CentOS - Jan 2010 - How to force iscsi to see the new LUN size

Hi,

I increased the size of one of the LUNs and on CentOS 5.4 if I restart 
iscsi (`service iscsi restart`) I'll see the the new size but this will 
disconnect all other LUNs.

I'm hoping that there is isciadm or some other command that will force 
iscsi to rediscover the LUNs but I can't seem to be able to come up with 
one.

Resize2fs says that there is nothing to be done. I'm not using LVM.

Any ideas?

Thanks
Peter

Peter Blajev wrote:
> Hi,
>
> I increased the size of one of the LUNs and on CentOS 5.4 if I restart 
> iscsi (`service iscsi restart`) I'll see the the new size but this will
> disconnect all other LUNs.
>
> I'm hoping that there is isciadm or some other command that will force 
> iscsi to rediscover the LUNs but I can't seem to be able to come up
with
> one.
>
> Resize2fs says that there is nothing to be done. I'm not using LVM.
>   
never tried this on iscsi, but it may well work...

echo ?B T L? > /sys/class/scsi_host/hostH/scan

where B T L are B, T, L, are the bus, target, and LUN IDs, and hostH is 
the Host.

----- Original Message ----
> From: Peter Blajev <pblajev at ucsd.edu>
> To: CentOS Mailing List <centos at centos.org>
> Sent: Fri, January 15, 2010 10:34:47 PM
> Subject: [CentOS] How to force iscsi to see the new LUN size
> 
> Hi,
> 
> I increased the size of one of the LUNs and on CentOS 5.4 if I restart 
> iscsi (`service iscsi restart`) I'll see the the new size but this will
> disconnect all other LUNs.
> 
> I'm hoping that there is isciadm or some other command that will force 
> iscsi to rediscover the LUNs but I can't seem to be able to come up
with
> one.
You can logout from that particular target and then login again

iscsiadm --mode node --targetname target --portal portalip:3260 --logout
iscsiadm --mode node --targetname target --portal portalip:3260 --login



Hope this helps


Fer

On Fri, Jan 15, 2010 at 05:34:47PM -0800, Peter Blajev
wrote:
> Hi,
> 
> I increased the size of one of the LUNs and on CentOS 5.4 if I restart 
> iscsi (`service iscsi restart`) I'll see the the new size but this will
> disconnect all other LUNs.
> 
> I'm hoping that there is isciadm or some other command that will force 
> iscsi to rediscover the LUNs but I can't seem to be able to come up
with
> one.
> 
> Resize2fs says that there is nothing to be done. I'm not using LVM.
> 
> Any ideas?
> 
Try: iscsiadm -m node -R
It should work with CentOS 5.3 and newer.

Also you might be interested of this:
http://pasik.reaktio.net/rhel5-online-iscsi-resize-test.txt

-- Pasi