[DRBD-user] 8 Zettabytes out-of-sync?

[Jarno Elonen]

Okay, today one of these resources got a sudden, severe filesystem
corruption on the primary.

On the other hand, the secondaries (that showed 8ZiB out-of-sync) were
still mountable after I disconnected the corrupted primary. No idea how
current data the secondaries had, but drbdtop still showed them as
connected and 8Zib out-of-sync.

This is getting quite worrisome. Is anyone else experiencing this with DRBD
9? Is it something really wrong in my setup, or are there perhaps some
known instabilities in DRBD 9.0.15-1?

-Jarno


On Wed, 31 Oct 2018 at 20:46, Jarno Elonen <elonen at iki.fi> wrote:

> I've got several DRBD 9 resource that constantly show *UpToDate* with
> 9223372036854774304 bytes (exactly 8ZiB) of OutOfDate data.
>
> Any idea what might cause this and how to fix it?
>
> Example:
>
> # drbdsetup status --verbose --statistics vm-106-disk-1
> vm-106-disk-1 node-id:0 role:Primary suspended:no
>     write-ordering:flush
>   volume:0 minor:1003 disk:UpToDate quorum:yes
>       size:16777688 read:215779 written:22369564 al-writes:89 bm-writes:0
> upper-pending:0
>       lower-pending:0 al-suspended:no blocked:no
>   mox-a node-id:1 connection:Connected role:Secondary congested:no
> ap-in-flight:0
>       rs-in-flight:18446744073709549808
>     volume:0 replication:Established peer-disk:UpToDate resync-suspended:no
>         received:215116 sent:22368903 out-of-sync:9223372036854774304
> pending:0 unacked:0
>   mox-c node-id:2 connection:Connected role:Secondary congested:no
> ap-in-flight:0
>       rs-in-flight:18446744073709549808
>     volume:0 replication:Established peer-disk:UpToDate resync-suspended:no
>         received:1188 sent:19884428 out-of-sync:0 pending:0 unacked:0
>
> Version info:
> version: 9.0.15-1 (api:2/proto:86-114)
> GIT-hash: c46d27900f471ea0f5ba587592439a9ddde1d08b build by root at mox-b,
> 2018-10-10 17:50:25
> Transports (api:16): tcp (9.0.15-1)
>
> -Jarno
>
>
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