[DRBD-user] Does "drbd verify" send all the device data over the network

Lars Ellenberg lars.ellenberg at linbit.com
Thu Nov 29 08:40:16 CET 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Wed, Nov 28, 2012 at 05:08:09PM -0600, John Anthony wrote:
> Hello All:
> Trying to understand what happens when drbd verify is run against a
> resource.
> My sense was that only the digest is generated and sent over for
> validation. And if the validation fails the particular page is marked as
> dirty.
>  But looking at the "speed" info and and "finish" time - the calculation
> seems to indicate that all the data of the device is sent over.
> what am I missing ?

All the device needs to be *read* to calculate the checksums.
On both sides of the connection.

So yes, the progress is in amount of backend storage checked over time.
And no, the data is not sent over.  Why would you think so?

: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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