[DRBD-user] What causes nodes to become out-of-sync?

Jeffrey Froman drbd.tcijf at olympus.net
Tue Jul 22 18:34:31 CEST 2008

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


On Tuesday 22 July 2008 02:39:50 am Lars Ellenberg wrote:
> you are using 8.2.6, aren't you?
>
> which file system?

We are currently using drbd-8.2.5 under an ext3 filesystem, on 
CentOS-4.

> did you try to compare the reported blocks "by hand"?

I have not, but will do so the next time a verification failure is 
reported. Thanks for the recipe.

> do you use tcp checksum offloading?
> any other tcp offloading?

Not explicitly, but the nodes are connected via Gigabit NICs, so if I 
understand correctly, it's possible that checksumming is being 
offloaded to the NIC.
 
> did you try to enable "data-integrity-alg"?
> (go for crc32c, should be good enough)

Ah, will do. This looks like it will solve the problem if in fact it's 
the NICs that interfering.


Thanks for the excellent suggestions,

Jeffrey



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