I frequently expand drives on my VMs. How can I rescan the drives without rebooting the server?
The easiest solution is to use scsitools script rescan-scsi-bus.
sudo apt-get install scsitools sudo rescan-scsi-bus
To do it without installing a utility on 14.04:
echo '1' > /sys/class/scsi_disk/0\:0\:0\:0/device/rescan
IMPORTANT: Be sure to replace the 0:0:0:0 with the appropriate disk for your purposes.
( A bit old question )
Example for system disk without reboot
Rescan the bus for the new size :
# echo 1 > /sys/class/block/sda/device/rescan
Expand your partition ( Works with ansible )
# parted ---pretend-input-tty /dev/sda resizepart F 2 Yes 100% - F for Fix - 2 for partition - Yes to confirm - 100% for whole partition
# resiz2fs /dev/sda2