[CentOS] ISCSI help

[Alain Spineux]

On Jan 31, 2008 12:40 PM, Plant, Dean <dean.plant at 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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-- 
Alain Spineux
aspineux gmail com
May the sources be with you