Hi Sage,
Am 04.12.2013 17:13, schrieb Sage Weil:
Hi James,
Can you generate an OSD log with 'debug filestore = 20' for an idle period?
i had reported something very similiar with no result to zendesk (#702).
Stefan
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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