Bootstack Charmers Next Bcache Tuning
- By BootStack Charmers - NEXT
- Storage
| Channel | Version | Revision | Published | Runs on |
|---|---|---|---|---|
| latest/stable | 2 | 2 | 18 Mar 2021 |
juju deploy bootstack-charmers-next-bcache-tuning
You will need Juju 2.9 to be able to run this command. Learn how to upgrade to Juju 2.9.
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Platform:
20.04
18.10
18.04
16.04
Overview
This charm performs best-practice performance tuning of bcache devices on SD/NVMe based installations.
Cache Devices
Disable performance based congestion behaviour - the SSD or NVMe will in all likelyhood always be faster than the underlying spindle:
congested_read_threshold_us: 0
congested_write_threshold_us: 0
Bcache Devices
Disable writethrough of sequential data writes:
sequential_cutoff: 0
Increase the amount of dirty data the cache device will hold before starting to persist to the backing device:
writeback_percent: 10
Usage
To use this charm, simple deploy and relation to principle services:
juju deploy bcache-tuning
juju add-relation bcache-tuning ceph-osd
juju add-relation bcache-tuning nova-compute
This charm presents no configuration options.