On Thu, Aug 04, 2011 at 10:13:00PM +0200, Helmut Hullen wrote: > Hallo, Hugo, > > Du meintest am 04.08.11: > > > What are the symptoms of not having the device node? (i.e. how > > would I diagnose this particular problem?) > > The days get shorter and shorter ... > > running > > btrfs device scan > > produces something like > > ... > failed to read /dev/hdc > failed to read /dev/hdc8 > failed to read /dev/lmscd > failed to read /dev/sdc1 > failed to read /dev/sdb4 > failed to open /dev/btrfs-control skipping device registration OK, that's the symptom we can put in the problems list for this particular issue. > failed to read /dev/sdd8 > failed to read /dev/hdc9 > failed to read /dev/sdf8 > ... > > a lot of error messages for not existing devices and 1 error messages on > behalf of "btrfs-control". > > My "/dev" directory has worked (without "udev") without any problem for > more than 10 years, it contains (has contained) a lot of entries for > nearly every case of disk. Therefore i had started with > > btrfs device scan 2>/dev/null > > and that deleted the "btrfs-control" error message too. And > > btrfs device scan 2>&1 | grep -v 'failed to' > > didn't help too. Goffredo published a patch to scan only the contents of /proc/partitions, which should at least shut up the scan over the issue of non-existent devices in /dev. That's in the next integration-* branch (going out shortly... I'm just integrating and updating the balance management patches before i release). > btrfs-show > > doesn't need "/dev/btrfs-control", it shows the existing btrfs > partition(s). > > If I remember correct: mounting works, writing works, reading works. And > adding another partition works. > > But there are strange messages when I try to resize or delete. > > I'll try to reproduce these messages ... Thanks. We can add those as symptoms to the solution later. How's this? https://btrfs.wiki.kernel.org/index.php/Problem_FAQ#I_get_the_message_.22failed_to_open_.2Fdev.2Fbtrfs-control_skipping_device_registration.22_from_.22btrfs_dev_scan.22 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 --- "I lost my leg in 1942. Some bastard stole it in a --- pub in Pimlico."
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