On Fri, Mar 06, 2020 at 07:29:22PM +0530, Alok Jain wrote: > Hi Guys, > > Thanks for providing the forum to check the issue, I already got > really helpful responses and need one more help wrt to EXT4 log > messages coming in /var/log/messages file > > 1) I have iSCSI device attached to my VM > 2) Copied and extracted files in the attached device > 3) Unmount and disconnected the device, post disconnect operation I > can see lots of EXT4 file system errors in /var/log/messages file, > attaching the same (err.txt) for review. > > I am not sure what these log messages are correspond to as the device > was already disconnected at Feb I1:22:42, but th*e ext4 log messages > came after that, can you please review and share your findings. There's nothing really deep here. Ext4 wasn't able to write to /dev/sdd1. Assuming that /dev/sdd is your iSCSI device, it's probably because the connection to the iSCSI device had gotten disrupted. This is similar to what you might see if you were writing to a USB thumbstick and the USB device is unceremoniously yanked out. One possible scenario is thar while the umount was *started*, but it had not completed writing out dirty blocks before the iSCSI device was disconnected. If that's true, this would be a case of operator error. - Ted
