This command allows a sysadmin to display or modify the pnfsd.dsfile extended attribute used by the pNFS MDS server in various ways. Its main use is to set a DS's IP address to 0.0.0.0 when that DS has failed, so that it will not be used for the file when brought back online after being repaired.
134 lines
4.7 KiB
Groff
134 lines
4.7 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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.\" $FreeBSD$
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.\"
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.Dd March 11, 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 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 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 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 appeared in FreeBSD12.
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