After performing some tests, I noticed that after removing SD_IOSTATS functionality from the kernel, the write performances of Lustre was 4 times faster. On a Lustre 1.8.7 client, I untared a tarfile of a directory containing about 225,000 files (6.4GB). I used time to measure the time it takes to perform the operation. I performed the tests with two Lustre 1.8.7 servers with identical hardware. One is running Fedora 12 with a 2.6.32-19 patched kernel and the other one is running Fedora 7 with a 2.6.22-14 patched kernel. With both servers, it took about 4 minutes to untar the tarfile when running the kernel without SD_IOSTATS compared to about 16 minutes when running the kernel with SD_IOSTATS.
Is that normal that SD_IOSTATS has a so big impact on Lustre write performances? Denis Charland UNIX Systems Administrator National Research Council Canada
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