Date: Mon, 2 Jul 2018 19:33:26 +0000 (UTC) From: Rick Macklem <rmacklem@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r335872 - head/usr.sbin/nfsd Message-ID: <201807021933.w62JXQji013802@repo.freebsd.org>
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Author: rmacklem Date: Mon Jul 2 19:33:26 2018 New Revision: 335872 URL: https://svnweb.freebsd.org/changeset/base/335872 Log: Document the "#mds_path" suffix for the "-p" command line option. r335871 added support for an optional suffix of "#mds_path" that can be applied to each entry in the "-p" option argument. This specifies that the DS should be used to store files for the file system on the MDS at "mds_path". This patch documents this optional suffix. This is a content change. Modified: head/usr.sbin/nfsd/nfsd.8 Modified: head/usr.sbin/nfsd/nfsd.8 ============================================================================== --- head/usr.sbin/nfsd/nfsd.8 Mon Jul 2 19:26:31 2018 (r335871) +++ head/usr.sbin/nfsd/nfsd.8 Mon Jul 2 19:33:26 2018 (r335872) @@ -28,7 +28,7 @@ .\" @(#)nfsd.8 8.4 (Berkeley) 3/29/95 .\" $FreeBSD$ .\" -.Dd May 31, 2018 +.Dd June 30, 2018 .Dt NFSD 8 .Os .Sh NAME @@ -126,21 +126,40 @@ so the .Dq server hostname must resolve to an IPv4 address and support mounts on that address. This needs to be extended to support IPv6 addresses in the near future. +This can optionally be followed by a '#' and the mds_path, which is the +directory path for an exported file system on this MDS. +If this is specified, it means that this DS is to be used to store data +files for this mds_path file system only. +If this optional component does not exist, the DS will be used to store data +files for all exported MDS file systems. The DS storage file systems must be mounted on this system before the .Nm is started with this option specified. +.br For example: .sp nfsv4-data0:/data0,nfsv4-data1:/data1 .sp -Would specify two DS servers called nfsv4-data0 and nfsv4-data1 that comprise +would specify two DS servers called nfsv4-data0 and nfsv4-data1 that comprise the data storage component of the pNFS service. +These two DSs would be used to store data files for all exported file systems +on this MDS. The directories .Dq /data0 and .Dq /data1 are where the data storage servers exported storage directories are mounted on this system (which will act as the MDS). +.br +Whereas, for the example: +.sp +nfsv4-data0:/data0#/export1,nfsv4-data1:/data1#/export2 +.sp +would specify two DSs as above, however nfsv4-data0 will be used to store +data files for +.Dq /export1 +and nfsv4-data1 will be used to store data files for +.Dq /export2 . .El .It Fl m Ar mirror_level This option is only meaningful when used with the @@ -155,6 +174,17 @@ The .Dq mirror_level would normally be set to 2 to enable mirroring, but can be as high as NFSDEV_MAXMIRRORS. +There must be at least +.Dq mirror_level +DSs for each exported file system on the MDS, as specified in the +.Fl p +option. +This implies that, for the above example using "#/export1" and "#/export2", +mirroring cannot be done. +There would need to be two DS entries for each of "#/export1" and "#/export2" +in order to support a +.Dq mirror_level +of two. .Pp If mirroring is enabled, the server must use the Flexible File layout.
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