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Hello list,
i map ~30 rbds per xenserver
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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