Do you think 4GB RAM for two OSD's is low, even with 1 OSD and 4GB memory i encounter OOM during recovery.
This is just a test setup to try with ceph.
I am planning to use ceph in 36 drive system with Xeon e5v2 proc, 32 GB RAM, 10Gb nic.
So, i am trying to optimize on memory usage on test setup which can be latter used if using ceph.
On Sun 22 Sep, 2019, 12:02 PM Ashley Merrick, <singapore@xxxxxxxxxxxxxx> wrote:
I'm not aware of any memory settings that control rebuild memory usage.
You are running very under on RAM, have you tried adding more swap or adjusting /proc/sys/vm/swappiness---- On Fri, 20 Sep 2019 20:41:09 +0800 Amudhan P <amudhan83@xxxxxxxxx> wrote ----Hi,_______________________________________________I am using ceph mimic in a small test setup using the below configuration.OS: ubuntu 18.041 node running (mon,mds,mgr) + 4 core cpu and 4GB RAM and 1 Gb lan3 nodes each having 2 osd's, disks are 2TB + 2 core cpu and 4G RAM and 1 Gb lan1 node acting as cephfs client + 2 core cpu and 4G RAM and 1 Gb lanconfigured cephfs_metadata_pool (3 replica) and cephfs_data_pool erasure 2+1.When running a script doing multiple folders creation ceph started throwing error late IO due to high metadata workload.once after folder creation complete PG's degraded and I am waiting for PG to complete recovery but my OSD's starting to crash due to OOM and restarting after some time.Now my question is I can wait for recovery to complete but how do I stop OOM and OSD crash? basically want to know the way to control memory usage during recovery and make it stable.I have also set very low PG metadata_pool 8 and data_pool 16.I have already set "mon osd memory target to 1Gb" and I have set max-backfill from 1 to 8.Attached msg from "kern.log" from one of the node and snippet of error msg in this mail.---------error msg snippet -----------bash: fork: Cannot allocate memorySep 18 19:01:57 test-node1 kernel: [341246.765644] msgr-worker-0 invoked oom-killer: gfp_mask=0x14200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null), order=0, oom_score_adj=0
Sep 18 19:02:00 test-node1 kernel: [341246.765645] msgr-worker-0 cpuset=/ mems_allowed=0
Sep 18 19:02:00 test-node1 kernel: [341246.765650] CPU: 1 PID: 1737 Comm: msgr-worker-0 Not tainted 4.15.0-45-generic #48-UbuntuSep 18 19:02:02 test-node1 kernel: [341246.765833] Out of memory: Kill process 1727 (ceph-osd) score 489 or sacrifice child
Sep 18 19:02:03 test-node1 kernel: [341246.765919] Killed process 1727 (ceph-osd) total-vm:3483844kB, anon-rss:1992708kB, file-rss:0kB, shmem-rss:0kB
Sep 18 19:02:03 test-node1 kernel: [341246.899395] oom_reaper: reaped process 1727 (ceph-osd), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Sep 18 22:09:57 test-node1 kernel: [352529.433155] perf: interrupt took too long (4965 > 4938), lowering kernel.perf_event_max_sample_rate to 40250regardsAmudhan
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