[DRBD-user] verify-alg (does not) requires data-integrity-alg ?

Tom Brown tbrown at baremetal.com
Thu Apr 9 18:55:20 CEST 2009

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


>>
>> no. I didn't stomp while running the verify. I stomped and then ran it.
>> In fact I did it a couple times, as at first I wasn't stomping on much
>> data, later I zeroed out a 40 meg chunk, about 40 meg into the partition.
>>
>> (hhmm, sorry, looks like it was 4 Meg into the partion, .bash_history has
>> this...)
>>
>> dd if=/dev/zero of=/dev/vg1/nineteen-sys seek=1000 bs=4096 count=10240
>
> that may still have been in page cache if you ran the verify immediately
> after that. the verify reads directly from disk.

ugh. My bad. This appears to have been the explanation. Rerunning the test 
this morning with a "sync" added to the process finds the expected 
differences. Thank you for pointing out my error Lars.

-Tom



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