<![CDATA[Migration compression is not available on this pool]]>I cannot enable the Migration Compression on my pool of two 8.3 XCP-ng hosts. The X_O UI says "Migration compression is not available on this pool". Any ideas what could be the reason and how to make it work?

]]>https://xcp-ng.org/forum/topic/11130/migration-compression-is-not-available-on-this-poolRSS for NodeWed, 07 Oct 2026 22:04:57 GMTFri, 01 Aug 2025 23:59:27 GMT60<![CDATA[Reply to Migration compression is not available on this pool on Sun, 03 Aug 2025 22:08:08 GMT]]>Hello,

We tried the compression feature.

You "can see" a benefit only if you have a shared storage. ( and again, the migration between 2 nodes is already very fast, we don't see major difference, but maybe a VM will a lot of ram ( >32GB ) can see a difference.

If you don't have a shared storage ( like XOSTOR, NFS, ISCSI ), then you will not see any difference because there is a limitation of 30MB/s-40MB/s ( see here: https://xcp-ng.org/forum/topic/9389/backup-migration-performance )

Best regards,

]]>https://xcp-ng.org/forum/post/95938https://xcp-ng.org/forum/post/95938Sun, 03 Aug 2025 22:08:08 GMT<![CDATA[Reply to Migration compression is not available on this pool on Sun, 03 Aug 2025 20:15:31 GMT]]>Hard to tell, but I never really understood why it was a priority at XenServer. But the product person pushing for this feature is not longer in that position, so we'll never know.

]]>https://xcp-ng.org/forum/post/95936https://xcp-ng.org/forum/post/95936Sun, 03 Aug 2025 20:15:31 GMT<![CDATA[Reply to Migration compression is not available on this pool on Sun, 03 Aug 2025 19:59:30 GMT]]>@olivierlambert like what ballpark? I used it on 1Gbps.

]]>https://xcp-ng.org/forum/post/95935https://xcp-ng.org/forum/post/95935Sun, 03 Aug 2025 19:59:30 GMT<![CDATA[Reply to Migration compression is not available on this pool on Sun, 03 Aug 2025 12:18:02 GMT]]>I'm not sure that feature can provide a visible difference in most context, only if you have a very small bandwidth.

]]>https://xcp-ng.org/forum/post/95934https://xcp-ng.org/forum/post/95934Sun, 03 Aug 2025 12:18:02 GMT<![CDATA[Reply to Migration compression is not available on this pool on Sat, 02 Aug 2025 22:49:40 GMT]]>@olivierlambert said in Migration compression is not available on this pool:

So just to recap, setting it via xe works out of the box right?

Correct.

And now it works again (the toggle in XO) but doesn't change the config when checking via xe ?

No. Toggeling on the UI is also reflected correctly by checking via xe.

After some testing however, no performance difference could be measured between Migration Compression being enabled or disabled.

]]>https://xcp-ng.org/forum/post/95932https://xcp-ng.org/forum/post/95932Sat, 02 Aug 2025 22:49:40 GMT<![CDATA[Reply to Migration compression is not available on this pool on Sat, 02 Aug 2025 10:20:59 GMT]]>So just to recap, setting it via xe works out of the box right?

And now it works again (the toggle in XO) but doesn't change the config when checking via xe ?

]]>https://xcp-ng.org/forum/post/95927https://xcp-ng.org/forum/post/95927Sat, 02 Aug 2025 10:20:59 GMT<![CDATA[Reply to Migration compression is not available on this pool on Sat, 02 Aug 2025 10:20:37 GMT]]>@olivierlambert there was nothing in the log. I tried setting it per the xe command and using xe I could see that it is on or off, but XO did not show these changes on the UI.

what helped was restarting XO. since then I can toggle it and xe shows the same status.

]]>https://xcp-ng.org/forum/post/95926https://xcp-ng.org/forum/post/95926Sat, 02 Aug 2025 10:20:37 GMT<![CDATA[Reply to Migration compression is not available on this pool on Sat, 02 Aug 2025 09:49:46 GMT]]>Do you have more detailed logs about it?

]]>https://xcp-ng.org/forum/post/95925https://xcp-ng.org/forum/post/95925Sat, 02 Aug 2025 09:49:46 GMT