On Sat, 10 Aug 2013, Chris Samuel <ch...@csamuel.org> wrote: > On Sun, 4 Aug 2013 03:37:22 PM Bart Noordervliet wrote: > > a sufficiently up-to-date kernel and btrfs tool will provide the > > 'btrfs device stats' command, which should give you the info you want. > > This is what it looks like: > > chris@quad:~/Downloads/Linux/FileSystems/BtrFS/btrfs-progs$ sudo ./btrfs > device stats /srv/DR > [/dev/sdb3].write_io_errs 0 > [/dev/sdb3].read_io_errs 0 > [/dev/sdb3].flush_io_errs 0 > [/dev/sdb3].corruption_errs 0 > [/dev/sdb3].generation_errs 0
Thanks Chris and Bart. Would it be possible to get the man page updated to include a brief description of those errors? The first three are somewhat obvious in meaning (although not obvious in how they would happen) and the fourth is very obvious. But what does generation_errs mean? I'm seeing some on one system. Should I be concerned? If I write a Nagios check which ones should be warnings and which ones errors? Also why does it give the following errors about trying to open /dev/sr0 when using a BTRFS RAID-1 filesystem? Below is for a RAID-1 over /dev/sdb and /dev/sdc. # btrfs device stats /dev/sdb failed to open /dev/sr0: No medium found failed to open /dev/sr0: No medium found [/dev/sdb].write_io_errs 0 [/dev/sdb].read_io_errs 0 [/dev/sdb].flush_io_errs 0 [/dev/sdb].corruption_errs 0 [/dev/sdb].generation_errs 0 # btrfs device stats /dev/sdc failed to open /dev/sr0: No medium found failed to open /dev/sr0: No medium found [/dev/sdc].write_io_errs 0 [/dev/sdc].read_io_errs 0 [/dev/sdc].flush_io_errs 0 [/dev/sdc].corruption_errs 0 [/dev/sdc].generation_errs 0 Why is it even searching for the other part when only a single device is specified and why can't it give stats without checking /dev/sr0 when checking a single device when it can do so while checking all devices? # btrfs device stats /dev/sdd1 failed to open /dev/sr0: No medium found failed to open /dev/sr0: No medium found [/dev/sdd1].write_io_errs 0 [/dev/sdd1].read_io_errs 136 [/dev/sdd1].flush_io_errs 0 [/dev/sdd1].corruption_errs 0 [/dev/sdd1].generation_errs 0 # btrfs device stats /dev/sdd2 failed to open /dev/sr0: No medium found failed to open /dev/sr0: No medium found [/dev/sdd2].write_io_errs 0 [/dev/sdd2].read_io_errs 0 [/dev/sdd2].flush_io_errs 0 [/dev/sdd2].corruption_errs 0 [/dev/sdd2].generation_errs 0 # btrfs device stats /mnt/backup/ [/dev/sdd1].write_io_errs 0 [/dev/sdd1].read_io_errs 136 [/dev/sdd1].flush_io_errs 0 [/dev/sdd1].corruption_errs 0 [/dev/sdd1].generation_errs 0 [/dev/sdd2].write_io_errs 0 [/dev/sdd2].read_io_errs 0 [/dev/sdd2].flush_io_errs 0 [/dev/sdd2].corruption_errs 0 [/dev/sdd2].generation_errs 0 Thanks. -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/ -- 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
