On 27 Feb 2010 at 0:23, Kapetanakis Giannis wrote: > Hi, > > 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.
Naturally, read-only media don't propagate changes, because they don't change. Remember that clients (especially Linux) doe cache blocks locally, and they do not invalidate that cache. So you could even experience application crashes when accessing data structures that were partially cached while being changed on the original. > If I unmount and mount again I can see the changes. Naturally, because unmount invalidates the cached blocks for the device. Regards, Ulrich > > I'm sharing /dev/vg01/iscsi which is an ext3 fs. It's locally mounted on > server > 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 > initiator-address 10.0.0.0/26 > write-cache off > </target> > > client is Fedora 12 iscsi-initiator-utils-6.2.0.870-10.fc12.1.x86_64 > > scsi22 : iSCSI Initiator over TCP/IP > scsi 22:0:0:0: RAID IET Controller 0001 PQ: 0 > ANSI: 5 > scsi 22:0:0:0: Attached scsi generic sg5 type 12 > scsi 22:0:0:1: Direct-Access IET VIRTUAL-DISK 0001 PQ: 0 > ANSI: 5 > 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? > > Giannis > > -- > You received this message because you are subscribed to the Google Groups > "open-iscsi" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/open-iscsi?hl=en. > -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/open-iscsi?hl=en.
