Re: How to reduce HDD OSD flapping due to rocksdb compacting event?

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On 4/10/19 9:07 AM, Charles Alva wrote:
> Hi Ceph Users,
> 
> Is there a way around to minimize rocksdb compacting event so that it
> won't use all the spinning disk IO utilization and avoid it being marked
> as down due to fail to send heartbeat to others?
> 
> Right now we have frequent high IO disk utilization for every 20-25
> minutes where the rocksdb reaches level 4 with 67GB data to compact.
> 

How big is the disk? RocksDB will need to compact at some point and it
seems that the HDD can't keep up.

I've seen this with many customers and in those cases we offloaded the
WAL+DB to an SSD.

How big is the data drive and the DB?

Wido

> 
> Kind regards,
> 
> Charles Alva
> Sent from Gmail Mobile
> 
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