Hi all, Sorry, I need to correct something about what I observed. I found pg_log file was on running OSD disk, but the file size was 0, so I think maybe OSD kept all pg log data in memory.
BTW, the CEPH version is 0.80.6 Thanks, Jan 2014-11-08 10:04 GMT+08:00 chen jan <janchen2...@gmail.com>: > Hi all, > > I'm trying to test pg_log mechanism under stress test by using a simple > 3 nodes with 15 osds ceph cluster(replica size is 2). The following were > test steps: > 1. Set mon_osd_down_out_interval to 2 days > 2. Using at least 10 threads FIO and librbd to send random 4KB r/w IOs > continuously. > > 3. Shutdown one node, that means 5 osds were down, and pg_log mechanism > started to work. > After running 1.5 days, I observed two results: > 1. There were no pg_log file on all running OSD disk > 2. Almost every running OSD process occupied up to 1 GB memory. > So my question was: It seemed like OSD kept all pg_log data in memory, was > that true? If not, could someone help to explain what happen to this? > > BTW, XFS was used in this environment. > > Thanks, > > Jan >
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