Thank you ALL
Finally the light came to me, I thought that iscsi was a file sharing protocol and now I see it isn´t. I think I´m going to implement GFS on it, (its a good oportunity to learn something new :-) Thaks all again for your help ESG 2009/4/20 Graham Wood <[email protected]> > On Mon, Apr 20, 2009 at 06:56:23PM +0200, ESGLinux wrote: > > Yes I agree with you, but I thought with iscsi i can do the same as with > > NFS. > No. iSCSI is a way of remotely getting access to a block device. NFS is a > way of accessing > a network filesystem. They server completely different purposes, and run > at different parts > of the "stack" as well. > > > any suggestion that makes me see the light ;.) > As has already been stated, you cannot do it. > > You cannot mount ext3 on two machines at the same time, and write data. If > you want to > write from one at a time, don't mount it on the other. It's THAT simple. > > There is NO other answer with ext3. If you want to have it mounted twice > your choices are: > - NFS > - GFS/OCFS2/etc. > > The standard reason for wanting to avoid GFS and the like is the complexity > - unfortunately > the complexity is required because (as previously stated) of cache > coherency. > > As for your example of NFS, I can tell you from experience that it doesn't > work as well as > you seem to think - it is still quite possible for NFS to get things wrong, > and give you the > wrong data - however, the protocol has been designed with that in mind, and > you get > "sensible" errors when it detects things. > > We've got NFS servers that are accessed by 1000+ clients - and creating a > file on one can > take a few minutes to appear on the others, however the way NFS works means > that this is > done "safely", and it will recover. Ext3 has NO functionality to do this. > > > So, in summary, "No". > > Graham > > -- > Linux-cluster mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/linux-cluster >
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