VDI_IO_ERROR Continuous Replication on clean install.

olivierlambert

You can, it's still another test that might help us to pinpoint something

yomono

@olivierlambert I would like to add that after this recap I realized... I also had to reinstall XCP so in my case it's also a fresh 8.2.1 install! At least. knowing that, I can do a 8.2.0 + upgrade installation.. (that's what I used to have). I can also try 8.3 alpha, it's not like I have anything to lose at this point (that server is only to contain XO, there is nothing else there)
Anyways.. the fresh 8.2.1 install is definitely the common point here

olivierlambert

Also with iSCSI storage, right?

yomono

@olivierlambert not really. This time is just local ext storage, SATA drives.

olivierlambert

In LVM or thin? It might be 2 different problems, so I'm trying to sort this out.

yomono

@olivierlambert both! I have both mixed in my servers and I tried in both when I did the tests

Tristis Oris

just remember i have one server with fresh 8.2.1 and nfs backups to TrueNAS. it working.
will do other tests tomorrow.

Tristis Oris

@olivierlambert
sr_not_supported that not a error and not a reason. That because of default multipath Dell config for 3xxx series. Persist at 8.2.0 where CR working, so that just a warning.
As we have no any problems before, we never investigate to this setting. My bad again yay.

Replaced it to official for 4xxx and this warning gone. I see at 8.3 it already more universal for any generation.

        device {
                vendor "DellEMC"
                product "ME4"
                path_grouping_policy "group_by_prio"
                path_checker "tur"
                hardware_handler "1 alua"
                prio "alua"
                failback immediate
                path_selector "service-time 0"
        }

since it no default config for huawei, so we always used the official one.

        device {
                vendor                  "HUAWEI"
                product                 "XSG1"
                path_grouping_policy multibus
                path_checker            tur
                prio                    const
                path_selector           "round-robin 0"
                failback                immediate
                fast_io_fail_tmo        5
                dev_loss_tmo            30
        }

8.2.1:
CR not working:
both huawei, dell iscsi - multipath enabled
both huawei, dell iscsi - multipath disabled
working:
nfs vm disk
local thin\ext
local thick\lvm
8.3
working:
both huawei, dell iscsi - multipath enabled
local thick\lvm

and now interesting. After i solved this false warning, detach extra hosts from pool, detach all additional links (trunk, backup) to decrease comunications and log itself - it's no any SMlog generated during backup task.

MP enabled - with 2nd link for backup https://pastebin.com/URcnDckR
MP enabled - only Mng link, no SMlog generated https://pastebin.com/RHw40uzg

olivierlambert

I have the impression it's good news, but I'm not 100% sure to get it, can you rephrase a bit your conclusion?

Tristis Oris

if i have no smlog - xen\dom0 not related with backup task. right?
smlog that usualy i got during this 5min have no any errors anyway, only some locking operations.
And it always takes 5min, some hardcoded timings?

don't forget that problem also happens with FC connection, so it may concern any block based storage types.

olivierlambert

I don't understand your sentence, can you take time to re-read it or rephrase it, because I doesn't make sense to me, sorry

What do you mean by "if i have no smlog - xen\dom0 not related with backup task. right?"?

Tristis Oris

i mean it could be XO issue, since it not communicate with xen. Otherwise it should write some logs.

olivierlambert

I don't see the logical connection with XO, since it works on some SR and not on others. XO has no idea (or doesn't care) about the underlying storage.

Tristis Oris

well, i'm just made some tests and got some result. Have no idea how it should work)

Tristis Oris

i don't understand what happens.
Reinstalled xen to 8.2.0, CR was succeed for few times, but now i got this error again.

Tried few tests - 2-3 fails in row then it succeed again.
Only way to never use this pool for CR.

EddieCh08666741

I also have some fresh installation 8.2.1 with similar error at 5 mins 2seconds 5 min 1 sec

yomono

On my side, yesterday I did the only test I haven't done so far: Installing XenOrchestra in a NON xcp-ng server.
Basically, since always, I had a separated XCP-NG server with just a single VM inside: The XO VM (Just in case, that VM was Ubuntu, Centos, Debian over time, so the base OS has nothing to do with this).
My solution for this was simple: Bare metal Linux. So the problem wasn't the XCP version on the source server, nor the destination server. It was the host server of the XO VM itself
Why? I have no idea, but it's definitely working now since I started a CR task yesterday, of a 1TB VM, with a destination server over internet, and is still exporting after 14 hours without any issues:

yomono

@yomono And to clarify, for this XO host, I tested 8.2.0, 8.2.1, and 8.3.0 fresh installs and all failed at exactly 5 minutes

olivierlambert

This means your Node version was still using the default timeout.

yomono

@olivierlambert when you say "node" you mean node.js? How that timeout can be changed? Thanks