> rbd
> ------------------
> default: 6000
> cache=none : 6000
> cache=writeback : 7000
from qemu-kvm/block/rbd.c:
--------------------
if (flags & BDRV_O_NOCACHE) {
rados_conf_set(s->cluster, "rbd_cache", "false");
} else {
rados_conf_set(s->cluster, "rbd_cache", "true");
-------------------
They also suggest to use writeback, so that should be default for rdb.
> sheepdog
> ------------------
> default: 300
> cache=none : 300
> cache=writeback : 300
Sheepdog ignores the BDRV_O_NOCACHE flag.
see qemu-kvm/block/sheepdog.c
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