1STAFD(8) STAFD(8)
2
6 stafd - STorage Appliance Finder
7
9 stafd [OPTIONS...]
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12 stafd is a system daemon that can be used to automatically locate and
13 connect to NVMe-oF Discovery Controllers using mDNS service discovery.
14 It can also be manually configured with stafd.conf(5) to connect to
15 Discovery Controllers that cannot be located using mDNS.
16
18 The following options are understood:
19 -h, --help
21 Print the help text and exit.
22 --version
24 Print the version string and exit.
25 -fFILE, --conf-file=FILE
27 Specify a different configuration file than stafd.conf(5) (default:
28 /etc/stas/stafd.conf).
29 -s, --syslog
31 Send messages to syslog instead of stdout. Use this when running
32 stafd as a daemon. (default: false).
33 --tron
35 Trace ON. (default: false)
36 --idl=FILE
38 Print D-Bus IDL to FILE and exit.
39
41 On success, 0 is returned, a non-zero failure code otherwise.
42
44 stafd is managed by systemd. The following operations are supported:
45 Table 1.
47 ┌─────────────────────────────────────┬────────────────────────────┐
48 │Command │ Description │
49 ├─────────────────────────────────────┼────────────────────────────┤
50 │ $ systemctl start stafd │ Start daemon. │
51 ├─────────────────────────────────────┼────────────────────────────┤
52 │ $ systemctl stop stafd │ Stop daemon. The SIGTERM │
53 │ │ signal is used to tell the │
54 │ │ daemon to stop. │
55 ├─────────────────────────────────────┼────────────────────────────┤
56 │ $ systemctl restart stafd │ Effectively a stop + │
57 │ │ start. │
58 ├─────────────────────────────────────┼────────────────────────────┤
59 │ $ systemctl reload stafd │ Reload configuration. This │
60 │ │ is done in real time │
61 │ │ without restarting the │
62 │ │ daemon. The SIGHUP signal │
63 │ │ is used to tell the daemon │
64 │ │ to reload its │
65 │ │ configuration file. Note │
66 │ │ that configuration │
67 │ │ parameters that affect │
68 │ │ connections (e.g. kato), │
69 │ │ will not apply to existing │
70 │ │ connections. Only │
71 │ │ connections established │
72 │ │ after the configuration │
73 │ │ was changed will utilize │
74 │ │ the new configuration │
75 │ │ parameters. │
76 └─────────────────────────────────────┴────────────────────────────┘
77
79 stafd use the GLib main loop. The GLib Python module provides several
80 low-level building blocks that stafd requires. In addition, many Python
81 modules "play nice" with GLib such as dasbus (D-Bus package) and pyudev
82 (UDev package). GLib also provides additional components such as
83 timers, signal handlers, and much more.
84 stafd connects to the avahi-daemon using D-Bus. The avahi-daemon, or
86 simply Avahi, is an mDNS discovery service used for zero-configuration
87 networking (zeroconf). stafd registers with Avahi to automatically
88 locate Central Discovery Controllers (CDC) and Direct Discovery
89 Controllers (DDC). When Avahi finds Discovery Controllers (DC), it
90 notifies stafd which connects to the DC with the help of the libnvme
91 library. Once a connection to a DC is established, stafd can retrieve
92 the discovery log pages from that DC and cache them in memory.
93
95 stafd can automatically locate discovery controllers (DC) with the help
96 of Avahi and connect to them. However, stafd can also operate in a
97 non-automatic mode based on manually entered configuration. In other
98 words, DCs can be entered in a configuration named
99 /etc/stas/stafd.conf. This configuration file also provides additional
100 parameters, such as log-level attributes used for debugging purposes.
101
103 The interface to stafd is D-Bus. This allows other programs, such as
104 stafctl, to communicate with stafd. The D-Bus address is
105 org.nvmexpress.staf.
106
108 stafd.conf(5), stafd.service(8), stafctl(1), org.nvmexpress.staf(5).
109nvme-stas 2.2.2 STAFD(8)