Long backup times via NFS to Data Domain from Xen Orchestra

MajorP93

@florent said in Long backup times via NFS to Data Domain from Xen Orchestra:

@MajorP93
interesting, Note that this is orthogonal to NBD.
I note that there is probably more work to do to improve the performance and will retest VM with a lot of disk
Performance is really depending on the underlying storage.
compression and encryption can't be done in "legacy mode" , since we won't be able to merge block in place in this case.

I see thanks for the insights.
The problem that we saw could also be solved if you guys would add another config parameter to the delta backup job: disk concurrency per VM.
That way it would be possible to backup only e.g. 2 out of 10 virtual disks at the time.

florent

@MajorP93 this settings exists (not in the ui )

you can create a configuration file named /etc/xo-server/config.diskConcurrency.toml if you use a xoa

containing

[backups]
diskPerVmConcurrency = 2

Forza

@florent said in Long backup times via NFS to Data Domain from Xen Orchestra:

@MajorP93 this settings exists (not in the ui )

you can create a configuration file named /etc/xo-server/config.diskConcurrency.toml if you use a xoa

containing
[backups]
diskPerVmConcurrency = 2

That is great. Can we get it as a UI option too?

Pilow

@florent what if we use XO Proxies ?

MajorP93

@florent said in Long backup times via NFS to Data Domain from Xen Orchestra:

@MajorP93 this settings exists (not in the ui )

you can create a configuration file named /etc/xo-server/config.diskConcurrency.toml if you use a xoa

containing
[backups]
diskPerVmConcurrency = 2

Hey, does this also work for XO from sources users?

It would be great indeed if there was an UI option for this.

best regards

florent

@Pilow said in Long backup times via NFS to Data Domain from Xen Orchestra:

@florent what if we use XO Proxies ?

te the conf should be on the proxy is /etc/xo-proxy/

florent

@MajorP93 the config should be in ~/.config/xo-server/ of the user running xo-server

It is noted

MajorP93

@florent said in Long backup times via NFS to Data Domain from Xen Orchestra:

@MajorP93 the config should be in ~/.config/xo-server/ of the user running xo-server

It is noted

Thanks.

I tried what you said and placed the "config.diskConcurrency.toml" in "~/.config/xo-server/".

However my XO instance seems to not pick up the config. For VMs that have a lot of disks still all disks are being backed up at the same time. (E.g. 9 disks at the same time instead of the 2 defined in the config file).

root@2d4da229555e:~/.config/xo-server# pwd
/root/.config/xo-server
root@2d4da229555e:~/.config/xo-server# ls -alh
total 16K
drwxr-xr-x 2 root root 4.0K Nov 18 10:36 .
drwxr-xr-x 3 root root 4.0K Nov 17 09:03 ..
-rw-r--r-- 1 root root   35 Nov 18 10:36 config.diskConcurrency.toml
-rw------- 1 root root   72 Nov 17 09:03 config.z-auto.json
root@2d4da229555e:~/.config/xo-server# cat config.diskConcurrency.toml 
[backups]
diskPerVmConcurrency = 2

@florent is it also possible to append the [backups] section with the option you specified to the main config.toml file?

tmk

@florent
Sorry for the late reply, yes, we had previously tried that setting and found that it did not provide any speed increase in our case. One thing to note is that we do have our backup jobs configured to merge backups synchronously, we're starting to test some of our jobs with that setting disabled.

We had originally turned it on because we experienced a lot of backup failures due to locking errors. We've since added additional proxies as we've found that the amount of data that a single proxy can backup in a nightly window was the primary bottleneck in our environment.

Since adding the additional proxies we've started disabling the synchronous backup merge for several of our jobs and so far it has been working pretty well and our backup times have been running faster (obviously since the final merge was the vast majority of the time that we observed in our backup steps).

MajorP93

Hey,
small update:
while adding the backup section and "diskPerVmConcurrency" option to "/etc/xo-server/config.diskConcurrency.toml" or "~/.config/xo-server/config.diskConcurrency.toml" had no effect for me, I was able to get this working by adding it at the end of my main XO config file at "/etc/xo-server/config.toml".

Best regards

florent

@MajorP93 that's nice to hear taht it, at least solved the issue
are you using a xoa ? or a compiled fro source ?
what is the user that run the xo service ?