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On Sep 26, 2023, at 06:12, Jan Andersen <<a href="mailto:jan@comind.io" class="">jan@comind.io</a>> wrote:<br class="">
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<div class="">Hi,<br class="">
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I've built and installed lustre on two VirtualBoxes running Rocky 8.8 and formatted one as the MGS/MDS and the other as OSS, following a presentation from Oak Ridge National Laboratory: "Creating a Lustre Test System from Source with Virtual Machines" (sorry,
no link; it was a while ago I downloaded them).<br class="">
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There are a number of such resources linked from the <a href="https://wiki.lustre.org/" class="">https://wiki.lustre.org/</a> front page.</div>
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<div class="">I can mount the filesystems on the MDS, but when I try from the OSS, it just times out - from dmesg:<br class="">
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[root@oss1 log]# dmesg | grep -i lustre<br class="">
[ 564.028680] Lustre: Lustre: Build Version: 2.15.58_42_ga54a206<br class="">
[ 625.567672] LustreError: 15f-b: lustre-OST0000: cannot register this server with the MGS: rc = -110. Is the MGS running?<br class="">
[ 625.567767] LustreError: 1789:0:(tgt_mount.c:2216:server_fill_super()) Unable to start targets: -110<br class="">
[ 625.567851] LustreError: 1789:0:(tgt_mount.c:1752:server_put_super()) no obd lustre-OST0000<br class="">
[ 625.567894] LustreError: 1789:0:(tgt_mount.c:132:server_deregister_mount()) lustre-OST0000 not registered<br class="">
[ 625.588244] Lustre: server umount lustre-OST0000 complete<br class="">
[ 625.588251] LustreError: 1789:0:(tgt_mount.c:2365:lustre_tgt_fill_super()) Unable to mount (-110)<br class="">
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Both 'nmap' and 'netstat -nap' show that there is nothing listening on port 988:<br class="">
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[root@mds ~]# netstat -nap | grep -i listen<br class="">
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1/systemd<br class="">
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 806/sshd<br class="">
tcp6 0 0 :::111 :::* LISTEN 1/systemd<br class="">
tcp6 0 0 :::22 :::* LISTEN 806/sshd<br class="">
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What should be listening on 988?<br class="">
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<div>The MGS should be listening on port 988, running on the "mgsnode" that was specified at format time for the OSTs and MDTs.</div>
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<div>It is possible to have the MGS and MDS share the same storage device for simple configurations, but in production they are usually running on separate devices so they can be started/stopped independently, even if they are running on the same server.</div>
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<div>Cheers, Andreas</div>
<div>--</div>
<div>Andreas Dilger</div>
<div>Lustre Principal Architect</div>
<div>Whamcloud</div>
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