Posts made by _danielgurgel

@GHW I agree ... they failed to apply the same level of reliability during live migration as VMWare has ...

Before applying the patch, in a new pool (during the CH8 update process to XCP8), when moving any VM to the updated host I received the error below.

After installing the patch on the master host and restarting the toolstack on the host master and the source host, we no longer notice error, with the migrate process successfully completing.

The error condition was the failed shutdown of the VM in the live migrate process. So I think the patch made available actually solves the problem in question. (for VMs with and without network interfaces)

Nov 30 12:54:48 SECH82 xapi: [error|SECH82|946189 ||backtrace] Async.VM.pool_migrate R:29b4b31d74de failed with exception Server_error(INTERNAL_ERROR, [ xenopsd internal error: Device_common.QMP_Error(135, "{\"error\":{\"class\":\"GenericError\",\"desc\":\"Unable to open /dev/fdset/0: No such file or directory\",\"data\":{}},\"id\":\"qmp-000029-135\"}") ])
Nov 30 12:54:48 SECH82 xapi: [error|SECH82|946189 ||backtrace] Raised Server_error(INTERNAL_ERROR, [ xenopsd internal error: Device_common.QMP_Error(135, "{\"error\":{\"class\":\"GenericError\",\"desc\":\"Unable to open /dev/fdset/0: No such file or directory\",\"data\":{}},\"id\":\"qmp-000029-135\"}") ])
Nov 30 12:54:48 SECH82 xapi: [error|SECH82|946189 ||backtrace] 1/1 xapi @ SECH82 Raised at file (Thread 946189 has no backtrace table. Was with_backtraces called?, line 0
Nov 30 12:54:48 SECH82 xapi: [error|SECH82|946189 ||backtrace]

@stormi it seems to be the same problem.

Sorry, it may have been the "placebo effect" but after applying the update we no longer had the error when making the migrate.

I'm going to continue the tests... and with VMs without network card, as described in the link.

@stormi After applying the new patch, migrations are no longer failing. We just tested on a new cluster with 20 servers.

Thank you so much for your help.
This patch be including as official update?

@olivierlambert Yes, all VMs have ejected CD.

@stormi said in FIX to XCP-ng:

cleaning up VM stat

Yes, I received the error, see below:

xensource.log:Nov 27 08:20:32 SECH82 xenopsd-xc: [debug|SECH82|24 |Async.VM.pool_migrate R:8472b9c00966|xenops_server] Caught Xenops_interface.Xenopsd_error([S(Storage_backend_error);[S(SR_BACKEND_FAILURE_46);[S();S(The VDI is not available [opterr=VDI e3222f55-10ce-4d85-b6a8-a7c81f1a5a1d not detached cleanly]);S()]]]): cleaning up VM state

[10:14 SECH82 log]# cat /etc/xensource-inventory
PRIMARY_DISK='/dev/disk/by-id/scsi-36d0946606f4911002317966d118d6a4f'
DOM0_VCPUS='16'
PRODUCT_VERSION='8.0.0'
DOM0_MEM='8192'
CONTROL_DOMAIN_UUID='8320160d-3a65-4051-8d55-2e619ad4875f'
MANAGEMENT_ADDRESS_TYPE='IPv4'
COMPANY_NAME_SHORT='Open Source'
PARTITION_LAYOUT='ROOT,BACKUP,LOG,BOOT,SWAP,SR'
PRODUCT_VERSION_TEXT='8.0'
INSTALLATION_UUID='a394d22c-94a9-4e83-89c0-fd366b191216'
PRODUCT_BRAND='XCP-ng'
BRAND_CONSOLE='XCP-ng Center'
PRODUCT_VERSION_TEXT_SHORT='8.0'
MANAGEMENT_INTERFACE='xenbr2'
PRODUCT_NAME='xenenterprise'
STUNNEL_LEGACY='true'
BUILD_NUMBER='release/naples/master/45'
PLATFORM_VERSION='3.0.0'
COMPANY_PRODUCT_BRAND='XCP-ng'
PLATFORM_NAME='XCP'
BACKUP_PARTITION='/dev/disk/by-id/scsi-36d0946606f4911002317966d118d6a4f-part2'
BRAND_CONSOLE_URL='https://xcp-ng.org'
INSTALLATION_DATE='2019-11-27 01:22:15.630698'
COMPANY_NAME='Open Source'

@stormi Described in CA-327906

I think it's i'm going through this problem. we are migrating from CH8 to XCP and during migrate, I have noticed failure in the process (migre stalled at 100% and does not conclude) or unexpected shutdown occurs in virtual server.

Does this bug affect migrate after a pool is 100% updated with XCP8 (with all updates applied)?

Is it possible to apply this fix also in XCP-ng 8?

Live migration, storage live migration, and VDI migration can fail for VMs that have no attached
VIFs. After this failure, the VM hangs in shutdown mode. (CA-327906)

https://github.com/xapi-project/xenopsd/commit/8c3756b952476ff82f9bcbb9ab11ea027bc5ccbb

0 edwintorok committed to xapi-project/xenopsd

CA-327906: don't fail migration if a xenstore directory is missing

Migration of a VM without VIFs got stuck at:
```
Caught Xs_protocol.Enoent("directory"): cleaning up VM stat
```

Some more debugging showed it failed when trying to move this xenstore
entry, which was missing:
```
/xapi/8e8c58cd-eba4-cde3-e1e5-000000000001
```

The intention of this code seems to have been to ignore missing entries,
so do that by ignoring Enoent on the root of a tree.
Do not ignore Enoent on entries deep in the tree since that would
indicate a race condition elsewhere.

Signed-off-by: Edwin Török <edvin.torok@citrix.com>

@stormi After the informed change, the backup occurred with 100% success, on no disk in the coalesce chain.

We're migrating another cluster to XCP-ng 8!
Thanks for the support, quick return and attention.

@stormi The strange thing is, I had to turn off the VMs, rescan disk and then turn on again.

The coalesce process began with the linked VMs (in production) and successfully completed. The following values have been changed at /opt/xensource/sm/cleanup.py :

LIVE_LEAF_COALESCE_MAX_SIZE = 1024 * 1024 * 1024 # bytes
LIVE_LEAF_COALESCE_TIMEOUT = 300 # seconds

Well, apparently everything ok... we will see in our next backup if it will be necessary to turn off the VMs for the coalesce to start and complete correctly.

@olivierlambert
Notes:
• Dynamic Memory Control is deprecated in Citrix Hypervisor 8.1 and will be removed in a
future release.

See file.. https://gofile.io/?c=xRuFy8 (citrix-hypervisor-8.1.pdf)

@stormi The perception I have is as follows in XCP8:

• After backup, all the disks were left with 1 disk frozen in the leaf tree.
• Even pausing the VM and rescanning disk, the coalesce process does not start.

For CH7.1 with the XS71ECU2020 update, the coalesce process completed 100% by pausing the VMs. We will now re-back it up and see if the coalesce runs again 100%.

I used standard times in LIVE_LEAF_COALESCE_TIMEOUT=10.
The new test will be with LIVE_LEAF_COALESCE_TIMEOUT=300.

I was able to download the PDF with the documentation of 8.1. Happy for Xen 4.13 and WLB integrated with XenCenter...

But I was sad that they didn't evolve with GFS2 and removed DMC.

How strange ... I didn't see any official announcements and they seem to have removed the documentation page for 8.1. I also couldn't find the links to download inside my Citrix account.

@stormi the update actually solves the problem of zombies process, but the coalesce, all disks after backup/snapshot (removal) still continue with a 1 disk stuck in the leaf chain.

I am also testing the update made available in https://support.citrix.com/article/CTX265619 in an XS 7.1 pool.

@stormi Thank you!
I'll be applying and validating the patch.

@olivierlambert raw over iscsi?

@Anonabhar also here...

@olivierlambert Could this patch be the solution?
It would validate if this would really fix the problem.

[XSO-887](https://bugs.xenserver.org/browse/XSO-887?focusedCommentId=17173&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel)