How to list GlusterFS volume options

Listing GlusterFS volume options exposes the effective tunables applied to a volume, which helps explain changes in performance, healing behavior, and client-side consistency across a cluster.

A GlusterFS volume maintains an option dictionary managed by glusterd, and the gluster CLI reads that dictionary with gluster volume get to report option keys (such as performance.* or cluster.*) with their current values.

Option output depends on volume type and which keys were explicitly set; keys not listed are generally using built-in defaults or inherited settings for the running version. Run the commands from a trusted node with management access and treat copied option listings as operational metadata when sharing logs or documentation.

Steps to list GlusterFS volume options:

List volumes to confirm the target volume name.
```
$ sudo gluster volume list
volume1
volume2
```

Show all configured option keys and values for the volume.

$ sudo gluster volume get volume1 all
Option                                  Value
------                                  -----
cluster.granular-entry-heal             on
features.quota                          off
performance.client-io-threads           on
performance.readdir-ahead               on
transport.address-family                inet
##### snipped #####

Keys not present in the output are generally using defaults for the running GlusterFS version and volume type.

Filter the option list to a prefix when checking a category of settings.
```
$ sudo gluster volume get volume1 all | grep '^performance\.'
performance.client-io-threads           on
performance.readdir-ahead               on
```
Replace performance. with features. or cluster. to narrow output by subsystem.

Query a single option to confirm its current value.

$ sudo gluster volume get volume1 performance.readdir-ahead
Option                                  Value
------                                  -----
performance.readdir-ahead               on