=8.00MB, used=32.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=1.00GB, used=192.74MB Metadata: total=8.00MB, used=0.00 -- Data, RAID0 confuses me (not very much ...), and the system for metadata (RAID1) is not told. Viele Gruesse! Helmut -- 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
Re: failed disk (was: kernel 3.3.4 damages filesystem (?))
On Wed, May 09, 2012 at 04:25:00PM +0200, Helmut Hullen wrote: Du meintest am 07.05.12: [...] With a file system like ext2/3/4 I can work with several directories which are mounted together, but (as said before) one broken disk doesn't disturb the others. mkfs.btrfs -m raid1 -d single should give you that. Just a small bug, perhaps: created a system with mkfs.btrfs -m raid1 -d single /dev/sdl1 mount /dev/sdl1 /mnt/Scsi btrfs device add /dev/sdk1 /mnt/Scsi btrfs device add /dev/sdm1 /mnt/Scsi (filling with data) and btrfs fi df /mnt/Scsi now tells Data, RAID0: total=183.18GB, used=76.60GB Data: total=80.01GB, used=79.83GB System, DUP: total=8.00MB, used=32.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=1.00GB, used=192.74MB Metadata: total=8.00MB, used=0.00 -- Data, RAID0 confuses me (not very much ...), and the system for metadata (RAID1) is not told. DUP is two copies of each block, but it allows the two copies to live on the same device. It's done this because you started with a single device, and you can't do RAID-1 on one device. The first bit of metadata you write to it should automatically upgrade the DUP chunk to RAID-1. As to the spurious upgrade of single to RAID-0, I thought Ilya had stopped it doing that. What kernel version are you running? Out of interest, why did you do the device adds separately, instead of just this? # mkfs.btrfs -m raid1 -d single /dev/sdl1 /dev/sdk1 /dev/sdm1 Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- Comic Sans goes into a bar, and the barman says, We don't --- serve your type here. signature.asc Description: Digital signature
Re: failed disk (was: kernel 3.3.4 damages filesystem (?))
On Wed, May 09, 2012 at 03:37:35PM +0100, Hugo Mills wrote: On Wed, May 09, 2012 at 04:25:00PM +0200, Helmut Hullen wrote: Du meintest am 07.05.12: [...] With a file system like ext2/3/4 I can work with several directories which are mounted together, but (as said before) one broken disk doesn't disturb the others. mkfs.btrfs -m raid1 -d single should give you that. Just a small bug, perhaps: created a system with mkfs.btrfs -m raid1 -d single /dev/sdl1 mount /dev/sdl1 /mnt/Scsi btrfs device add /dev/sdk1 /mnt/Scsi btrfs device add /dev/sdm1 /mnt/Scsi (filling with data) and btrfs fi df /mnt/Scsi now tells Data, RAID0: total=183.18GB, used=76.60GB Data: total=80.01GB, used=79.83GB System, DUP: total=8.00MB, used=32.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=1.00GB, used=192.74MB Metadata: total=8.00MB, used=0.00 -- Data, RAID0 confuses me (not very much ...), and the system for metadata (RAID1) is not told. DUP is two copies of each block, but it allows the two copies to live on the same device. It's done this because you started with a single device, and you can't do RAID-1 on one device. The first bit of What Hugo said. Newer mkfs.btrfs will error out if you try to do this. metadata you write to it should automatically upgrade the DUP chunk to RAID-1. We don't upgrade chunks in place, only during balance. As to the spurious upgrade of single to RAID-0, I thought Ilya had stopped it doing that. What kernel version are you running? I did, but again, we were doing it only as part of balance, not as part of normal operation. Helmut, do you have any additional data points - the output of btrfs fi df right after you created FS or somewhere in the middle of filling it ? Also could you please paste the output of btrfs fi show and tell us what kernel version you are running ? Thanks, Ilya -- 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
