Re: Ceph 16.2.x mon compactions, disk writes

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Some of it is transferable to RocksDB on mons nonetheless.

> but their specs exceed Ceph hardware recommendations by a good margin

Please point me to such recommendations, if they're on <> I'll get them updated.

> On Oct 13, 2023, at 13:34, Zakhar Kirpichenko <zakhar@xxxxxxxxx> wrote:
> Thank you, Anthony. As I explained to you earlier, the article you had sent is about RocksDB tuning for Bluestore OSDs, while the issue at hand is not with OSDs but rather monitors and their RocksDB store. Indeed, the drives are not enterprise-grade, but their specs exceed Ceph hardware recommendations by a good margin, they're being used as boot drives only and aren't supposed to be written to continuously at high rates - which is what unfortunately is happening. I am trying to determine why it is happening and how the issue can be alleviated or resolved, unfortunately monitor RocksDB usage and tunables appear to be not documented at all. 
> /Z
> On Fri, 13 Oct 2023 at 20:11, Anthony D'Atri <anthony.datri@xxxxxxxxx <mailto:anthony.datri@xxxxxxxxx>> wrote:
>> cf. Mark's article I sent you re RocksDB tuning.  I suspect that with Reef you would experience fewer writes.  Universal compaction might also help, but in the end this SSD is a client SKU and really not suited for enterprise use.  If you had the 1TB SKU you'd get much longer life, or you could change the overprovisioning on the ones you have.
>>> On Oct 13, 2023, at 12:30, Zakhar Kirpichenko <zakhar@xxxxxxxxx <mailto:zakhar@xxxxxxxxx>> wrote:
>>> I would very much appreciate it if someone with a better understanding of
>>> monitor internals and use of RocksDB could please chip in.

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