On Tue, 24 Oct 2017, shadow_lin wrote:
> BLOCKQUOTE{margin-Top: 0px; margin-Bottom: 0px; margin-Left: 2em} body
> {border-width:0;margin:0} img {border:0;margin:0;padding:0} Hi All,
> The cluster has 24 osd with 24 8TB hdd.
> Each osd server has 2GB ram and runs 2OSD with 2 8TBHDD. I know the memory
> is below the remmanded value, but this osd server is an ARM server so I
> can't do anything to add more ram.
> I created a replicated(2 rep) pool and an 20TB image and mounted to the test
> server with xfs fs.
>
> I have set the ceph.conf to this(according to other related post suggested):
> [osd]
> bluestore_cache_size = 104857600
> bluestore_cache_size_hdd = 104857600
> bluestore_cache_size_ssd = 104857600
> bluestore_cache_kv_max = 103809024
>
> osd map cache size = 20
> osd map max advance = 10
> osd map share max epochs = 10
> osd pg epoch persisted max stale = 10
> The bluestore cache setting did improve the situation,but if i try to write
> 1TB data by dd command(dd if=/dev/zero of=test bs=1G count=1000) to rbd the
> osd will eventually be killed by oom killer.
> If I only wirte like 100G data once then everything is fine.
>
> Why does the osd memory usage keep increasing whle writing ?
> Is there anything I can do to reduce the memory usage?
There is a bluestore memory bug that was fixed just after 12.2.1 was
released; it will be fixed in 12.2.2. In the meantime, you can run
consider running the latest luminous branch (not fully tested) from
https://shaman.ceph.com/builds/ceph/luminous.
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