[DRBD-user] PingAck did not arrive in time.

[Oleksiy Evin]

We are using this volume for video editing, mainly it's video/audio/photo storage plus some project files replicated twice (previously 3 times). On a physical level single node contains 6x12 bay RAID0 enclosures joined into a logical volume. I've been playing earlier with a different configuration, like setting up a DRBD resource for each enclosure, then join it into a logical volume, but finally decided to go with a single volume due to simplicity despite some loss in replication speed. At this moment we're able to achieve about 1.2GB while replication which is little bit slower then a single enclosure speed, but enough for all our needs. Potentially we may grow up above PB next year or two. Do you advise any different setup?

⁣//OE​

On 24 Jun 2019, 20:17, at 20:17, Lars Ellenberg <lars.ellenberg at linbit.com> wrote:
>On Fri, Jun 21, 2019 at 02:33:08PM +0200, Robert Altnoeder wrote:
>> On 6/21/19 9:16 AM, Oleksiy Evin wrote:
>> > I've tried to update the kernel and DRBD 9 to the last available
>> > version, but nothing helped with the PingAck issue. So I had to
>> > downgrade to DRBD 8.4 which is started to replicate fine
>> > [...]
>> > Can anyone help me on the "PingAck did not arrive in time."
>repeated
>> > error while initial bitmap synchronization?
>> > [...]
>> > I'm using the basic drbd configuration on 527TB LVM volume
>> 
>> This is not generally a version problem, except maybe for the
>> performance side effects of various versions. It's probably actually
>a
>> size problem. Bitmap operations on a 527 TB volume take some time to
>be
>> processed, and some operation probably blocks one of the DRBD kernel
>> threads long enough to cause DRBD to be too slow to answer a DRBD
>PING
>> request from its peer.
>> 
>> There is an option "ping-timeout" (in the "net" section, the value
>being
>> in tenth of a second) that can be adjusted to change the ping
>timeout.
>
>And for various reasons, not least of them, performance considerations,
>using a single DRBD volume of that size is most likely not what you
>want.
>If you really mean it, it will likely require a number of deviations
>from "default" settings to work reasonaly well.
>
>Do you mind sharing with us what you actually want?
>What do you mean to use that volume for?
>
>-- 
>: Lars Ellenberg
>: LINBIT | Keeping the Digital World Running
>: DRBD -- Heartbeat -- Corosync -- Pacemaker
>
>DRBD® and LINBIT® are registered trademarks of LINBIT
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