On Jan 31, 2008 12:40 PM, Plant, Dean dean.plant@roke.co.uk wrote:

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.

Without a reboot of the centos, certainly; just restart the iscsi service! Without stopping the iscsi ? Probably, take a look at the iscsiadm manual.

My steps so far.

Create 10GB volume on SAN # iscsiadm -m session -R

# fdisk /dev/mapper/mpath0 # kpartx -a /dev/mapper/mpath0

You dont need to create additional partition, just use /dev/mapper/mpath0 instead of /dev/mapper/mpath1 !

# 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.

If you want to do the job without dismounting the ext3 partition, this is an interesting challenge. Because with LVM this is too easy :-)

Any other tips about what can be done with ISCSI would be welcome.

Thanks

Dean

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