On 02/10/2020 23:19, Andrew Beattie wrote:
Jonathan,
I suggest you get a formal statement from Lenovo as the DSS-G Platform
is no longer an IBM platform.
But for ESS based platforms the answer would be, it is not supported to
run anything on the IO Servers other than GNR and the relevant Scale
management services, due to the fact that if you lose an IO Server, or
if you in an extended maintenance window the Server needs to host all
the work that would be being performed by both IO servers.
In the past ~500 days the Infiniband to Ethernet gateway has shifted
~13GB of data, or about 25MB a day. Meanwhile in the last 470 days the
DSS-G nodes have each shifted several PB. The proposed additional
traffic is a drop in the ocean.
On my actual routers which shift much more data (over 300TB externally)
with an uptime of ~180 days at the moment the CPU time consumed by
keepalived is just under 31 minutes or about 8 seconds a day. These are
much punier CPU's too. The proposed additional CPU usage is another drop
in the ocean.
Given Lenovo sold the *same* configuration with x3650's and SR650's the
"need all the CPU grunt" is somewhat fishy. Between the bid being
submitted and actual tender award the SR650's came out and we paid a bit
extra to uplift to the newer server hardware with exactly the same disk
configuration. I believe IBM have done the same with the ESS/GNR servers
too over time the same applies there too.
IMHO given keepalived is a base RHEL package, IBM/Lenovo should be
offering running Infiniband to Ethernet gateways on the DSS/ESS nodes as
a supported configuration for mixed network technology clusters :-)
Running a couple extra servers for this purpose is obnoxious from an
environmental standpoint. That's IBM's green credentials out the window
if you ask me.
I would note under those rules running a Nagios, Zabbix etc. client on
the nodes is not permitted either. I would suggest that most sites would
be rather unhappy about that :-)
> I don't know if Lenovo have different point if view.
>
Problem is when I ring up for support on my DSS-G I speak to an IBM
employee not a Lenovo one :-)
JAB.
--
Jonathan A. Buzzard Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG
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