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openstack: Add numbers to disk requirements #3669

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Jun 1, 2020
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openstack: Add numbers to disk requirements #3669

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4 changes: 2 additions & 2 deletions docs/user/openstack/README.md
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Expand Up @@ -122,9 +122,9 @@ sudo podman run \
--rw=write
```

Look for the 99th percentile under `fsync/fdatasync/sync_file_range` -> `sync percentiles`.
The command must be run as superuser.

Caution about the measurement units: fio fluidly adjusts the scale between ms/µs/ns depending on the numbers.
In the command output, look for the the 99th percentile of [fdatasync](https://linux.die.net/man/2/fdatasync) durations (`fsync/fdatasync/sync_file_range` -> `sync percentiles`). The number must be less than 10ms (or 10000µs: fio fluidly adjusts the scale between ms/µs/ns depending on the numbers).

**Look for spikes.** Even if the baseline latency looks good, there may be spikes where it comes up, triggering issues that result in API being unavailable.

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