linux-kernel - Re: mdadm regression tests fail

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Message-ID: <96d9e6d4-16e5-6bfe-fc5a-7d0dfbaeadf0@youngman.org.uk>
Date:   Wed, 5 Jan 2022 17:44:34 +0000
From:   Wols Lists <antlists@...ngman.org.uk>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Bruce Dubbs <bruce.dubbs@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-raid@...r.kernel.org
Cc:     "Douglas R. Reno" <renodr2002@...il.com>,
        Pierre Labastie <pierre.labastie@...f.fr>
Subject: Re: mdadm regression tests fail

Bear in mind raid superblock v0.9 is deprecated as in "if it breaks it 
won't be fixed for you".

So I would skip this test, and if you're mentioning raid in the 
handbook, tell people they need to use one of the v1.x formats.

(NB - you can always point them at the linux raid wiki.)

Cheers,
Wol

On 05/01/2022 17:12, Randy Dunlap wrote:
> Hi.
> [adding linux-raid mailing list]
> 
> 
> On 1/4/22 10:55, Bruce Dubbs wrote:
>> I am trying to document the mdadm-4.2 installation procedures for our book,
>> https://www.linuxfromscratch.org/blfs/view/svn/postlfs/mdadm.html
>>
>> For testing, I am doing a simple:
>>
>>    make
>>    sudo ./test --keep-going --logdir=test-logs --save-logs
>>
>> But I get failures for about half the tests.
>>
>> Digging in a bit I just ran:
>>
>>   sudo ./test --tests=00raid0 --logdir=test-logs
>>
>> This is the first test that fails.  With some hacking, it appears that the first portion of this test that fails is:
>>
>>    mdadm -CR $md0 -e0.90 -l0 -n4 $dev0 $dev1 $dev2 $dev3
>>
>> This resolves to
>>
>>    mdadm -CR /dev/md0 -e0.90 -l0 -n4 /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop3
>>
>> There is not a lot of error output in the test, so I manually ran:
>>
>>    dd if=/dev/zero of=/tmp/mdtest0 count=20000 bs=1K
>>    losetup /dev/loop0 /tmp/mdtest0
>>
>> For /dev/loop[0123]
>>
>> Then I ran
>>
>>    mdadm -CR /dev/md0 -e0.90 -l0 -n4 /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop3
>>    mdadm: 0.90 metadata does not support layouts for RAID0
>>
>> My question is whether the regression tests in the tarball are valid for mdadm-4.2?
>>
>>    -- Bruce Dubbs
>>       linuxfromscratch.org
>>
>> Note: The kernel is version 5.15.12.
>