Hi Igor,
Thanks!
I think the code needs to be corrected - the choice criteria for which
setting to use when
cct->_conf->bluestore_cache_size == 0
should be as follows:
1) See what kind of storage you have.
2) Select type-appropriate storage.
Is this code public-editable? I'll be happy to correct that.
Regards,
Boris.
On Tue, Feb 4, 2020 at 12:10 PM Igor Fedotov <ifedotov@xxxxxxx> wrote:
> Hi Boris,
>
> general settings (unless they are set to zero) override disk-specific
> settings .
>
> I.e. bluestore_cache_size overrides both bluestore_cache_size_hdd and
> bluestore_cache_size_ssd.
>
> Here is the code snippet in case you know C++
>
> if (cct->_conf->bluestore_cache_size) {
> cache_size = cct->_conf->bluestore_cache_size;
> } else {
> // choose global cache size based on backend type
> if (_use_rotational_settings()) {
> cache_size = cct->_conf->bluestore_cache_size_hdd;
> } else {
> cache_size = cct->_conf->bluestore_cache_size_ssd;
> }
> }
>
> Thanks,
>
> Igor
>
> On 2/4/2020 2:14 PM, Boris Epstein wrote:
> > Hello list,
> >
> > As stated in this document:
> >
> >
> https://docs.ceph.com/docs/master/rados/configuration/bluestore-config-ref/
> >
> > there are multiple parameters defining cache limits for BlueStore. You
> have
> > bluestore_cache_size (presumably controlling the cache size),
> > bluestore_cache_size_hdd (presumably doing the same for HDD storage only)
> > and bluestore_cache_size_ssd (presumably being the equivalent for SSD).
> My
> > question is, does bluestore_cache_size override the disk-specific
> > parameters, or do I need to set the disk-specific (or, rather, storage
> type
> > specific ones separately if I want to keep them to a certain value.
> >
> > Thanks in advance.
> >
> > Boris.
> > _______________________________________________
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>
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