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From: Bryan Green <bgreen@××××××××.gov> |
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Date: Fri, 08 Dec 2006 09:15:54 -0800 |
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"John R. Dunning" writes: |
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> From: Bryan Green <bgreen@××××××××.gov> |
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> |
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> I was able to patch the kernel, but the server was somewhat unstable. |
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> |
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> Do you remember how it was unstable? That's the kind of thing I'd very much |
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> like to understand, as we're proposing to depend heavily on it. If there are |
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> issues, whether specifically tied to our patches or not, I'd love to know |
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> about them. |
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I remember the system was stable until we tried to shut it down. |
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Ah. I have observed lustre to get cranky when you try to boot the system out |
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from under it. In particular, if you go to all the servers and /sbin/shutdown |
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without first shutting down lustre, I've seen it hang. Given the nature of |
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lustre, that didn't surprise me a lot :-} The times I've shut down lustre in |
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the correct order (shut down clients, then oss's, then mds, then mgs) it's |
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always behaved itself. |
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It would lock up while |
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shutting down, possibly while unmounting filesystems. I also did not get to do extensive |
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testing of the system, so I don't know if it would have been stable under real use of the |
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Lustre filesystem. |
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Ok. Like I said, I've found a few bugs, but I've never seen it act unstable |
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in real use. |
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> I also tried to make a custom kernel for |
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> lustre 1.4, but ultimately hit too many roadblocks. I did learn a bit about how |
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> to use 'quilt' though. |
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> |
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> Hmmm. Maybe not. Our stuff ditches quilt. |
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I just used quilt when working with 1.4. I did not have an ebuild for that. |
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I could never get quilt to work so just ditched it. You don't need it anyhow, |
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if you ./configure blah-blah --disable-quilt, it works fine. I imagine if you |
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were doing core development on lustre, in particular trying to actually build |
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the large collection of patches they ship with it, quilt would be handy, but |
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for just trying to get the kernel patched, my scripts skip it. |
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-- |
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