Hi, We are running XFS filesystem on one of out machines which is a big store (~3TB) of different data files (mostly images). Quite recently we experienced some performance problems - machine wasn't able to keep up with updates. After some investigation it turned out that open() syscalls (open for writing) were taking significantly more time than they should eg. 15-20ms vs 100-150us. Some more info about our workload as I think it's important here: our XFS filesystem is exclusively used as data store, so we only read and write our data (we mostly write). When new update comes it's written to a temporary file eg. /mountpoint/some/path/.tmp/file When file is completely stored we move it to final location eg. /mountpoint/some/path/different/subdir/newname That means that we create lots of files in /mountpoint/some/path/.tmp directory, but directory is empty as they are moved (rename() syscall) shortly after file creation to a different directory on the same filesystem. The workaround which I found so far is to remove that directory (/mountpoint/some/path/.tmp in our case) with its content and re-create it. After this operation open() syscall goes down to 100-150us again. Is this a known problem ? Information regarding our system: CentOS 5.8 / kernel 2.6.18-308.el5 / kmod-xfs-0.4-2 Let me know if you need to know anything more. Cheers, Marcin _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
