<![CDATA[NO_HOSTS_AVAILABLE vs Not Enough memory Available]]>I have single XCP-ng host in my pool. It's a small footprint dual core host with 4Gb.
It contains 4 VMs (XO, Home Assistant, Linux Mint and openmediavault).
By default, XOA and HA are running. When I try to start Linux from XO, I'm told NO_HOSTS_AVAILABLE(). If I try to start Linux from xsconsole, I'm told "Not enough memory available."
No two of these VMs will be used in anger at the same time; it would simply be nice to have them all available.

Is there something I can do to get all four of them running?

(I have reduced the number of CPUs used by XO to 1, but in xsconsole, it still show 2 cores in use.)

]]>https://xcp-ng.org/forum/topic/4930/no_hosts_available-vs-not-enough-memory-availableRSS for NodeFri, 09 Oct 2026 04:51:46 GMTTue, 07 Sep 2021 08:50:18 GMT60<![CDATA[Reply to NO_HOSTS_AVAILABLE vs Not Enough memory Available on Tue, 07 Sep 2021 12:05:34 GMT]]>Short answer: yes.

]]>https://xcp-ng.org/forum/post/42078https://xcp-ng.org/forum/post/42078Tue, 07 Sep 2021 12:05:34 GMT<![CDATA[Reply to NO_HOSTS_AVAILABLE vs Not Enough memory Available on Tue, 07 Sep 2021 10:36:26 GMT]]>@olivierlambert Must the RAM be hard-allocated uniquely to each VM?
I'd swear my previous hardware had 2Gb allocated to each of 4 VMs (=8Gb) but it only had 4Gb RAM.

]]>https://xcp-ng.org/forum/post/42074https://xcp-ng.org/forum/post/42074Tue, 07 Sep 2021 10:36:26 GMT<![CDATA[Reply to NO_HOSTS_AVAILABLE vs Not Enough memory Available on Tue, 07 Sep 2021 10:00:40 GMT]]>4GiB on the whole physical machine?

It means you would have 1GiB for the Dom0, so there's 3GiB left roughly.

]]>https://xcp-ng.org/forum/post/42066https://xcp-ng.org/forum/post/42066Tue, 07 Sep 2021 10:00:40 GMT<![CDATA[Reply to NO_HOSTS_AVAILABLE vs Not Enough memory Available on Tue, 07 Sep 2021 09:58:45 GMT]]>@olivierlambert Single host: One computer in the pool. HA: Home Assistant. Probably not relevant, but I can't seem to get the right balance of useful information in support requests!

4Gb RAM and 1Gb reserved for each VM. 2 cores and 1 core reserved for each VM, but I can't run more than 2 VMs.

Thanks!

]]>https://xcp-ng.org/forum/post/42064https://xcp-ng.org/forum/post/42064Tue, 07 Sep 2021 09:58:45 GMT<![CDATA[Reply to NO_HOSTS_AVAILABLE vs Not Enough memory Available on Tue, 07 Sep 2021 09:20:36 GMT]]>Hi,

Single host and HA? 😅 What does it mean?

Also, you can use more vCPU than physical CPUs in total. But for memory, you need to have enough reserved for all your VMs.

]]>https://xcp-ng.org/forum/post/42061https://xcp-ng.org/forum/post/42061Tue, 07 Sep 2021 09:20:36 GMT