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Recoverpoint config_io_throttling question.
Hi all
Can someone explain the mechanism by which this command works? The reason I am asking is we saw a performance impact on the host when this command was used to throttle IO between the RPA's. (The reason the command was run was because of the rate of read by the RPAs on the production storage caused a severe impact on host performance).
Does the command work exclusively on IO reads done by the RPA on production storage or does it work on all IO on the production storage and so throttle host reads too?
RickBrunner1
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October 21st, 2010 09:00
No it only places restrictions on the RPA's not host.. On RP it effects both reads and writes.
Is the CG a CRR or CDP or CLR? Are you doing Async or Sync Replication? IP or FC based replication?
-rick
NeilHopwood
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October 24th, 2010 23:00
Hi Rick, its CRR async over FC. Does this affect how the throttle works then?
Thanks for the update!
Neil
Anonymous
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October 25th, 2010 00:00
Hey Neil long time :-)
I believe the reason Rick was asking is that in Sync replication, slower IO of the RPA (due to IO throttling) could affect the production as well.
Since you are using async, it should not affect the host in any way.
What it could affect is the journal lag, becase distribution at the target journal requires a lot of IO (4/5 times the incoming writes) and when it is slowed due to the IO throttling it may not be able to keep up with the incoming writes and the lag increases.
Regards,
Niv