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[5.90.139.32]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-63a5235dccfsm18499428a12.9.2025.10.17.07.07.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Oct 2025 07:07:33 -0700 (PDT) Message-ID: <608328b7-9dfe-4edd-afd5-68366fb845bc@gmail.com> Date: Fri, 17 Oct 2025 16:07:31 +0200 Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Franco Martelli Subject: Unable to set group_thread_cnt using mdadm.conf To: linux-raid@vger.kernel.org Content-Language: en-US Autocrypt: addr=martellif67@gmail.com; keydata= xjMEXwx9ehYJKwYBBAHaRw8BAQdA8CkGKYFI/MK9U3RPhzE5H/ul7B6bHu/4BIhTf6LLO47N J0ZyYW5jbyBNYXJ0ZWxsaSA8bWFydGVsbGlmNjdAZ21haWwuY29tPsKWBBMWCAA+FiEET9sW 9yyU4uM6QbloXEn0O0LcklAFAmhyroACGwMFCQ0ncuYFCwkIBwIGFQoJCAsCBBYCAwECHgEC F4AACgkQXEn0O0LcklAHVwD9H5JZ52g292FD8w0x6meDD8y/6KkNpzuaLHP6/Oo8kAIBAJsh aMB9LdCBJTMtnxU8JTHtAoGOZ/59UJWeZIkuWJUNzjgEXwx9ehIKKwYBBAGXVQEFAQEHQNP5 V2q0H0oiJu89h1SSPgQDtkixXvUvRf1rNLLIcNpPAwEIB8J+BBgWCAAmFiEET9sW9yyU4uM6 QbloXEn0O0LcklAFAmhyroACGwwFCQ0ncuYACgkQXEn0O0LcklASVwEAoEkHMEU7mHc0zmAu D2R1PYsDh9+3wQeied5PrF+HdakBAOeSGsf40GBew5umZuM59I04d1uXYAXGMP+jGN2RUtMA Cc: xni@redhat.com, ncroxon@redhat.com, mtkaczyk@kernel.org Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hello, I've a RAID5 array on Debian 13: ~$ cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [linear] [raid0] [raid1] [raid10] md0 : active raid5 sda1[0] sdc1[2] sdd1[3](S) sdb1[1] 1953258496 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU] unused devices: ~# mdadm --version mdadm - v4.4 - 2024-11-07 - Debian 4.4-11 the issue is that I can't set group_thread_cnt if I use the syntax described in mdadm.conf(5) man-page: … SYSFS name=/dev/md/raid5 group_thread_cnt=4 sync_speed_max=1000000 SYSFS uuid=bead5eb6:31c17a27:da120ba2:7dfda40d group_thread_cnt=4 sync_speed_max=1000000 my "mdadm.conf" is: ~$ grep -v '^#' /etc/mdadm/mdadm.conf HOMEHOST MAILADDR root ARRAY /dev/md/0 metadata=1.2 UUID=8bdf78b9:4cad434c:3a30392d:8463c7e0 spares=1 SYSFS name=/dev/md/0 group_thread_cnt=8 SYSFS uuid=8bdf78b9:4cad434c:3a30392d:8463c7e0 sync_speed_max=1000000 after I makes changes to the file "mdadm.conf" I rebuild the initramfs image file and reboot. The thing that seems strange to me is that the other item I set (sync_speed_max) is changed accordingly, only "group_thread_cnt" fails to set (it's always ==0): ~$ cat /sys/block/md0/md/group_thread_cnt 0 ~$ cat /sys/block/md0/md/sync_speed_max 1000000 (system) Why "sync_speed_max" is set while "group_thread_cnt" it is not? Any clue? Thanks in advance, kind regards. -- Franco Martelli