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144 lines
5.0 KiB
Groff
144 lines
5.0 KiB
Groff
.\" Copyright (c) 2017 Rick Macklem
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd June 30, 2018
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.Dt PNFSDSFILE 8
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.Os
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.Sh NAME
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.Nm pnfsdsfile
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.Nd display
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a pNFS data storage file's location(s) and/or modify the
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.Dq pnfsd.dsfile
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extended attribute for them
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.Sh SYNOPSIS
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.Nm
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.Op Fl qz
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.Op Fl s Ar dshostname
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.Op Fl c Ar old-dshostname,new-dshostname
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.Op Fl m Ar mirror_level
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.Op Fl r Ar dshostname
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.Ar mdsfile
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.Sh DESCRIPTION
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The
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.Nm
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command displays the data storage file's location(s) for a pNFS service and/or
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modifies the
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.Dq pnfsd.dsfile
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extended attribute on the
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.Ar mdsfile .
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A pNFS service maintains a data storage file for each regular file on
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the MetaData Server (MDS) on one or more of the Data Servers (DS).
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If mirroring is enabled, the data storage file will be on more that one of the DSs.
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Unless command options are specified, this command displays the location(s)
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of the data storage file for the MDS file
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.Ar mdsfile .
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It must be used on the MDS and the
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.Ar mdsfile
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must be a file on the exported local file system and not an NFSv4.1 mount.
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This information is stored in the
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.Dq pnfsd.dsfile
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extended attribute for this
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.Ar mdsfile .
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The command line options allow the information in the
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.Dq pnfsd.dsfile
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extended attribute to be changed.
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.Pp
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The following options are available:
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.Bl -tag -width Ds
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.It Fl q
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This option suppresses printing of the DS file's location(s).
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.It Fl z
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This option specifies that the file handle field of the pnfsd.dsfile
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extended attribute is to filled with all zero bits.
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This forces the pNFS MDS to do a Lookup RPC against the DS to acquire the file
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handle to update it.
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Normally this will only be necessary after the DS file has been recovered
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from a backup, causing the file handle to change.
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.It Fl s Ar dshostname
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This option can be used with
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.Fl z
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so that the zeroing out of the file handle is only done if the DS server
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is the one specified by this option.
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.It Fl c Ar old-dshostname,new-dshostname
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This option allows a sysadmin to replace the host IP# for the DS in the
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pnfsd.dsfile extended attribute.
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The old-hostname must resolve to the IP# already in the pnfsd.dsfile extended
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attribute or the replacement will not be done.
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If the old-dshostname matches, then the IP# is replaced by the first AF_INET
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or AF_INET6 address that
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.Xr getaddrinfo 3
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returns for the new-dshostname.
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Changing a DS server's host IP# should be avoided, but this option will
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allow it to be changed, if the change is unavoidable.
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.It Fl m Ar mirror_level
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This option adds entrie(s) to the extended attributes with IP address set
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to 0.0.0.0 to bring the number of entries up to
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.Dq mirror_level .
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It can be used by a system administrator to prepare a file for mirroring
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via the
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.Xr pnfsdscopymr
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command with
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.Fl r
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option.
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.It Fl r Ar dshostname
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This option sets the IP address of the extended attribute entry for the
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.Ar dshostname
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to 0.0.0.0 so that it will no longer be used.
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.Pp
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This is meant to be used when mirroring is enabled and the
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.Ar dshostname
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DS is disabled, so that it can be re-enabled once it is repaired.
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This needs to be done for all files in the exported MDS tree where
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the data may not be up-to-date on the repaired DS when it is re-enabled.
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After being re-enabled, the command
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.Xr pnfsdscopymr 1
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with the
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.Dq -r
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option
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will be used to copy the file's data to this repaired DS and then update the
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extended attribute to use it.
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.Pp
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A typical use of this will be within a
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.Xr find 1
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for all regular files in the MDS's exported tree.
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.sp
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For example, if the disabled DS is nfsv4-data3:
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.br
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# cd <top-level-exported-directory-on-MDS>
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.br
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# find . -type f -exec pnfsdsfile -q -r nfsv4-data3 {} \\;
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.El
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.Sh SEE ALSO
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.Xr find 1 ,
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.Xr getaddrinfo 3 ,
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.Xr nfsv4 4 ,
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.Xr pnfs 4 ,
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.Xr nfsd 8 ,
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.Xr pnfsdscopymr 8 ,
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.Xr pnfsdskill 8
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.Sh HISTORY
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The
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.Nm
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command first appeared in
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.Fx 12.0 .
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