[DRBD-user] strange checksum error

Csurai Akos akos.csurai at ericsson.com
Wed Aug 1 10:46:32 CEST 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 08/01/12 10:22, Felix Frank wrote:
> Hi,
> On 08/01/2012 10:02 AM, Csurai Akos wrote:
>> Those corrupted binary files has some 40 kbytes hole filled with zeros.
>> Yes it can be a HW issue, but we did not see it with C protocol
>> (which is deadly slow in our system unfortunately)
>> Have someone seen something similar ?
> no. Very strange, seeing as sync protocols should have nothing to do
> with it.
> Why is C slower than B in your setup?
:-\ As far as I understand our cluster uses special version of NFSV3 
client code
that works like a "latency test" from the drbd point of view:
write everything in small fractions and commit it instantly.

> Does your secondary have an
> inferior I/O stack? I'd advise to match the peers' hardware and switch
Yes, peers have the same HW.
> back to protocol C in that case. Otherwise, you should really try to
> find out what's making it slow, because it shouldn't be.
Agree, but it is to be ensured that C protocol really solve the symptom and
not just hide it or just reduce the probability of it.

> Cheers,
> Felix

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