thanks for sharing. Which btrfs mount options did you use? Am 29.06.2012 00:37, schrieb Jim Schutt:
Hi, Lots of trouble reports go by on the list - I thought it would be useful to report a success. Using a patch (https://lkml.org/lkml/2012/6/28/446) on top of 2.5-rc4 for my OSD servers, the same kernel for my Linux clients, and a recent master branch tip (git://github.com/ceph/ceph commit 4142ac44b3f), I was able to sustain streaming writes from 166 linux clients for 2 hours: On 166 clients: dd conv=fdatasync if=/dev/zero of=/mnt/ceph/stripe-4M/1/zero0.`hostname -s` bs=4k count=65536k Elapsed time: 7274.55 seconds Total data: 45629732.553 MB (43515904 MiB) Aggregate rate: 6272.516 MB/s That kernel patch was critical; without it this test runs into trouble after a few minutes because the kernel runs into trouble looking for pages to merge during page compaction. Also critical were the ceph tunings I mentioned here: http://www.spinics.net/lists/ceph-devel/msg07128.html -- Jim -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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