Reef osd_memory_target and swapping

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Hello.

I'm seeing the following in the Dashboard  -> Configuration panel
for osd_memory_target:

Default:
4294967296

Current Values:
osd: 9797659437,
osd: 10408081664,
osd: 11381160192,
osd: 22260320563

I have 4 hoists in the cluster right now - all OSD+MGR+MON.  3 have 128GB
RAM, the 4th has 256GB.  On the host with 256GB, top shows some OSD
processes with very high VIRT and RES values - the highest VIRT OSD has
13.0g.  The highest RES is 8.5g.

All 4 systems are currently swapping, but the 256GB system has much higher
swap usage.

I am confused why I have 4 current values for osd_memory_target, and
especially about the 4th one at 22GB.

Also, I'm recalling that there might be a recommendation to disable swap.
and I could easily do 'swapoff -a' when the swap usage is lower than the
free RAM.

Can anybody shed any light on this?

Thanks.

-Dave

--
Dave Hall
Binghamton University
kdhall@xxxxxxxxxxxxxx
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