Hello list,
i map ~30 rbds per xenserver
<https://github.com/vico-research-and-consulting/RBDSR> host by using
rbd-nbd to run virtual machines on these devices.
I have the following questions:
* Is it possible to use rbd cache for rbd-nbd? I assume that this is
true, but the documentation does not make a clear statement about this.
(http://docs.ceph.com/docs/luminous/rbd/rbd-config-ref/(
* If i configure caches like described at
http://docs.ceph.com/docs/luminous/rbd/rbd-config-ref/, are there
dedicated caches per rbd-nbd/krbd device or is there a only a single
cache area.
How can i identify the rbd cache with the tools provided by the
operating system?
* Can you provide some hints how to about adequate cache settings for
a write intensive environment (70% write, 30% read)?
Is it a good idea to specify a huge rbd cache of 1 GB with a max
dirty age of 10 seconds?
Regards
Marc
Our system:
* Luminous/12.2.5
* Ubuntu 16.04
* 5 OSD Nodes (24*8 TB HDD OSDs, 48*1TB SSD OSDS, Bluestore, 6Gb Cache
per OSD)
* Size per OSD, 192GB RAM, 56 HT CPUs)
* 3 Mons (64 GB RAM, 200GB SSD, 4 visible CPUs)
* 2 * 10 GBIT, SFP+, bonded xmit_hash_policy layer3+4
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