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Hi,</div>
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My initial copy from old lustre to new lustre was with rsync, using this syntax:</div>
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SOURCE="/lustre/workgroups" DEST="${SOURCE#/lustre/}" && find "$SOURCE" -maxdepth 1 -mindepth 1 -type d | xargs -t -n1 -P6 -I% rsync -aPA --delete-during % "/mnt/lustre_new/$DEST"</div>
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I do indeed need to copy the linux ACL's</div>
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But when debugging the issue, I used files without any extended attributes, from other filesystems than lustre.</div>
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Just enabling DoM with "lfs setstripe -E 1M -L mdt -E -1 -c 1 /mnt/lustre_new/dom" will disable compression on the OST's. (dom_stripesize is set to 1048576)</div>
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I'm thinking about trying 2.15.1 on the new servers...</div>
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Regards,</div>
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Martin Balvers</div>
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<b>From:</b> Vicker, Darby J. (JSC-EG111)[Jacobs Technology, Inc.] <darby.vicker-1@nasa.gov><br>
<b>Sent:</b> Monday, July 28, 2025 16:57<br>
<b>To:</b> BALVERS Martin <Martin.BALVERS@danone.com>; lustre-discuss <lustre-discuss@lists.lustre.org><br>
<b>Subject:</b> Re: [EXTERNAL] [BULK] [lustre-discuss] No ZFS compression on OST's when using PFL
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<div style="line-height: 1; font-size: 11px;"><b>WARNING - EXTERNAL SENDER - BE CYBERSAFE</b></div>
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<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt;">I’m not sure if this is related to your problem but you need to be careful when copying data between two lustre filesystems. If you use something that copies
the extended attributes (e.g. rsync -X), you can copy the lustre xattrs, which is probably not what you want. This will override the PFL you have on the new lustre FS. You can either not copy the extended attributes (which isn’t a great option if you are
using ACL’s or other xattrs) or use a lustre-aware tool like mpifileutils. </span></p>
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<span style="font-size: 12pt; color: black;"><b>From: </b>lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of BALVERS Martin via lustre-discuss <lustre-discuss@lists.lustre.org><br>
<b>Date: </b>Friday, July 25, 2025 at 7:07</span><span style="font-family: Arial, sans-serif; font-size: 12pt; color: black;"> </span><span style="font-size: 12pt; color: black;">AM<br>
<b>To: </b>lustre-discuss <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>[EXTERNAL] [BULK] [lustre-discuss] No ZFS compression on OST's when using PFL</span></p>
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</span><span style="color: black;">This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC.</span></p>
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<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">Hi,</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">I am using a lustre 2.15.1 cluster with PFL. I'm using the following layout:</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">lfs setstripe -E 1M -L mdt -E 128M -c 1 -S 4M -E 2G -c 2 -z 64M -E -1 -c -1 -z 256M /lustre</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">OST's have zpools with zstd compression enabled.</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">This has worked fine for me for many years.</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">I now have new servers and installed 2.16.1 on them. I used the same PFL layout, and after some benchmarking I proceeded to copy data from
the old lustre to the new.</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">After a while I noticed that it was filling up faster that expected, and say that the compression ratio on the zpools was 1.</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">Compression on the zpools is enabled, it should have worked as far as I can tell.</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">When I disable PFL, compression works as expected.</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">I have attached the some results in a txt file.</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">I have also tried 2.15.7 with the same results. Enabling PFL, or just DoM disables compression on the OST's.</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">Am I missing something obvious here? </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">Regards,</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 10pt;"><span style="font-size: 11pt; color: black;">Martin Balvers</span></p>
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