[stgt] read only access on 1 LUN for multiple initiators

Kapetanakis Giannis bilias at edu.physics.uoc.gr
Fri Feb 26 23:20:21 CET 2010


This probably have been brought up before, but I couldn't find any info.

I'd like to setup multiple initiators (web/ftp cluster) to access 
read-only the same iscsi target.
I would prefer to do this without cluster fs (ie GFS) if possible.
However I want to have right access on the target server locally.

I managed to do this but I have the following problem:
When I write something on the target (locally on the server)
the updates are not propagated to the initiators.
If I unmount and mount again I can see the changes.

I'm sharing /dev/vg01/iscsi which is an ext3 fs. It's locally mounted on 
and also mounted (/dev/sde -> /mnt) on clients.

Server is centos 5.4 scsi-target-utils-0.0-6.20091205snap.el5_4.1

<target iqn.2008-09.com.example:server.target2>
     backing-store /dev/vg01/iscsi
     incominguser user pass
     write-cache off

client is Fedora 12 iscsi-initiator-utils-

scsi22 : iSCSI Initiator over TCP/IP
scsi 22:0:0:0: RAID              IET      Controller       0001 PQ: 0 
scsi 22:0:0:0: Attached scsi generic sg5 type 12
scsi 22:0:0:1: Direct-Access     IET      VIRTUAL-DISK     0001 PQ: 0 
sd 22:0:0:1: Attached scsi generic sg6 type 0
sd 22:0:0:1: [sde] 16777216 512-byte logical blocks: (8.58 GB/8.00 GiB)
sd 22:0:0:1: [sde] Write Protect is off
sd 22:0:0:1: [sde] Mode Sense: 79 00 00 08
sd 22:0:0:1: [sde] Write cache: disabled, read cache: enabled, doesn't 
support DPO or FUA
  sde: unknown partition table
sd 22:0:0:1: [sde] Attached SCSI disk
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.

so is GFS the only option?


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