slow pbs when backed-up vm is on cifs share

RolandK

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Mar 5, 2019
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i have some powered-off VMs which are located on a cifs share. i use those for "parking" unused VMs.

i have observed, when these VMs are getting backed up with pbs, performance is terribly slow. (<< 500Kb/s).

migrating the virtual disks from/to the cifs share is fast (100Mb/s).

what is the reason for the slow pbs backup speed?