Please excuse my brain-fart. We're using 24 disks on the servers in
question. Only after discussing this further with a colleague did we
realize this.
This brings us right to the minimum-spec which generally isn't a good idea.
Sincerely
-Dave
On 11/09/17 11:38 AM, bulk.schulz@xxxxxxxxxxx wrote:
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Hi Everyone,
I wonder if someone out there has a similar problem to this?
I keep having issues with memory usage. I have 2 OSD servers wiith 48G
memory and 12 2TB OSDs. I seem to have significantly more memory than
the minimum spec, but these two machines with 2TB drives seem to OOM
kill and crash periodically -- basically any time the cluster goes into
recovery for even 1 OSD this happens.
12 Drives * 2TB = 24 TB. By using the 1GB RAM per 1TB Disk rule: I
should need only 24TB or so.
I am testing and benchmarking at this time so most changes are fine. I
am abusing this filesystem considerably by running 14 clients with
something that is more or less dd each to a different file but that's
the point :)
When it's working, the performance is really good. 3GB/s with 3x
replicated data pool up to around 10GB/s with 1X replication (just for
kicks and giggles) My bottleneck is likely the SAS channels to those
disks.
I'm using the 12.2.0 release running on Centos 7
Testing cephfs with one MDS and 3 montors. The MON/MDS are not on the
servers in question.
Total of around 350 OSDs (all spinning disk) most of which are 1TB
drives on 15 servers that are a bit older with Xeon E5620's.
Dual QDR Infiniband (20GBit) fabrics (1 cluster and 1 client).
Any thoughts? Am I missing some tuning parameter in /proc or something?
Thanks
-Dave
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