On Tue, 2008-04-29 at 09:05 -0700, Kilian CAVALOTTI wrote: > Hi Brian, Hi Kilian,
> I was precisely wondering if it was possible to use a file residing on a > Lustre filesystem as a swap file. There certainly has been some historic use and testing of swap on Lustre. I'm not sure what it's current state is TBH. The last bug in bugzilla I can find about swap and Lustre is bug 5794/5749/5188 filed over two years ago (however updated just recently) in reference to some of our regression testing we do with swap on Lustre. It seems the final outcome is that it has been flagged (just today in fact) as a 1.6.6 blocker. The timing is absolutely uncanny! > # cd /scratch > /scratch # grep /scratch /proc/mounts > [EMAIL PROTECTED]:/scratch /scratch lustre rw 0 0 > /scratch # dd if=/dev/zero of=./swapfile bs=1024 count=1024 > 10240+0 records in > 10240+0 records out > /scratch # mkswap ./swapfile > Setting up swapspace version 1, size = 104853 kB > /scratch # swapon -a ./swapfile > swapon: ./swapfile: Invalid argument > > Is that expected? I would think not, no. There is some reference in bug 5188 that we only test it for "real/remote OSTs" and "non-TCP" interconnects. I wonder if either of those match your situation. You might file a bug about it, including the usual data -- syslog from the client you did the swapon on for example. A (-1) debug log from the client right at the time of the swapon would probably be useful. b.
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