1.\" Copyright (c) 2017 Rick Macklem 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 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. 11.\" 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 22.\" SUCH DAMAGE. 23.\" 24.\" $FreeBSD$ 25.\" 26.Dd June 30, 2018 27.Dt PNFSDSFILE 8 28.Os 29.Sh NAME 30.Nm pnfsdsfile 31.Nd display 32a pNFS data storage file's location(s) and/or modify the 33.Dq pnfsd.dsfile 34extended attribute for them 35.Sh SYNOPSIS 36.Nm 37.Op Fl qz 38.Op Fl s Ar dshostname 39.Op Fl c Ar old-dshostname,new-dshostname 40.Op Fl m Ar mirror_level 41.Op Fl r Ar dshostname 42.Ar mdsfile 43.Sh DESCRIPTION 44The 45.Nm 46command displays the data storage file's location(s) for a pNFS service and/or 47modifies the 48.Dq pnfsd.dsfile 49extended attribute on the 50.Ar mdsfile . 51A pNFS service maintains a data storage file for each regular file on 52the MetaData Server (MDS) on one or more of the Data Servers (DS). 53If mirroring is enabled, the data storage file will be on more that one of the DSs. 54Unless command options are specified, this command displays the location(s) 55of the data storage file for the MDS file 56.Ar mdsfile . 57It must be used on the MDS and the 58.Ar mdsfile 59must be a file on the exported local file system and not an NFSv4.1 mount. 60This information is stored in the 61.Dq pnfsd.dsfile 62extended attribute for this 63.Ar mdsfile . 64The command line options allow the information in the 65.Dq pnfsd.dsfile 66extended attribute to be changed. 67.Pp 68The following options are available: 69.Bl -tag -width Ds 70.It Fl q 71This option suppresses printing of the DS file's location(s). 72.It Fl z 73This option specifies that the file handle field of the pnfsd.dsfile 74extended attribute is to filled with all zero bits. 75This forces the pNFS MDS to do a Lookup RPC against the DS to acquire the file 76handle to update it. 77Normally this will only be necessary after the DS file has been recovered 78from a backup, causing the file handle to change. 79.It Fl s Ar dshostname 80This option can be used with 81.Fl z 82so that the zeroing out of the file handle is only done if the DS server 83is the one specified by this option. 84.It Fl c Ar old-dshostname,new-dshostname 85This option allows a sysadmin to replace the host IP# for the DS in the 86pnfsd.dsfile extended attribute. 87The old-hostname must resolve to the IP# already in the pnfsd.dsfile extended 88attribute or the replacement will not be done. 89If the old-dshostname matches, then the IP# is replaced by the first AF_INET 90or AF_INET6 address that 91.Xr getaddrinfo 3 92returns for the new-dshostname. 93Changing a DS server's host IP# should be avoided, but this option will 94allow it to be changed, if the change is unavoidable. 95.It Fl m Ar mirror_level 96This option adds entrie(s) to the extended attributes with IP address set 97to 0.0.0.0 to bring the number of entries up to 98.Dq mirror_level . 99It can be used by a system administrator to prepare a file for mirroring 100via the 101.Xr pnfsdscopymr 102command with 103.Fl r 104option. 105.It Fl r Ar dshostname 106This option sets the IP address of the extended attribute entry for the 107.Ar dshostname 108to 0.0.0.0 so that it will no longer be used. 109.Pp 110This is meant to be used when mirroring is enabled and the 111.Ar dshostname 112DS is disabled, so that it can be re-enabled once it is repaired. 113This needs to be done for all files in the exported MDS tree where 114the data may not be up-to-date on the repaired DS when it is re-enabled. 115After being re-enabled, the command 116.Xr pnfsdscopymr 1 117with the 118.Dq -r 119option 120will be used to copy the the file's data to this repaired DS and then update the 121extended attribute to use it. 122.Pp 123A typical use of this will be within a 124.Xr find 1 125for all regular files in the MDS's exported tree. 126.sp 127For example, if the disabled DS is nfsv4-data3: 128.br 129# cd <top-level-exported-directory-on-MDS> 130.br 131# find . -type f -exec pnfsdsfile -q -r nfsv4-data3 {} \\; 132.El 133.Sh SEE ALSO 134.Xr find 1 , 135.Xr getaddrinfo 3 , 136.Xr nfsv4 4 , 137.Xr pnfs 4 , 138.Xr nfsd 8 , 139.Xr pnfsdscopymr 8 , 140.Xr pnfsdskill 8 141.Sh HISTORY 142The 143.Nm 144command first appeared in 145.Fx 12.0 . 146