Large VM Migration fails, host has free disk - Storage_error

ditzy-olive

I am trying to migrate a rather large vm 1.6T of disks in total.
It runs for 15 Hours and then fails with There is insufficient space
The target xcp-ng however has 3.09TB of disk free so I am a bit confused where the insufficient space is coming from.
They hosts are running XCP-ng 8.2.1, other VM could be migrated without issue but struggling with this large one.
I could potentially start splitting the services from the VM into smaller VM which wouldn't be a bad idea anyway, but still would like to understand how to debug this.

"(((process xapi)(filename ocaml/xapi/xapi_vm_migrate.ml)(line 1564))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 131))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/xapi/rbac.ml)(line 205))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 95)))"
message	"INTERNAL_ERROR(Storage_error ([S(Internal_error);S(Storage_error ([S(Internal_error);S(Storage_error ([S(Internal_error);S(Storage_error ([S(Backend_error);[S(SR_BACKEND_FAILURE_44);[S();S(There is insufficient space);S()]]]))]))]))]))"
name	"XapiError"
stack	"XapiError: INTERNAL_ERROR(Storage_error ([S(Internal_error);S(Storage_error ([S(Internal_error);S(Storage_error ([S(Internal_error);S(Storage_error ([S(Backend_error);[S(SR_BACKEND_FAILURE_44);[S();S(There is insufficient space);S()]]]))]))]))]))\n    at Function.wrap (file:///opt/xo/xo-builds/xen-orchestra-202512060836/packages/xen-api/_XapiError.mjs:16:12)\n    at default (file:///opt/xo/xo-builds/xen-orchestra-202512060836/packages/xen-api/_getTaskResult.mjs:13:29)\n    at Xapi._addRecordToCache (file:///opt/xo/xo-builds/xen-orchestra-202512060836/packages/xen-api/index.mjs:1073:24)\n    at file:///opt/xo/xo-builds/xen-orchestra-202512060836/packages/xen-api/index.mjs:1107:14\n    at Array.forEach (<anonymous>)\n    at Xapi._processEvents (file:///opt/xo/xo-builds/xen-orchestra-202512060836/packages/xen-api/index.mjs:1097:12)\n    at Xapi._watchEvents (file:///opt/xo/xo-builds/xen-orchestra-202512060836/packages/xen-api/index.mjs:1270:14)

Pilow

@ditzy-olive Hi,

What are the type of SRs (Source and destination ?) NFS . iSCSI ? local or shared ?
What is the free space on both, before launching the migration ?