On Sun, Nov 30, 2014 at 06:09:38PM +1100, Scott Ferguson wrote: > On 30 November 2014 at 17:47, Joel Roth <jo...@pobox.com> wrote: > > I notice that /dev/sdb1, an ext4 partition on a USB drive has remounted > > read-only. > > > > I try > > > > umount /dev/sdb1 > > > > then > > > > fsck /dev/sdb1 > > > > fsck from util-linux 2.25.2 > > e2fsck 1.42.12 (29-Aug-2014) > > /dev/sdb1 is in use. > > e2fsck: Cannot continue, aborting. > > > > Is there a way that a volume can be in use without being > > mounted? > > Yes. If you have disk errors (not data, disk). It'll be prominent in > your logs (if it's a SATA grep for ATA). For your sake I hope I'm > wrong or that it's just a loose connection.
Nothing obvious in dmesg, which seems like the only relevant log with recent entries. syslog, kern.log, auth.log and debug show no changes since June. > You may find that the device had problems during boot, and the fsck is > 'trying' to fix them - but is unable to access the disk. For months, maybe longer, I've had irregularities with USB drives. When mounted for a long time, I will get errors. In this situation, I expect that if I unmount the drive, I should be able to run fsck, not have to reboot because some reference in the kernel/driver/fs code says the unmounted drive is still in use. Regards, Joel > <snipped> > > > > The underlying issue is that the driver detects an I/O > > error. > > See comment above. > > > > Regards, > > > > Joel > > > > > > -- > > Joel Roth > > > > Kind regards > -- Joel Roth -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20141130124937.GA2503@sprite
