Error when expending a synology NAS volume :
syno_poweroff_task -d [Press Enter] << This will bring down all services except the SSH.
vgchange -ay [Press Enter] << This will enable the volume
fsck.ext4 -pvf -C0 /dev/vg1000/lv [press Enter] << This will try to fix the error, pop out yes/no to let you chose when error show up.
fsck.ext4 -yvf -C0 /dev/vg1000/lv [Press Enter] << This will try to fix the error, system will automatic chose yes to fix error.
If -pvf can't work, please use -yvf instead. After the command fsck is completed, please reboot your DS with the reboot command.