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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