[DRBD-user] drbdadm verify all seems to produce false positives on ext3 and crash the server

Eric Marin eric.marin at utc.fr
Tue Jun 24 09:14:54 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.

I first dismissed the possibility of faulty hardware because both 
servers were bought only a few months ago, but after this second crash, 
I'm getting worried. I'm going to test the RAM with MemTest86+ and see 
what I can do about the disks.

Both servers are Dell PowerEdge 1950 III with 4GB of Fully Buffered RAM, 
(which I think should correct small errors) and three SAS HDD in RAID 1 
(well, two in RAID 1 and one hot-spare) on a (real) hardware RAID card 
with 256MB of battery-backed cache (PERC 6i). Power supplies are 
redondant and hooked up to a filtered UPS.

Florian Haas wrote :
> Eric,
> have you considered the possibility that drbdadm verify is doing exactly
> what it's supposed to do, namely detect on-disk errors that may have
> been caused by hardware malfunction, driver bug, or RAM corruption?
> And yes, you may want to enable data-integrity-alg to see if you can
> catch that corruption, if it exists, in flight.
> Cheers,
> Florian
> Eric Marin wrote:
>> Hello and sorry about the length of this report,
>> [...]

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