Hello, On Mon, 14 Dec 2015 11:46:43 +0800 xiafei wrote: > Hi all, > I have a question about the I/O of cephfs. > I configure cephfs with 2 OSDs, and 300PGs in two HDDs. Then I use the > iostat (iostat -kx 1 /dev/sdd1) to monitor the I/Os of the HDDs > (/dev/sdd1). The result is as follows: > > > The iostat shows that there are write requests every second. However I > do not execute any applications. What the source of the write I/O? > That's why you use atop and/or iotop to determine what program is writing to the disks. If it is indeed Ceph (ceph-osd process) writing to the disk then the question is indeed what causes that. I have no experience with CephFS, but quiescent RBD volume (mounted VM images) does not produce I/O by itself. You say that you're not running any application, but is the CephFS mounted somewhere? Regards, Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Rakuten Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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