s4-provision: don't ask only 3 times for passwd in interactive mode
[Samba/gebeck_regimport.git] / docs-xml / manpages-3 / vfs_gpfs.8.xml
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1 <?xml version="1.0" encoding="iso-8859-1"?>
2 <!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
3 <refentry id="vfs_gpfs.8">
5 <refmeta>
6         <refentrytitle>vfs_gpfs</refentrytitle>
7         <manvolnum>8</manvolnum>
8         <refmiscinfo class="source">Samba</refmiscinfo>
9         <refmiscinfo class="manual">System Administration tools</refmiscinfo>
10         <refmiscinfo class="version">3.6</refmiscinfo>
11 </refmeta>
14 <refnamediv>
15         <refname>vfs_gpfs</refname>
16         <refpurpose>gpfs specific samba extensions like acls and prealloc</refpurpose>
17 </refnamediv>
19 <refsynopsisdiv>
20         <cmdsynopsis>
21                 <command>vfs objects = gpfs</command>
22         </cmdsynopsis>
23 </refsynopsisdiv>
25 <refsect1>
26         <title>DESCRIPTION</title>
28         <para>This VFS module is part of the
29         <citerefentry><refentrytitle>samba</refentrytitle>
30         <manvolnum>7</manvolnum></citerefentry> suite.</para>
32         <para>The <command>gpfs</command> VFS module is the home
33         for all gpfs extensions that Samba requires for proper integration
34         with GPFS. It uses the GPL library interfaces provided by GPFS.
35         </para>
37         <para>Currently the gpfs vfs module provides extensions in following areas :
38         <itemizedlist>
39         <listitem><para>NFSv4 ACL Interfaces with configurable options for GPFS</para></listitem>
40         <listitem><para>Kernel oplock support on GPFS</para></listitem>
41         <listitem><para>Lease support on GPFS</para></listitem>
42         </itemizedlist>
43         </para>
45         <para><command>NOTE:</command>This module follows the posix-acl behaviour
46         and hence allows permission stealing via chown. Samba might allow at a later
47         point in time, to restrict the chown via this module as such restrictions
48         are the responsibility of the underlying filesystem than of Samba.
49         </para>
51         <para>This module is stackable.</para>
53 </refsect1>
56 <refsect1>
57         <title>OPTIONS</title>
59         <variablelist>
61                 <varlistentry>
63                 <term>gpfs:sharemodes = [ yes | no ]</term>
64                 <listitem>
65                 <para>
66                 Enable/Disable cross node sharemode handling for GPFS.
67                 </para>
69                 <itemizedlist>
70                 <listitem><para>
71                 <command>yes(default)</command> - propagate sharemodes across all GPFS nodes.
72                 </para></listitem>
73                 <listitem><para>
74                 <command>no</command> - do not propagate sharemodes across all GPFS nodes.
75                 This should only be used if the GPFS file system is
76                 exclusively exported by Samba. Access by local unix application or
77                 NFS exports could lead to corrupted files.
78                 </para></listitem>
79                 </itemizedlist>
80                 </listitem>
82                 </varlistentry>
83                 <varlistentry>
85                 <term>gpfs:leases = [ yes | no ]</term>
86                 <listitem>
87                 <para>
88                 Enable/Disable cross node leases (oplocks) for GPFS.
89                 You should also set the <command>oplocks</command> and <command>kernel oplocks</command>
90                 options to the same value.
91                 </para>
93                 <itemizedlist>
94                 <listitem><para>
95                 <command>yes(default)</command> - propagate leases across all GPFS nodes.
96                 </para></listitem>
97                 <listitem><para>
98                 <command>no</command> - do not propagate leases across all GPFS nodes.
99                 This should only be used if the GPFS file system is
100                 exclusively exported by Samba. Access by local unix application or
101                 NFS exports could lead to corrupted files.
102                 </para></listitem>
103                 </itemizedlist>
104                 </listitem>
106                 </varlistentry>
108                 <varlistentry>
110                 <term>gpfs:hsm = [ yes | no ]</term>
111                 <listitem>
112                 <para>
113                 Enable/Disable announcing if this FS has HSM enabled.
114                 </para>
116                 <itemizedlist>
117                 <listitem><para>
118                 <command>no(default)</command> - Do not announce HSM.
119                 </para></listitem>
120                 <listitem><para>
121                 <command>no</command> - Announce HSM.
122                 </para></listitem>
123                 </itemizedlist>
124                 </listitem>
126                 </varlistentry>
128                 <varlistentry>
130                 <term>gpfs:getrealfilename = [ yes | no ]</term>
131                 <listitem>
132                 <para>
133                 Enable/Disable usage of the <command>gpfs_get_realfilename_path()</command> function.
134                 This improves the casesensitive wildcard file name access.
135                 </para>
137                 <itemizedlist>
138                 <listitem><para>
139                 <command>yes(default)</command> - use <command>gpfs_get_realfilename_path()</command>.
140                 </para></listitem>
141                 <listitem><para>
142                 <command>no</command> - do not use <command>gpfs_get_realfilename_path()</command>.
143                 It seems that <command>gpfs_get_realfilename_path()</command> doesn't work on AIX.
144                 </para></listitem>
145                 </itemizedlist>
146                 </listitem>
148                 </varlistentry>
149                 <varlistentry>
151                 <term>gpfs:winattr = [ yes | no ]</term>
152                 <listitem>
153                 <para>
154                 Enable/Disable usage of the windows attributes in GPFS.
155                 GPFS is able to store windows file attributes e.g. HIDDEN,
156                 READONLY, SYSTEM and others natively. That means Samba doesn't
157                 need to map them to permission bits or extended attributes.
158                 </para>
160                 <itemizedlist>
161                 <listitem><para>
162                 <command>no(default)</command> - do not use GPFS windows attributes.
163                 </para></listitem>
164                 <listitem><para>
165                 <command>yes</command> - use GPFS windows attributes.
166                 </para></listitem>
167                 </itemizedlist>
168                 </listitem>
170                 </varlistentry>
171                 <varlistentry>
173                 <term>gpfs:merge_writeappend = [ yes | no ]</term>
174                 <listitem>
175                 <para>
176                 GPFS ACLs doesn't know about the 'APPEND' right.
177                 This optionen lets Samba map the 'APPEND' right to 'WRITE'.
178                 </para>
180                 <itemizedlist>
181                 <listitem><para>
182                 <command>yes(default)</command> - map 'APPEND' to 'WRITE'.
183                 </para></listitem>
184                 <listitem><para>
185                 <command>no</command> - do not map 'APPEND' to 'WRITE'.
186                 </para></listitem>
187                 </itemizedlist>
188                 </listitem>
190                 </varlistentry>
191                 <varlistentry>
193                 <term>gpfs:refuse_dacl_protected = [ yes | no ]</term>
194                 <listitem>
195                 <para>
196                 As GPFS does not support the ACE4_FLAG_NO_PROPAGATE NFSv4 flag (which would be
197                 the mapping for the DESC_DACL_PROTECTED flag), the status of this flag is
198                 currently silently ignored by Samba. That means that if you deselect the "Allow
199                 inheritable permissions..." checkbox in Windows' ACL dialog and then apply the
200                 ACL, the flag will be back immediately.
201                 </para>
202                 <para>
203                 To make sure that automatic migration with e.g. robocopy does not lead to
204                 ACLs silently (and unintentionally) changed, you can set
205                 <command>gpfs:refuse_dacl_protected = yes</command> to enable an explicit
206                 check for this flag and if set, it will return NT_STATUS_NOT_SUPPORTED so
207                 errors are shown up on the Windows side and the Administrator is aware of
208                 the ACLs not being settable like intended
209                 </para>
211                 <itemizedlist>
212                 <listitem><para>
213                 <command>no(default)</command> - ignore the DESC_DACL_PROTECTED flags.
214                 </para></listitem>
215                 <listitem><para>
216                 <command>yes</command> - reject ACLs with DESC_DACL_PROTECTED.
217                 </para></listitem>
218                 </itemizedlist>
219                 </listitem>
221                 </varlistentry>
222                 <varlistentry>
224                 <term>nfs4:mode = [ simple | special ]</term>
225                 <listitem>
226                 <para>
227                 Enable/Disable substitution of special IDs on GPFS. This parameter
228                 should not affect the windows users in anyway. It only ensures that Samba
229                 sets the special IDs - OWNER@ and GROUP@ ( mappings to simple uids )
230                 that are relevant to GPFS.
231                 </para>
233                 <para>The following MODEs are understood by the module:</para>
234                 <itemizedlist>
235                 <listitem><para><command>simple(default)</command> - do not use special IDs in GPFS ACEs</para></listitem>
236                 <listitem><para><command>special</command> - use special IDs in GPFS ACEs. </para> </listitem>
237                 </itemizedlist>
238                 </listitem>
240                 </varlistentry>
243                 <varlistentry>
244                 <term>nfs4:acedup = [dontcare|reject|ignore|merge]</term>
245                 <listitem>
246                 <para>
247                 This parameter configures how Samba handles duplicate ACEs encountered in GPFS ACLs.
248                 GPFS allows/creates duplicate ACE for different bits for same ID.
249                 </para>
251                 <para>Following is the behaviour of Samba for different values :</para>
252                 <itemizedlist>
253                 <listitem><para><command>dontcare (default)</command> - copy the ACEs as they come</para></listitem>
254                 <listitem><para><command>reject</command> - stop operation and exit with error on ACL set op</para></listitem>
255                 <listitem><para><command>ignore</command> - don't include the second matching ACE</para></listitem>
256                 <listitem><para><command>merge</command> - bitwise OR the 2 ace.flag fields and 2 ace.mask fields of the 2 duplicate ACEs into 1 ACE</para></listitem>
257                 </itemizedlist>
258                 </listitem>
259                 </varlistentry>
262                 <varlistentry>
263                 <term>nfs4:chown = [yes|no]</term>
264                 <listitem>
265                 <para>This parameter allows enabling or disabling the chown supported
266                 by the underlying filesystem. This parameter should be enabled with
267                 care as it might leave your system insecure.</para>
268                 <para>Some filesystems allow chown as a) giving b) stealing. It is the latter
269                 that is considered a risk.</para>
271                 <para>Following is the behaviour of Samba for different values : </para>
272                 <itemizedlist>
273                 <listitem><para><command>yes</command> - Enable chown if as supported by the under filesystem</para></listitem>
274                 <listitem><para><command>no (default)</command> - Disable chown</para></listitem>
275                 </itemizedlist>
276                 </listitem>
277                 </varlistentry>
279                 <varlistentry>
280                 <term>gpfs:syncio = [yes|no]</term>
281                 <listitem>
282                 <para>This parameter makes Samba open all files with O_SYNC.
283                   This triggers optimizations in GPFS for workloads that
284                   heavily share files.</para>
286                 <para>Following is the behaviour of Samba for different
287                   values:
288                 </para>
289                 <itemizedlist>
290                 <listitem><para><command>yes</command>Open files with O_SYNC
291                 </para></listitem>
292                 <listitem><para><command>no (default)</command>Open files as
293                     normal Samba would do
294                 </para></listitem>
295                 </itemizedlist>
296                 </listitem>
297                 </varlistentry>
299         </variablelist>
300 </refsect1>
302 <refsect1>
303         <title>EXAMPLES</title>
305         <para>A GPFS mount can be exported via Samba as follows :</para>
307 <programlisting>
308         <smbconfsection name="[samba_gpfs_share]"/>
309         <smbconfoption name="vfs objects">gpfs</smbconfoption>
310         <smbconfoption name="path">/test/gpfs_mount</smbconfoption>
311         <smbconfoption name="nfs4: mode">special</smbconfoption>
312         <smbconfoption name="nfs4: acedup">merge</smbconfoption>
313 </programlisting>
314 </refsect1>
316 <refsect1>
317         <title>CAVEATS</title>
318         <para>
319         Depending on the version of gpfs, the <command>libgpfs_gpl</command>
320         library or the <command>libgpfs</command> library is needed at
321         runtime by the <command>gpfs</command> VFS module:
322         Starting with gpfs 3.2.1 PTF8, the complete <command>libgpfs</command>
323         is available as open source and <command>libgpfs_gpl</command> does no
324         longer exist. With earlier versions of gpfs, only the
325         <command>libgpfs_gpl</command> library was open source and could be
326         used at run time.
327         </para>
328         <para>
329         At build time, only the header file <command>gpfs_gpl.h</command>
330         is required , which is a symlink to <command>gpfs.h</command> in
331         gpfs versions newer than 3.2.1 PTF8.
332         </para>
333 </refsect1>
335 <refsect1>
336         <title>VERSION</title>
337         <para>This man page is correct for version 3.0.25 of the Samba suite.
338         </para>
339 </refsect1>
341 <refsect1>
342         <title>AUTHOR</title>
344         <para>The original Samba software and related utilities
345         were created by Andrew Tridgell. Samba is now developed
346         by the Samba Team as an Open Source project similar
347         to the way the Linux kernel is developed.</para>
349         <para>The GPFS VFS module was created with contributions from
350         Volker Lendecke and the developers at IBM.
351         </para>
353         <para> This manpage was created by the IBM FSCC team </para>
354 </refsect1>
356 </refentry>