[CentOS] USB drive is "read-only file system" and cannot umount - how to fix

[Robert Moskowitz]

Just disconnected, power-cycled then reconnected the drive. 
/var/log/messages tell me:

Oct 26 20:50:10 homebase kernel: EXT4-fs warning (device sdd1): 
ext4_clear_journal_err: Filesystem error recorded from previous mount: 
IO failure
Oct 26 20:50:10 homebase kernel: EXT4-fs warning (device sdd1): 
ext4_clear_journal_err: Marking fs in need of filesystem check.
Oct 26 20:50:10 homebase kernel: EXT4-fs (sdd1): warning: mounting fs 
with errors, running e2fsck is recommended
Oct 26 20:50:10 homebase kernel: EXT4-fs (sdd1): recovery complete
Oct 26 20:50:10 homebase kernel: EXT4-fs (sdd1): mounted filesystem with 
ordered data mode. Opts:

First it comes in as sdd when previously it was sdc.  But the drive is 
now R/W.

So do I run e2fsck, and with what options.  From the manpage I am 
assuming I better umount it first...


On 10/25/2015 11:16 AM, Robert Moskowitz wrote:
>
>
> On 10/25/2015 11:12 AM, Barry Brimer wrote:
>> I 'just' noticed that at some point, my USB backup drive on my server
>>> is
>>> mounted as read-only and all of my background sync cron jobs have been
>>> failing.
>>>
>>> So I need to fix this without rebooting the server.
>>> How can I get this drive r/w?
>> Have you tried "mount -o remount,rw <mountpoint>"?
>
> # mount -o remount,rw /media/HD103SI/
> mount: cannot remount block device /dev/sdc1 read-write, is 
> write-protected
>
>
>> The unanswered question here is why did it go read only, and does 
>> this condition still exist?
>
> The burning question of the day......
>
> Should I 'just' unplug it, power cycle it and reconnect it?
>
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
>