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<p>I don't think you use the --servicenode option when formatting an
mgs-only disk, or the --fsname option. Neither of those apply for
an mgs-only with multiple filesystems.<br>
</p>
<p>My command for a zfs backed mgs was:</p>
<p><i><b>mkfs.lustre --mgs --backfstype=zfs MGT/mgt</b></i><br>
</p>
<p>Then I created 2 different sets of OSTs/MDTs with different
fsnames, but the same mgsnode.</p>
<p>Brian Andrus<br>
</p>
<br>
<div class="moz-cite-prefix">On 11/1/2017 6:50 PM, Parag Khuraswar
wrote:<br>
</div>
<blockquote type="cite"
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<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Raj,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D">But
I have two file system. And I think one mgt can be used for
two filesystems. Correct me if I am wrong.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Parag<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Raj [<a class="moz-txt-link-freetext" href="mailto:rajgautam@gmail.com">mailto:rajgautam@gmail.com</a>] <br>
<b>Sent:</b> Wednesday, November , 2017 4:57 PM<br>
<b>To:</b> Parag Khuraswar; Lustre discussion<br>
<b>Subject:</b> Re: [lustre-discuss] mdt mounting error<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">The following can contribute to this
issue:<o:p></o:p></p>
<div>
<p class="MsoNormal">- Missing FS name in mgt creation (it
must be <=9 character long): --fsname=<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D">mkfs.lustre
<a href="mailto:--servicenode=10.2.1.204@o2ib"
moz-do-not-send="true">--servicenode=10.2.1.204@o2ib</a>
<a href="mailto:--servicenode=10.2.1.205@o2ib"
moz-do-not-send="true">--servicenode=10.2.1.205@o2ib</a>
<b>--fsname=home</b> --mgs /dev/mapper/mpathc</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:13.5pt;font-family:"Calibri","sans-serif"">-
verify if /mdt directory exists</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Wed, Nov 1, 2017 at 6:16 AM Raj <<a
href="mailto:rajgautam@gmail.com" moz-do-not-send="true">rajgautam@gmail.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<p class="MsoNormal">What options in mkfs.lustre did you use
to format with lustre?<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal">On Wed, Nov 1, 2017 at 6:14 AM
Parag Khuraswar <<a
href="mailto:parag_k@citilindia.com" target="_blank"
moz-do-not-send="true">parag_k@citilindia.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Raj,</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Yes,
/dev/mapper/mpatha available. </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
could format and mount using ext4.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Regards,</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Calibri","sans-serif";color:#1F497D">Parag</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Raj [mailto:<a href="mailto:rajgautam@gmail.com"
target="_blank" moz-do-not-send="true">rajgautam@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, November , 2017 4:39 PM<br>
<b>To:</b> Parag Khuraswar; Lustre discussion<br>
<b>Subject:</b> Re: [lustre-discuss] mdt
mounting error</span><o:p></o:p></p>
</div>
</div>
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Parag,
<br>
Is the device /dev/mapper/mpatha available? <br>
If not, the multipathd may not have started or the
multipath configuration may not be correct. <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On
Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar
<<a href="mailto:parag_k@citilindia.com"
target="_blank" moz-do-not-send="true">parag_k@citilindia.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid
#CCCCCC 1.0pt;padding:0in 0in 0in
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<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91">Hi,</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91">I
am getting below error while mounting
mdt. Mgt is mounted. </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91">Please
suggest</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91">[root@mds2
~]# mount -t lustre /dev/mapper/mpatha
/mdt</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91">mount.lustre:
mount /dev/mapper/mpatha at /mdt failed:
No such file or directory</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91">Is
the MGS specification correct?</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91">Is
the filesystem name correct?</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91">If
upgrading, is the copied client log
valid? (see upgrade docs)</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:14.0pt;color:#365F91"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:#365F91">Regards,</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:#365F91">Parag</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="color:#365F91"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">_______________________________________________<br>
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href="mailto:lustre-discuss@lists.lustre.org"
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href="http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org"
target="_blank" moz-do-not-send="true">http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org</a><o:p></o:p></p>
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