Performance Issues Comparing VMware

[a.s.nurulin]

We have migrated the PostgreSQL server from VMware to PVE 6.2.
The backup time for all databases in the cluster has increased from 1 hour 15 minutes to 1 hour 50 minutes.
Both hosts run on the same processor, have the same amount of RAM and the same SSD disks.
What could be the problem?

I am very concerned about this turn of affairs, since I believed that VMware and PVE were close in performance and convinced my colleagues of the need to switch to PVE

 

[dietmar]

What image file format do you use? What cache settings? What backup tools do you compare exactly? Is the hardware really exactly (mainboard)?

 

[a.s.nurulin]

Disk images in RAW format, disks transferred without conversion and changes. Archiving goes to a network resource (in both cases).

The archiving script is applied, in which the following line plays the main role:

nice -n 19 ionice -c3 pg_dump -d $DBNAME -h ${SERVERNAME} -p $PORT -U ${USERNAME} -w | pigz > ${ARCHIVEDIR}'/'${DBNAME}'/'${DBNAME}'_'$SUFFIX'.dump.gz';

CPU(s) 32 x AMD Opteron(tm) Processor 6376 (2 Sockets) on both hosts.

 

[a.s.nurulin]

>What cache settings?

VM was created with settings by defaults, no cache

 

[apoc]

Are you using virtio storage controller?
Are you using cpu-type "host" for your VMs?
The default kvm-64 is most compatible but not the fastest - not all instruction sets are available

 

[a.s.nurulin]

>Are you using virtio storage controller?

yes

>Are you using cpu-type "host" for your VMs?

kvm-64

>The default kvm-64 is most compatible but not the fastest - not all instruction sets are available

What cpu do you recommend for AMD Opteron(tm) Processor 6376 ?

 

[apoc]

Just use "host-type" or similar.
It hides somewhere in the list.
Opteron G5 is the 6300 opterons afaik

 

[a.s.nurulin]

tburger and everybody thanks

I was change cpu type to host and got time of archiving less than 1 hour, 15 minutes better