On 5/14/19 5:12 PM, Christopher Browne via talk wrote:
Sounds like it may be the wrong moment in time to be adopting
BCache-related stuff ;-)
Has anyone been poking at this sort of stuff? A *loooong* time ago, I used
to follow ReiserFS pretty closely, back when that project was a technical
matter, as opposed to being (rather properly!) overshadowed by a murder
investigation :-(
We use it for every customer's Openstack cloud for almost every
openstack component. Nova, Ceph, Swift, Keystone, and MySQL are the
major services, and each has a bcache underlay along with a hardware
RAID controller.
It has proven to be quite a reliable (and fast) setup, and even in the
event of a power cut we haven't lost any data.
For nova especially where users are interacting with VMs, it means a
customer can have large amounts of storage allocated for a VM, and
writes feel as though the whole system is running on an SSD.
Likewise for Keystone & MySQL, where in busy clouds with clustered
MySQL, tokens can take a long time to generate, fetch, and authenticate
without the SSD backing.
All around quite useful, just don't run it on the leading edge of GCC,
Kernel, and OS releases!
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