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PNFSDSFILE(8)		  BSD System Manager's Manual		 PNFSDSFILE(8)

     pnfsdsfile	-- display a pNFS data storage file's location(s) and/or mod-
     ify the "pnfsd.dsfile" extended attribute for them

     pnfsdsfile	[-qz] [-s dshostname] [-c old-dshostname,new-dshostname]
		[-m mirror_level] [-r dshostname] mdsfile

     The pnfsdsfile command displays the data storage file's location(s) for a
     pNFS service and/or modifies the "pnfsd.dsfile" extended attribute	on the
     mdsfile.  A pNFS service maintains	a data storage file for	each regular
     file on the MetaData Server (MDS) on one or more of the Data Servers
     (DS).  If mirroring is enabled, the data storage file will	be on more
     that one of the DSs.  Unless command options are specified, this command
     displays the location(s) of the data storage file for the MDS file
     mdsfile.  It must be used on the MDS and the mdsfile must be a file on
     the exported local	file system and	not an NFSv4.1 mount.  This informa-
     tion is stored in the "pnfsd.dsfile" extended attribute for this mdsfile.
     The command line options allow the	information in the "pnfsd.dsfile" ex-
     tended attribute to be changed.

     The following options are available:

     -q	     This option suppresses printing of	the DS file's location(s).

     -z	     This option specifies that	the file handle	field of the pnfsd.ds-
	     file extended attribute is	to filled with all zero	bits.  This
	     forces the	pNFS MDS to do a Lookup	RPC against the	DS to acquire
	     the file handle to	update it.  Normally this will only be neces-
	     sary after	the DS file has	been recovered from a backup, causing
	     the file handle to	change.

     -s	dshostname
	     This option can be	used with -z so	that the zeroing out of	the
	     file handle is only done if the DS	server is the one specified by
	     this option.

     -c	old-dshostname,new-dshostname
	     This option allows	a sysadmin to replace the host IP# for the DS
	     in	the pnfsd.dsfile extended attribute.  The old-hostname must
	     resolve to	the IP#	already	in the pnfsd.dsfile extended attribute
	     or	the replacement	will not be done.  If the old-dshostname
	     matches, then the IP# is replaced by the first AF_INET or
	     AF_INET6 address that getaddrinfo(3) returns for the new-dshost-
	     name.  Changing a DS server's host	IP# should be avoided, but
	     this option will allow it to be changed, if the change is un-

     -m	mirror_level
	     This option adds entrie(s)	to the extended	attributes with	IP ad-
	     dress set to to bring the number of entries up to
	     "mirror_level".  It can be	used by	a system administrator to pre-
	     pare a file for mirroring via the pnfsdscopymr command with -r

     -r	dshostname
	     This option sets the IP address of	the extended attribute entry
	     for the dshostname	to so that it will no longer be	used.

	     This is meant to be used when mirroring is	enabled	and the
	     dshostname	DS is disabled,	so that	it can be re-enabled once it
	     is	repaired.  This	needs to be done for all files in the exported
	     MDS tree where the	data may not be	up-to-date on the repaired DS
	     when it is	re-enabled.  After being re-enabled, the command
	     pnfsdscopymr(1) with the "-r" option will be used to copy the
	     file's data to this repaired DS and then update the extended at-
	     tribute to	use it.

	     A typical use of this will	be within a find(1) for	all regular
	     files in the MDS's	exported tree.

	     For example, if the disabled DS is	nfsv4-data3:
	     # cd <top-level-exported-directory-on-MDS>
	     # find . -type f -exec pnfsdsfile -q -r nfsv4-data3 {} \;

     find(1), getaddrinfo(3), nfsv4(4),	pnfs(4), nfsd(8), pnfsdscopymr(8),

     The pnfsdsfile command first appeared in FreeBSD 12.0.

BSD				 June 30, 2018				   BSD


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