I am fairly new to ISCSI and SAN technology but having recently invested in the technology I am trying to find out exactly what can and can not be manipulated, filesystem wise, without requiring a reboot. I am using the inbuilt software ISCSI initiator and multipathing in CentOS 5.1. My steps so far. Create 10GB volume on SAN # iscsiadm -m session -R # fdisk /dev/mapper/mpath0 # kpartx -a /dev/mapper/mpath0 # mke2fs -j /dev/mapper/mpath0p1 # mount /dev/mapper/mpath0p1 /test-mount <--works fine to here--> Now I want to extend the volume on the SAN to 15GB run fdisk and use resize2fs to extend the filesystem, is this possible without a reboot? Currently, I don't seem to be able to get fdisk to see the new disk size after extending the volume. I know this can be done using LVM if I created 2 volumes rather than extending but I am curious to know if it can be done without LVM. Any other tips about what can be done with ISCSI would be welcome. Thanks Dean