Hi James,
Can you generate an OSD log with 'debug filestore = 20' for an idle period?
Thanks!
sage
James Harper <[email protected]> wrote:
>I have been testing osd on btrfs, and the first thing I notice is that
>there is constant write activity when idle.
>
>The write activity hovers between 5Mbytes/second and 30Mbytes/second,
>and averages around 9Mbytes/second (as determined by iostat -x 30). On
>average, iostat is showing around 90 w/s, and 25% util.
>
>There were two OSD's on this server running btrfs and both were
>behaving like this. I changed one back to xfs last night and it's not
>showing any write activity at idle now.
>
>There is no matching write activity on the journal device, but the high
>writes stop when I kill the OSD process.
>
>kworker, ceph-osd, and btrfs-cleaner processes feature highly in iotop
>
>Is this normal? And is it a problem, or just btrfs doing background
>writes for some reason?
>
>I'm running dumpling on Debian, fwiw.
>
>Thanks
>
>James
>
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