Hi Chirstian,
My configuration is as follows: Two nodes: node0 (10.10.0.23), node1(10.10.0.24) node0: Monitor, MDS, OSD0 in /dev/sdd1 node1: OSD1 in /dev/sdd1 The cephfs is mounted using: mount.ceph 10.10.0.23:6789:/ /mnt/mycephfs/ After finishing configuration (PGs are active+clean), I use the iostat cmd to monitor the /dev/sdd1 in node0. The iostat shows that there are write I/Os for about 15minutes. Then there are no I/Os in the OSDs. I am not sure where these write I/Os come from. Thanks.
Best regards, Fei Xia
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/
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