Hi,

since we have updated to 4.3.7 and another cluster to 4.3.8 snapshots
are not longer possible. In previous version all went well...

° libGfApi enabled
° gluster 6.7.1 on gluster-server and client
° libvirt-4.5.0-23.el7_7.3

vdsm on a given node says:

jsonrpc/2) [vds] prepared volume path:
gluvol3/e54d835a-d8a5-44ae-8e17-fcba1c54e46f/images/1f43916a-bbf2-447b-b17d-ba22d4ec8c90/0e56d498-11d2-4f35-b781-a2e06d286eb8
(clientIF:510)

(jsonrpc/2) [virt.vm] (vmId='acdc31b5-082b-4a68-b586-02354a7fdd73')
<?xml version='1.0' encoding='utf-8'?>
<domainsnapshot><disks><disk name="sda" snapshot="external"
type="network"><source
name="gluvol3/e54d835a-d8a5-44ae-8e17-fcba1c54e46f/images/1f43916a-bbf2-447b-b17d-ba22d4ec8c90/0e56d498-11d2-4f35-b781-a2e06d286eb8"
protocol="gluster" type="network"><host name="192.168.1
1.20" port="0" transport="tcp"
/></source></disk></disks></domainsnapshot> (vm:4497)

(jsonrpc/2) [virt.vm] (vmId='acdc31b5-082b-4a68-b586-02354a7fdd73')
Disabling drive monitoring (drivemonitor:60)

(jsonrpc/2) [virt.vm] (vmId='acdc31b5-082b-4a68-b586-02354a7fdd73')
Freezing guest filesystems (vm:4268)
WARN  (jsonrpc/2) [virt.vm]
(vmId='acdc31b5-082b-4a68-b586-02354a7fdd73') Unable to freeze guest
filesystems: Guest agent is not responding: QEMU guest agent is not
connected (vm:4273)
INFO  (jsonrpc/2) [virt.vm]
(vmId='acdc31b5-082b-4a68-b586-02354a7fdd73') Taking a live snapshot
(drives=sda, memory=True) (vm:4513)
...
...

ERROR (jsonrpc/2) [virt.vm]
(vmId='acdc31b5-082b-4a68-b586-02354a7fdd73') Unable to take snapshot
(vm:4517)
Traceback (most recent call last):
   File "/usr/lib/python2.7/site-packages/vdsm/virt/vm.py", line 4514,
in snapshot
     self._dom.snapshotCreateXML(snapxml, snapFlags)
   File "/usr/lib/python2.7/site-packages/vdsm/virt/virdomain.py", line
100, in f
     ret = attr(*args, **kwargs)
   File
"/usr/lib/python2.7/site-packages/vdsm/common/libvirtconnection.py",
line 131, in wrapper
     ret = f(*args, **kwargs)
   File "/usr/lib/python2.7/site-packages/vdsm/common/function.py", line
94, in wrapper
     return func(inst, *args, **kwargs)
   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 2620, in
snapshotCreateXML
     if ret is None:raise libvirtError('virDomainSnapshotCreateXML()
failed', dom=self)
libvirtError: internal error: unable to execute QEMU command
'transaction': Could not read L1 table: Input/output error
...
INFO  (jsonrpc/2) [jsonrpc.JsonRpcServer] RPC call VM.snapshot failed
(error 48) in 4.65 seconds (__init__:312)

It seems that the origin is libvirt or qemu.

Regards
Chris
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