1 .\" Copyright (c) 2017 Rick Macklem
3 .\" Redistribution and use in source and binary forms, with or without
4 .\" modification, are permitted provided that the following conditions
6 .\" 1. Redistributions of source code must retain the above copyright
7 .\" notice, this list of conditions and the following disclaimer.
8 .\" 2. Redistributions in binary form must reproduce the above copyright
9 .\" notice, this list of conditions and the following disclaimer in the
10 .\" documentation and/or other materials provided with the distribution.
12 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
13 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
14 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
15 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
16 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
17 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
18 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
19 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
20 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
21 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 a pNFS data storage file's location(s) and/or modify the
32 extended attribute for them
36 .Op Fl s Ar dshostname
37 .Op Fl c Ar old-dshostname,new-dshostname
38 .Op Fl m Ar mirror_level
39 .Op Fl r Ar dshostname
44 command displays the data storage file's location(s) for a pNFS service and/or
47 extended attribute on the
49 A pNFS service maintains a data storage file for each regular file on
50 the MetaData Server (MDS) on one or more of the Data Servers (DS).
51 If mirroring is enabled, the data storage file will be on more that one of the DSs.
52 Unless command options are specified, this command displays the location(s)
53 of the data storage file for the MDS file
55 It must be used on the MDS and the
57 must be a file on the exported local file system and not an NFSv4.1 mount.
58 This information is stored in the
60 extended attribute for this
62 The command line options allow the information in the
64 extended attribute to be changed.
66 The following options are available:
69 This option suppresses printing of the DS file's location(s).
71 This option specifies that the file handle field of the pnfsd.dsfile
72 extended attribute is to filled with all zero bits.
73 This forces the pNFS MDS to do a Lookup RPC against the DS to acquire the file
75 Normally this will only be necessary after the DS file has been recovered
76 from a backup, causing the file handle to change.
77 .It Fl s Ar dshostname
78 This option can be used with
80 so that the zeroing out of the file handle is only done if the DS server
81 is the one specified by this option.
82 .It Fl c Ar old-dshostname,new-dshostname
83 This option allows a sysadmin to replace the host IP# for the DS in the
84 pnfsd.dsfile extended attribute.
85 The old-hostname must resolve to the IP# already in the pnfsd.dsfile extended
86 attribute or the replacement will not be done.
87 If the old-dshostname matches, then the IP# is replaced by the first AF_INET
88 or AF_INET6 address that
90 returns for the new-dshostname.
91 Changing a DS server's host IP# should be avoided, but this option will
92 allow it to be changed, if the change is unavoidable.
93 .It Fl m Ar mirror_level
94 This option adds entrie(s) to the extended attributes with IP address set
95 to 0.0.0.0 to bring the number of entries up to
97 It can be used by a system administrator to prepare a file for mirroring
103 .It Fl r Ar dshostname
104 This option sets the IP address of the extended attribute entry for the
106 to 0.0.0.0 so that it will no longer be used.
108 This is meant to be used when mirroring is enabled and the
110 DS is disabled, so that it can be re-enabled once it is repaired.
111 This needs to be done for all files in the exported MDS tree where
112 the data may not be up-to-date on the repaired DS when it is re-enabled.
113 After being re-enabled, the command
118 will be used to copy the file's data to this repaired DS and then update the
119 extended attribute to use it.
121 A typical use of this will be within a
123 for all regular files in the MDS's exported tree.
125 For example, if the disabled DS is nfsv4-data3:
127 # cd <top-level-exported-directory-on-MDS>
129 # find . -type f -exec pnfsdsfile -q -r nfsv4-data3 {} \\;
142 command first appeared in