[DRBD-user] Warning: Data Corruption Issue Discovered in DRBD 8.4 and 9.0

Gandalf Corvotempesta gandalf.corvotempesta at gmail.com
Thu Oct 12 11:22:16 CEST 2017

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

Do you have any suggestions about software that will check for data
corruption by continuously stress a storage ? (Like creating files, read
them back, move around, renanes, deletes and so on)

Il 12 ott 2017 11:15 AM, "Robert Altnoeder" <robert.altnoeder at linbit.com>
ha scritto:

> On 10/11/2017 11:30 PM, Eric Robinson wrote:
> > The TrimTester program consists of three parts. The main executable
> > (TrimTester) just writes loads of data to the drive and tests for file
> > corruption. My C++ consultant says, "It writes sequential numbers
> > wrapped at 256, spanning multiple files. It checks previously written
> > files, and if the file data is all zeroes, it is considered to be
> > corrupted."
> Are you referring to this program?
> https://github.com/algolia/trimtester/blob/master/trimtester.cpp
> One thing that I can tell you right away is that this program does not
> appear to be very trustworthy, because it may malfunction due to the use
> of incorrect datatypes for the purpose - apparently, it is attempting to
> memory-map quite large files (~ 70 GiB) and check using a byte-indexed
> offset declared as type 'unsigned', which is commonly only 32 bits wide,
> and therefore inadequate for the byte-wise indexing of anything that is
> larger than 4 GiB.
> While this indicates that the program might miss actual corruption, so
> far I have not found any definitive proof that the program will generate
> false positives (however, I did not check the program in much detail,
> judging by the overall quality I would not be surprised if it did), so
> we should still continue investigating.
> I would certainly recommend to double-check by running some other
> software to check for data corruption issues to ensure that the problem
> is not malfunctioning test software.
> br,
> --
> Robert Altnoeder
> +43 1 817 82 92 0
> robert.altnoeder at linbit.com
> LINBIT | Keeping The Digital World Running
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