On 2019-10-16T11:28:25, " Honggang(Joseph) Yang " <eagle.rtlinux@xxxxxxxxx> wrote:
I'm glad to see more performance work and caching happening in Ceph!
I admit calling this a "tier" (to get the bike shedding done first ;-)
is confusing me, because that used to mean something different. This
seems to me to be more of a BlueStore feature based on hints/access from
the upper layers?
So perhaps, at that level, it'd make sense to instead use the space on
the RocksDB partition/device for this caching operation, instead of yet
an additional device? (Intuitively, that's what most users already
expect it does, anyway.)
How would this, compared to bcache, possibly handle situations where
multiple OSDs share one caching device?
And does this only promote the local shard/replica? I'm wondering how
this would affect EC pools.
Regards,
Lars
--
SUSE Linux GmbH, GF: Felix Imendörffer, Mary Higgins, Sri Rasiah, HRB 21284 (AG Nürnberg)
"Architects should open possibilities and not determine everything." (Ueli Zbinden)
