Updated XOA with kernel >5.3 to support nconnect nfs option

[olivierlambert]

Hi @acomav

Can you give more details on your setup and the result before/after? We might use this to update our XO guide with the new values

[acomav]

@olivierlambert Hi Olivier. I'll see what I can do. I've spent the weekend cleaning up my backups and catching up on mirror transfers. Once completed, I'll do a few custom backups at various nconnect values.

[florent]

@Forza said in Updated XOA with kernel >5.3 to support nconnect nfs option:

@florent hi, for the full backup test above, I used normal mode with zstd enabled. There were no snapshots of the source VM and it was stored on local ssd storage on the pool master.

can you test a backup on an empty remote with block mode ?

[manilx]

@florent Did a test on my 8.3 homelab.
Using XO on a Debian 12 VM.

2 full (delta) backups using "nconnect=6" of all my 10 VM's

With block defined at remote:

without block (my normal mode):

[olivierlambert]

I'm not sure to get it with your graph. Can you write down the average values for each scenario?

[manilx]

@olivierlambert

with block: 100-150 MB/s approx
without: 200-300 MB/s

Values from observed NAS traffic.

[Forza]

@manilx Do you mean block as NBD mode?

[manilx]

@Forza Did another test:

A: Remote as nfs share with "Store backup as multiple data blocks"
B: same but without multiple data blocks

1st backup to A,"Backup"

2nd backup to B, "Backup"

3rd backup to A, "Backup"

4th backup to B, "Delta Backup"

[manilx]

@manilx This was just one VM. Did not use NBD (forgot to turn on)

[olivierlambert]

I'm a bit confused, you are comparing block based vs VHD, but did you also change the nconnect option between run or kept it to a specific number? (in case, which one)

[manilx]

@olivierlambert allbackups done with nfs option "nconnect=6"

[manilx]

@manilx 2 more and yes seems to be confusing and just to round it up.

Same VM as above

Delta (full) backup using NBD without and with "nconnect=6" in the remote setting:

with nconnect=6

nconnect=6 doesn't seem to do a lot.