Hi Matt,
Yes, we've experimented a bit with consumer SSDs, and also done some
benchmarks.
The main reason for SSDs is typically to improve IOPS for small writes,
since even HDDs will usually give you quite good aggregated bandwidth as
long as you have enough of them - but for high-IOPS usage most
The main reason for SSDs is typically to improve IOPS for small writes, but for
that usage most (all) consumer SSDs we have tested perform badly in Ceph.
The reason for this is that Ceph requires SYNC writes, and since consumer SSDs
(and now even some cheap datacenter ones) don't have capacitors
We are using 4TB Kingston DC500M drives for 6+2 EC RBD data pools, 2 OSDs per
disk. They deliver great iops, but I think they are TLC, so probably not
comparable with QLC drives. I think QLC drives are OK for mostly cold/static
data due to their performance drop when running full:
https://www.h
Matt Larson writes:
> Is anyone trying Ceph clusters containing larger (4-8TB) SSD drives?
>
> 8TB SSDs are described here (
> https://www.anandtech.com/show/16136/qlc-8tb-ssd-review-samsung-870-qvo-sabrent-rocket-q
> ) and make use QLC NAND flash memory to reach the costs and capacity.
> Curre
